Additions and Alterations

Find out more about the application process and guidelines for making additions and alterations to conserved buildings.
You are required to get Conservation Permission if you are carrying out conservation works and additions & alterations (A&A) to a building within a conservation area. This process is dependent on whether the works require a submission of plans to the Building and Construction Authority (BCA) for approval.

This refer to proposals that affect the key elements of conserved buildings. They have a significant impact on the architectural character and spatial integrity of conserved buildings. The submission must be made by a Qualified Person (QP) who is a Registered Architect. The works include, but are not limited to:


Restoration of roof profile, pitch or height

Addition, removal or change in size or location of jack roof or skylight

Addition or removal of reinforced concrete structures on existing flat roof

Front & Side Facade Restoration of architectural elements such as windows, doors and original decorative features
Gable End Wall, Rear Facade & Rear Service Block

Restoration of architectural elements such as windows, doors and original  decorative features

Addition or removal of window or door

Upper Storey Floor

Change of entire floor using similar or different material

Addition or removal of:

  • void
  • roof mezzanine

Addition of new rear extension

Structural strengthening work

This refer to proposals that affect the key elements of conserved buildings to a lesser extent. They have some impact on the architectural character and spatial integrity of conserved buildings. The submission must be made by a Qualified Person (QP) who can be a Registered Architect or a Professional Engineer. The works include, but are not limited to:


Replacement of roof tiles

Addition of pergola or shelter with non-load bearing cover on flat roof


Addition or removal of window, inclusive of transom above a window

Addition of cover over airwell
Rear Court

Restoration of architectural elements such as windows, doors and original decorative features

Addition or removal of roof over rear court

Party Wall

Addition or sealing of opening in party wall

Staircase & Lift

Addition or removal of

  • internal staircase
  • lift

This refers to works carried out on any conserved building that are minimal and localised and/or for the purpose of repair and maintenance. The submission do not need to be made by a Qualified Person, it can be made by owners and contractors. The works include, but are not limited to:


One-for-one localised replacement and/or repair of roof tiles and rafters


Change in design and infill material for jackroof opening

Front, Side & Rear Facade, Gable End Wall & Rear Service Block

One-for-one replacement or repair of door or window, transoms and vents

Localised repair of decorative features

Addition, repositioning or change in material, design or size of vents

Addition, replacement or removal of secondary door or window

Addition or removal of security grilles

Addition or removal of canopy above window

Addition or removal of tiled canopy or retractable awning

For commercial buildings with residential front control:

  • Replacement of 1st storey window with door and vice versa


  • Change in infill panel(s) of 1st storey door or window from timber to glass and vice versa

For buildings without residential front control:

  • Change in shopfront design
Five-Foot Way

Change of flooring material at five-foot way 

Addition or removal of ramps or steps 

Change in level of five-foot way

Upper Storey Floor

One-for-one replacement of timber floor boards and joists

 Party Wall Sealing up of party wall opening
 Mechanical & Electrical Services

Addition, repositioning or change in material or design of flue

Addition or repositioning of air-conditioning units and screening

Addition of solar panels and/or solar heater on existing roof

 Building Colours

Painting of building facades

Painting of mural

 Signage  Addition or repositioning of business signs

You will need to submit the following:

i) Letter of Owner's Authorisation 

ii) Proposal for Repair and Maintenance works using either: 
             • Colour photo in “JPEG” format; or 
             • Floor plans/elevations drawn to scale.

You can expect a reply within 10 working days. If the proposal is in order, we will issue a Conservation Permission for the works.

After the works are carried out, you will need to submit photographs of the completed works to us using the Apply for Category 3 Works for Conserved Buildings e-Service. If the works are in order, we will issue a Letter for Endorsement of Completed Works. No works should be carried out before Conservation Permission is issued.

Submit your application electronically through CORENET, you can expect a decision within 20 working days.

Your registered architect will consult the relevant technical departments before submitting plans for the proposed works.

Your registered architect should submit plans for Conservation Permission after receiving structural input from a professional engineer. The architect should also submit a detailed structural investigation report (including pictures of the building’s exteriors and interiors), method statement and protection plan, that is prepared and endorsed by the engineer.

Submission Requirements

The submission requirements for development control are applicable for conserved buildings.

For Conserved Buildings, please also include the following in your submission:

  • 1 set of Measured Survey Drawings with registered Surveyor's endorsement
  • 1 set of Structural Report from Professional Engineer
  • 1 set of Calculation Plans
  • Photographs of the existing front, rear, side (if any), elevation and roof

Step-by-step Guide on Development Application via CORENET

We will issue the Conservation Permission to you.

Your architect should submit building plans to BCA and obtain Building Plan clearance from relevant technical departments. The architect should also obtain Building Plan approval from BCA. After which, you will receive from the BCA the permit to begin works.

For works that do not require BCA’s approval, click here.

Interim site inspections may be carried out by URA when necessary.

You should inform us when the works are completed so that you can obtain TOP/CSC Clearance.

Please submit an application to request for TOP/CSC site inspection of the conserved buildings electronically through CORENET.

TOP/CSC Clearance can only be granted if the building works are completed according to the Approved Plans.

Your application fee varies depending on the gross floor area, site area, application type and development type of your proposal. 

Click to view fees for development application.

Deviation from Conservation Guidelines Civil Penalty Fees to be Imposed
(as multiple of Processing Fee)
 Without Enforcement Record With Enforcement Record
Incompliance or Minor Deviations  2x 4x 
Major Deviations  25x 50x 

Development charge is the tax on the enhancement in land value resulting from the State approving a higher value development proposal.

A development charge, where applicable, will also be imposed on all new extensions and new floor areas, for example, roof mezzanines within the envelope of the conserved building.

However, you may be exempted from paying the development charge if:

The value of the development has been enhanced due to proposed use or use changes on the gross floor area for the conserved building or part thereof provided that the restoration work is carried out according to the approved plans and completed within a two year period from the date of Conservation Permission.

A car parking deficiency charge is payable by the developer if they are unable to provide the number of car park lots that are required by planning as part of their development.

All new extensions to conserved buildings are required to provide car parking spaces under the Parking Places Rules.

The car park deficiency charge for a conserved building is waived if:

  • Conservation guidelines are fully complied with
  • Conservation works are completed according to the approved plans