Skip to main content
A Singapore Government Agency Website How to identify
Official website links end with .gov.sg
Government agencies communicate via .gov.sg websites (e.g. go.gov.sg/open). Trusted websites
Secure websites use HTTPS
Look for a lock () or https:// as an added precaution. Share sensitive information only on official, secure websites.

Welcome to our refreshed website!

We've updated the site to make information easier to access and navigate. While some content may have been reorganised, you can browse our updated sections to find what you need.

Urban Redevelopment Authority (URA)

Interior

Find out what you can change in the interior of your semi-detached house.

Last updated 6 June 2026

Attic

Isometric diagram of a cutaway house showing the attic floor level with an arrow pointing to it.

An attic floor is an incidental space underneath a main roof. It shall be confined within the permissible building envelope.

Roof terraces shall be located at least 3m below the top of the applicable building envelope line.

Mezzanine

3D cutaway view of a house, showing the 1st, 2nd, and attic floors, plus mezzanine level and yard.

Mezzanine floors are intermediate part floors located between two normal full floors. These shall be confined within the permissible building envelope.

There are no restrictions on the size of the mezzanine floor. The headroom for each mezzanine floor level shall provide good internal spatial quality for residential living.

Lift Shaft

Isometric architectural drawing of a house showing lift overrun.

Lift shaft shall be kept within the permissible building envelope.

Lift protrusions of up to 1.0m above the envelope control line may be allowed for lift overruns.