Planning Parameters and Restoration Guidelines for Residential Historic Districts

The use shall follow the Master Plan intention for the respective areas which are predominantly for residential use. The exceptions are as follows:

The allowable plot ratio shall be the resultant of the building envelope.

The original building height is to be retained.

The original building profile is to be retained. If it has undergone unauthorized alteration, the original profile is to be reinstated.

The predominant use in these areas is residential. In view of the restriction on use, all units can have extension at the rear of the main conserved building(s). The rear extension is to be lower than the main roof and not to exceed the allowable number of storeys for landed housing development i.e. 3 storeys.  For sites which have 2 main buildings and an airwell in between them to be conserved, the new extension is to be located beyond the 2 main buildings. 

See Figure 1 [PDF, 914 KB] 

Land Betterment Charge (LBC) may be payable in respect of any development of the land or when there is a value enhancement arising from the proposed use or use changes on the building or part thereof on the land. More information on LBC is available on SLA's website. Taxable persons may elect to use the Valuation method in lieu of the Table of Rates method, by using a prescribed form at the above web link.

Exemption from payment of LBC, if applicable, is given in respect of the value enhancement arising from the proposed use or use changes on the gross floor area for the building or part thereof on the land to be conserved provided that such conservation is carried out in accordance with the approved plans and completed within a period of 2 years from the date of conservation permission.

Provision of car parks or payment of car parks deficiency charge for a conserved building is waived if the conservation guidelines are fully complied with and the conservation works are completed in accordance with the approved plans.

The majority of conserved shophouses have a pitched clay tile roof supported by timber roof structure.

Structural strengthening or supports like steel or reinforced concrete roof beams, if required to be added, are to be sensitively designed to minimise visual impact on the traditional timber system which is to be retained.

The original profile, pitch, height, party wall and eaves projection is to be retained and restored.

The traditional roofing materials provide contrast to the form, scale and texture of the cityscape. It is important that the authenticity of materials, form and construction be retained during restoration.

Traditional roofing material of small size, V-profile, unglazed, natural colour clay roof tile is to be used. Flat, interlocking (“Marseilles”) clay roof tile and reinforced concrete can only be used if these materials were originally used for the roof.

The underside of roof eaves can be exposed or covered with plasterboard.

For units with existing ornamental roof ridge, the ridge profile and ornamentation is to be kept. New jackroof is not allowed for such units. To refer to “Specific Restoration Guidelines” of the subject building.

Existing jackroof, if any, can be retained or removed.

New jackroof can be added subject to compliance with the positioning, setbacks and maximum allowable dimensions.

See Figure 2 [PDF, 956 KB]

Roof tiles and pitch of the jackroof are to be identical to that of the main roof. Sidewall is to be finished with plaster or timber/plasterboard or glazed panels.

Front and rear openings can be fixed or openable of any infill material. If metal is used, it is to be anodised or colour coated.

New skylight can be added on the rear slope of the main pitched roof, on secondary pitched roof and on the rear slope of new jackroof. Skylight on the jackroof is to be located beyond the first quarter of the rear slope of the jackroof to keep the character of a typical jackroof.

See Figure 2 [PDF, 956 KB]

The skylight is to be on the same plane as the subject roof and the total area of the skylight cannot exceed 30% of the subject slope of the pitched roof. The protrusion of the skylight should not exceed 150mm beyond the roof tiles.

New skylight can also be added on a conserved building with flat roof. While the design, treatment and materials used can vary, the height cannot exceed 1m, which is the typical roof parapet height, so that the skylight is not visible from the street level. The skylight area is to be computed as part of the 35% coverage allowable for new single storey structure on the flat roof.

(See item A6)

The skylight is to be of transparent or translucent material on framework of timber or metal - painted or anodised or colour coated. The design, treatment and material used can vary. It can consist of glass louvers, retractable panels or even solar panels laid on the same plane as the roof. For solar panels, the metal supporting structure is to be painted, anodised or colour coated.

To minimise disruption to the roofscape, the skylight cannot be an opening or void without cover and is to be set back from the roof eaves and roof ridge.

Dormer window is not allowed.

Some conserved shophouses, particularly those of the Art Deco or Modern style, may have reinforced concrete flat roofs. Existing flat roof can be landscaped to add interest to the roofscape. New structures can be added on the existing flat roof, subject to the following guidelines:

(a) Material, Roof Form & Storey Height

The structure can be of reinforced concrete or lightweight material with flat roof and single-storey in height not exceeding 3600mm. A higher height arising from agencies' requirements can be considered for lift shafts. The design and treatment are to be compatible with the architecture of the conserved building.

(b) Coverage

The total coverage of all existing and new structures on the flat roof, including skylights but excluding solar panels and moveable covers e.g. umbrella structures and retractable awnings, cannot exceed 35% of the flat roof area of the unit. All service installations on the roof are to be grouped together and included in the 35% allowable coverage for structure on flat roof.

(c) Setback

The new structure is to be set back a minimum of 3m from the front and side street elevations so that it is not visually obvious from the street. Setback is not required from party wall and backlane.

If the subject unit is higher than the neighbours, setback of the new structure from the common boundary with the neighbouring units is required.

If the subject unit is not higher than the neighbours, setback of the new structure from the common boundary with the neighbouring units is not required.

See Figure 3 [PDF, 800 KB]

(d) Railings

To meet technical agencies’ requirements, railings of compatible design and material set back a minimum of 1m from the front façade can be added.

(e) Security Fence

For security and privacy between common boundaries, a metal security fence (anodised / colour coated) or timber screen up to 1800mm from the finished floor level can be added.

For forecourt with special features such as gateposts and ornamental forecourt wall, the original size and ornamentation of the wall and gateposts are to be retained and restored. To refer to ‘Specific Restoration Guidelines’ of the subject building.

For forecourts with modular features, some modification can be considered for widening of the entrance in order to facilitate carparking within the premise. This is subject to evaluation.

For forecourts with no special features and to facilitate carparking provision within the residential development, the entrance can be widened to a maximum of 3m and the forecourt lowered to be at-grade with the road.

Retention of the original forecourt gate is encouraged. If replaced, the forecourt gate is to be of a compatible design. The open spatial character of the forecourt is to be retained.

For the terrace houses along 128 to 128H Cairnhill Road, the raised forecourts cannot be lowered. The existing blank walls fronting the street can be modified for garages to be added under the forecourts.

Changes to existing shopfronts are allowed except for existing shopfronts which still have traditional transom panels, vents, decorative mouldings or murals. Such traditional features are to be retained. Fixed frameless glass panels can be added behind the vents, if required. To refer to “Specific Restoration Guidelines” of the respective building.

A shopfront must not be a blank wall which gives a passive character to the streetscape.

Some first storey frontages have doors which lead to the upper storey. If the doors have to swing out to meet fire escape requirements, they should be recessed so that for pedestrian safety, they do not swing open into the five-foot way.

Residential Fronts are characterised by timber casement windows flanking a double-leafed timber door. All buildings with residential front which is existing and/or identified in the ‘Specific Restoration Guidelines’, regardless of land use zoning, shall be retained and restored.

The following may be considered for a conserved building located on a site zoned for full Commercial use.

(a) The original 2 windows and 1 door first storey residential front can be changed to 2 doors and 1 window if the new door is required for direct access to the upper storey. The design and material of the new door are to match those of the original one. However, if there are ornamental features e.g. dado tiles below the windows, these are to be retained and the conversion of the window to a door is not allowed.

(b) If the original infill panel of the first storey casement windows and doors are plain without any design features, they can be replaced with clear glass. However, if the infill panels are carved with decorations, they are to be retained and cannot be replaced with clear glass. To refer to ‘Specific Restoration Guidelines’ of the subject building.

(c) Alternatively, fixed frameless or timber framed glazed panels can be added instead of secondary windows, and frameless glass doors can be added as secondary doors while the original timber windows and doors are retained and restored. This gives owners another option to keep the original architecture of the conserved building while achieving greater transparency and climatic control of the internal space.

See Figure 4 [PDF, 1.7 MB]

If the doors have to swing out to meet fire escape requirements, proposals to recess the doors may be considered subject to evaluation, so that for pedestrian safety, they do not swing open into the five-foot way. 

For units with residential front, existing traditional window screen, if any, is to be retained. To refer to ‘Specific Restoration Guidelines’ of the subject building.

New window screen can be added and the design is to be traditional. The frame is to be timber and the infill may be timber or obscure glass.

Metal security bars at windows and timber security gates at doors, if any, can be retained or removed. Similar new security bars and gates of traditional design and material can be added.

For units with residential front, the existing pintu pagar, if any, is to be retained. To refer to ‘Specific Restoration Guidelines’ of the subject building. New pintu pagar can be added and the design is to be traditional. The frame is to be timber and the infill is to be of traditional materials i.e. timber and obscure glass.

The following guidelines are applicable to a conserved building with dado tiles:

(a) If the tiles are intact, the original tile panel is to be retained.

(b) If there are cracked or missing tiles,

(i) Replace the missing tiles with tiles matching the original tiles,

(ii) Leave the tile panel as it is, or

(iii) Patch the gaps with colour cement to match the colour of the tiles.

The doors, windows and vents in conservation buildings give the façade a sense of scale and added architectural expression. The original fanlights, windows, doors, vents, balconies and verandahs are to be retained and restored. To refer to ‘Specific Restoration Guidelines’ of the subject building.

The balcony or verandah is to be kept open and not enclosed with window or fixed glazing. The inner facade behind the balcony or verandah is also to be retained and restored. The windows of the inner façade can be changed to doors for better access to the balcony or verandah. The design and material of the new door are to match those of the original one.

New internal elements such as staircase landing, walls, partitions and false ceilings cannot abut the original windows, doors and vents. If any new internal element is added near to such features, it is to be sufficiently set back so that the original architectural elements can still be appreciated. False ceilings are to be above the top of any key features, such as existing vents, transoms and ceiling-level cornices. 

Existing mild steel frames of doors, windows and vents can be changed to powder coated aluminium frames of similar appearance as the mild steel frames.

Existing coloured glass in doors, windows, fanlights and vents cannot be replaced with clear glass.

The original balustrade for French window is to be retained and restored. Any proposal for modification arising from agencies' technical requirements should be submitted for evaluation. To refer to ‘Specific Restoration Guidelines’ of the subject building.

Most shophouses have air-conditioning to meet modern standards of comfort and user requirements. A secondary layer can be introduced to accommodate this change. New secondary casement, French or sliding window and door can be added subject to the design being compatible with those of the main window and door.

For conserved buildings with timber windows / doors, owners are encouraged to use timber frames as they are more compatible. If metal frame is used, it is to be anodised or colour coated. The infill can be of timber or glass. Tinted, coloured and obscure glass can be used. Frameless glass secondary doors can be used.

Frameless fixed glass panels can be installed at the first storey windows. However, they cannot be used in place of secondary windows on the upper storeys of a conserved building as they will lead to difficulty in accessing and maintaining the original windows.

Traditional bat-shaped, circular or precast vents can be sealed with glass.

See Figure 5 [PDF, 948 KB]

The shophouse façade may feature decorative work such as ornamental plasterwork, faux tile render and cut-porcelain tile decorations. The original decorative features, if any, are to be retained and restored. To refer to ‘Specific Restoration Guidelines’ of the subject building.

Original tile canopy, if any, is to be retained and restored. To refer to ‘Specific Restoration Guidelines’ of the subject building.

New tile canopy can be added at 2nd storey floor level. Traditional roofing material of small size, V-profile, unglazed, natural colour clay tiles identical to those of the main roof or green glazed Chinese clay tiles can be used.

See Figure 6 [PDF, 1 MB]

Retractable awning can be added at 2nd storey floor level. It is to be sensitively installed under or at the main beam, and not cover or block any key architectural features.

See Figure 7 [PDF, 789 KB]

They are subject to relevant technical agency’s requirements, e.g. Singapore Land Authority (SLA), Land Transport Authority (LTA), Fire Safety and Shelter Department (FSSD).

(a) Paint & Plaster finish

Shophouses were originally rendered in lime plaster and painted with lime wash. In replastering or repainting historic buildings, lime plaster and lime wash or its modern day equivalents e.g. mineral paint, should be used. This is because historic brick tends to be porous and lime plaster and lime wash allows moisture to evaporate from the walls. Cement plaster and film-forming paint should not be used because they cannot perform this function and could eventually create moisture-related deterioration. 

Spray-applied textured wall coatings are not allowed. 

(b) Timber Surfaces

Timber surfaces can be either painted or stained.

(c) Shanghai Plaster Finish

For a building with existing unpainted Shanghai plaster finish, the finish is to be retained and restored.

If the Shanghai plaster finish is already painted over, the owner is to look into recovering the original Shanghai plaster finish.

(d) Fair-faced Brickwalls

For a building with existing unpainted fair-faced brickwalls, the fair-faced brickwalls are to be retained and restored.

If the fair-faced brickwalls are already painted over, the owner is to look into recovering the original fair-faced finish.

If the brick is soft and flaky, a materials specialist should be engaged to advise on appropriate treatment such as use of consolidant and/ or water-repellent finishes which are clear, colourless and breatheable (e.g. silane-siloxane-based products). 

Traditional paint schemes and colours are to be used to recall the historic streetscape. Generally the base colour of shophouses has a pastel hue. Where necessary, darker or lighter shades can be used to highlight selected features or decorative ornamentations. Black should not be used as a base colour as this hides the architectural features.

A paint scraping analysis can be carried out to determine the original colour of the building. Original traditional painted murals and cut-tile decorations arenot to be removed or painted over.

For Emerald Hill Conservation Area, a special pastelcolour paint scheme has been developed together with the Emerald Hill Conservation Association (EHCA). Please email ura_cu@ura.gov.sg for more information.

A unique adaption to the hot and wet climate, the five-foot way is a continuous colonnaded covered walkway along the front and sometimes the sides of a shophouse block.

Some five-foot ways have original granite slab borders and/ or edging. If such original granite slabs are existing, they shall be retained and restored. 

The retention or reintroduction of the traditional materials and finishes of the five-foot way is encouraged. Traditional materials and finishes of the five-footway contribute to the overall character of the conservation area. They include cement screed, terracotta tiles, clay tiles, cement terrazzo, mosaic, or marble chip terrazzo.

Owners are strongly encouraged to keep the original floor finish, if existing. Where the existing floor finishes are not original, owners are strongly encouraged to reintroduce traditional floor finishes. The selection of the floor finishes should preferably match the architectural style of the shophouses. The tiling material is to be non-slip for the safety of pedestrians. Highly polished gloss finish is not allowed.

The level of the five-foot way is to match the adjacent units and open walkway where possible. Where the difference in level is not more than 175mm, a ramp is to be provided. The gradient of the ramp cannot be steeper than 1:10.

As shophouses are typically under different ownership and restored at different times, an owner has the following options:

(a)     Liaise with neighbours to level the ramp.

(b)     Provide gradual ramps.

(c)     Keep the existing step if the adjacent units are not restored.

Where there is significant level difference between the five-foot way and open walkway, safety railings can be considered subject to evaluation of its design. The design should be simple, porous and lightweight. 

See Figure 8 [PDF, 871 KB]

The design and placement of letter boxes along the five-foot way is to take into account pedestrian safety. They can be integrated into the design of the shop front or residential front.

Exposed upper floor structure of timber boards and timber joists is preferred. Existing exposed reinforced concrete floor above, if any, can remain.

False ceiling of timber frame and plaster /timber board, not lower than the front facade beam, can be added.

Variations in design and use of alternative compatible material can also be added at the main entrance.

For shophouses which abut a public road or lane, existing openings such as casement windows, doors and vents, if any, in the end gable wall can be retained or sealed up.

New openings, casement windows, doors and vents can be added subject to retention of the solid and void expression of the end gable wall, i.e. the wall space between the windows should have a minimum dimension equal to the new window opening width. They should align with the existing windows, if any, and the proportion is to follow the existing.

The design and material of the new windows and doors are to match the original windows at the end gable wall, or those of the front facade upper storey windows. To refer to ‘Specific Restoration Guidelines’ of the subject building for the front façade windows.

Vents can be of any material. If metal is used, it is to be anodised or colour coated.

See Figure 9 [PDF, 1.2 MB]

New internal elements such as staircase landing, wall and partition cannot abut the window or door openings and vents, and are to be sufficiently setback.

No openings are allowed for gable walls which share a common boundary with a neighbouring property.

New canopies over doors and windows with a projection of not more than 450mm can be added. The frame is to be timber and the roof material, similar to that of the main roof.

See Figure 9 [PDF, 1.2 MB]

They are subject to relevant technical agency’s requirements, e.g. Singapore Land Authority (SLA), Land Transport Authority (LTA), Fire Safety and Shelter Department (FSSD).

If the existing rear court is kept, the original windows can be retained and restored, or replaced with new French or casement windows. The frames are to be timber and the infill can be timber or glass.

See Figure 10 [PDF, 716 KB] 

New internal elements such as staircase landing, wall and partition cannot abut the window openings and vents, and are to be sufficiently setback.

Existing vents, if any, can be retained or removed. New vents of any material can be added. If metal is used, it is to be anodised or colour coated.

New canopies over doors and windows with a projection of not more than 450mm, can be added.

The frame is to be timber and the roof material similar to that of the main roof.

If the existing rear service block is kept, existing windows and openings, if any, can be retained and restored. New casement windows with or without brickwall between windows can be added. The frames are to be timber and the infill can be timber or glass. Existing openings can also be infilled with grilles.

See Figure 11 [PDF, 857 KB]

New internal elements such as staircase landing, wall and partition cannot abut the window or door openings and vents, and are to be sufficiently setback.

Existing vents, if any, can be retained or removed.

New vents of any material can be added. If metal is used, it is to be anodised or colour coated.

New canopies over doors and windows with a projection of not more than 450mm can be added.

The frame is to be timber and the roof material similar to that of the main roof.

A new roof can be added over the rear court, provided the roof is not higher than the 2nd storey floor level.

The new roof can be in reinforced concrete, light weight material or same roof material as the main roof. If metal is used, it is to be anodised or colour coated.

Reinforced concrete flat roof can be used as a roof garden. The rear boundary wall can be raised up to the sill height of the 2nd storey windows to form a parapet, not exceeding 1m in height. The space along the parapet can be used to house condensing units. Any screening above is to be kept minimal in height and is to be effective screening in the form of simple grilles or louvers. If metal is used, it should be anodised or colour-coated.

If condensing units are taller than the 1m parapet height, the level of the RC flat roof on which the condensing units are housed is to be lowered such that the height of the condensing units does not exceed the parapet wall or 1m above the 2nd storey level.

See Figure 12 [PDF, 732 KB] 

External staircases within rear courts are distinctive architectural features of the conserved buildings. Owners are encouraged to keep the existing external staircase so as to contribute to the charm and character of the area. However, existing external staircase, if any, can be retained or removed and new external staircase of any material can be added. If metal is used, it is to be anodised or colour coated.

If a new external secondary staircase in addition to the internal primary staircase is required to meet SCDF’s fire safety regulations, the location, design and material are subject to evaluation.

The original height of the wall is to be retained, except

(a)     when the rear court is to be roofed over and the wall has to be raised up to the 2nd storey floor level to give sufficient headroom, and

(b)     if it is required to meet the minimum parapet height for roof terrace over the rear court or for screening of condensing units (refer to item H1).

See Figure 10 [PDF, 716 KB] 

At upper storeys, new vents and casement windows can be added.

At the 1st storey, only vents and high-level windows can be added.

Vents can be of any material. If metal is used, it is to be anodised or colour coated. Casement and high level windows are to be timber frame and the infill can be timber/ glass.

New internal elements such as staircase landing, wall and partition cannot abut the window openings and vents.

Existing door position can be retained or changed. The doorway can be enlarged subject to a width of not more than 1800mm.

Timber or metal can be used. If metal is used, it is to be anodised or colour coated.

New canopies over doors and windows with a projection of not more than 450mm can be added.

The frame is to be timber and the roof material, similar to that of the main roof.

They are subject to relevant technical agency’s requirements, e.g. Singapore Land Authority, Land Transport Authority, Fire Safety and Shelter Department.

The original size and location is to be retained and restored.

A new roof can be added over the airwell, provided the roof is lower than the eave of the main roof. No other above ground structure, lift or floor is to be added within the airwell space.

Light weight transparent or translucent roof covering is to be used. If metal framework is used, it is to be anodised or colour coated. The cover can be retractable or fixed.

See Figure 13 [PDF, 1.1 MB] 

The original windows are to be retained and restored. New casement /French windows can be added subject to the design and material matching those of the front facade upper storey windows. To refer to ‘Specific Restoration Guidelines’ of the subject building.

New internal elements such as staircase landing, wall and partition cannot abut the original window openings and vents.

Original decorative or ornamental features, if any, at the airwell are to be retained and restored.

The existing windows/openings in only one of the three sides of the airwell, excluding the existing party wall, can be fully walled up.

The majority of conserved buildings have timber floor boards on timber structure. The structure consists of the timber joists which span between the party walls. The timber floor boards are then laid horizontally on the joists and are usually joined by the tongue and groove method. Being one of the key architectural elements which contributes to the internal spatial quality and original character of the shophouse, it is important that the timber floor should be retained.

Horizontal and/or vertical structural supports, if required to be added, are to abut the party walls to minimise impact on the existing structural system which is to be retained.

For original reinforced concrete framed buildings, the original structural grids are to be retained. New columns, if required to be added, are to align with and respect the original grids.

Provided the structural integrity of the building is not compromised, flexibility to shift some columns to meet the specific operational/ functional requirements can be considered on a need-to basis.

The existing level, timber floor and structural system is to be retained and restored. If the original shophouse has reinforced concrete floors, the reinforced concrete floors can be retained.

Voids up to 25% of the floor area of each floor of the unit, can be introduced.

If the original shophouse has timber floors, localised areas can be changed to reinforced concrete floor for wet areas such as toilets and kitchen. An alternative solution is to add a composite floor above the existing timber floor for such wet areas. If subsequent works are carried out where the wet areas are no longer required, the timber floor is to be reinstated.

The existing floor level can be raised to meet minimum platform level required by the relevant technical agency.

Part of the existing level can be lowered by not more than 600mm for landscaping/ ponds/lift pits.

New basement is not allowed.

Party walls are principal load-bearing walls. They are either constructed of brickwork or of column-and-beam construction with non-structural infill walls. The load bearing walls are supported on continuous strip foundation whilst columns rest on brick footings.

Horizontal and/or vertical structural supports, if required to be added, are to abut the party walls to minimise impact on the existing structural system which is to be retained.

The first 3-metre length of the load-bearing party wall perpendicular to the 1st storey shopfront is to be retained to keep the fine-grained character of the shophouses. Slight reductions or variations within the first 3m can be considered on a need-to basis.

Openings in the load-bearing party walls can be introduced provided the total width of the openings is less than 50% of the total length of the party wall within the building envelope.

For original reinforced concrete framed buildings, there is no control on party wall openings and the first 3-metre length of the party wall perpendicular to the 1st storey shopfront need not be retained.

Typically, the false ceiling is at or above the springing line. If the ceiling is lowered below the springing line, it is to be setback 1500mm or 2500mm following the roof mezzanine guidelines [refer to Item N(a) and (b)].

Exposed upper floor structure of timber boards and timber joists is preferred.

If required, new false ceilings not lower than the original window openings or transom/fanlight/vents can be added.

Only either pitched or flat roof is allowed. Part-pitch part-flat roof is not allowed.

If a pitched tile roof is proposed, it can be higher than the eaves of the main conserved building but lower than the ridge of the main roof. The roof tiles and pitch are to be the same as those of the main roof.

If a flat roof is proposed, it is to be lower than the eaves of the main conserved building. The new roof can be of any material. If metal is used, it is to be anodised or colour coated.

On the flat roof of the new extension, any protruding structures above the flat roof should be for services only, for example, stair core, lift shaft, or air-conditioning units. In addition, small, lightweight, open-sided shelters or canopies may be considered subject to evaluation. 

The height of new rear extension shall be interpreted as the total height inclusive of the jackroof, if any. Thus, the secondary jackroof shall not be higher than the ridge of the main roof, even if the main roof has a jackroof.

See Figure 15 [PDF, 957 KB]

Rear extensions are to be sensitively designed. For units with rear extensions in highly visible locations, e.g. where side and rear elevation faces main roads, key vistas and public spaces, a Design Statement of Intent (DSI) will be required to be submitted. These units are as shown in these plans [PDF, 2.5 MB] as well as URA Space. The proposal may be subject to further review.

The template for the DSI can be downloaded here [DOCX, 26 KB]. Exact copy of adjacent conserved buildings would not be allowed.

Design and material can vary.

Canopies, if any, are to have projection of not more than 450mm.

If the rear boundary wall abuts the adjacent lot boundary i.e. without a backlane, the rear boundary wall height is to be retained and a minimum rear setback of 3m is to be provided for the extension. 

Additional floors of any material can be constructed over the entire rear space. The new rear extension cannot exceed the allowable number of storeys for landed housing development i.e. 3 storeys.

The new floor levels need not be the same as the original floor levels. 

New basement is not allowed.