/4 min read/Updated
Setbacks and Envelope Control, Explained
In short
Landed housing here is controlled by an envelope rather than a plot ratio, so the maximum shape of the building is fixed by the plot before any design begins. This sets out URA's setbacks — from the road by the road's category, from side and rear boundaries, and the larger ones in Good Class Bungalow Areas — the height limits for two- and three-storey areas, and what an existing house with a short setback keeps through an A&A. The practical consequence is that massing is resolved before layout, and testing the envelope before purchase regularly changes the decision.
In this article
Topics
- Planning
- Regulations
Why envelope control changes how you design
With a plot ratio you decide how much to build and then where to put it. With an envelope you are given a shape and design inside it. The practical effect is that massing has to be resolved before layout, which is the reverse of how most people imagine the process.
URA's envelope control guidelines for landed housing took effect on 11 May 2015. They set a maximum height for the house by the area it sits in, and leave the arrangement of floors, mezzanines and attics inside that height to the design.
How high
| Landed housing area | Maximum building height |
|---|---|
| Two-storey area | 12 metres |
| Three-storey area | 15.5 metres |
An attic is not an extra storey under these rules; it is allowed within the same two- or three-storey envelope. Mezzanines are likewise designed within the overall height. Whether a plot is in a two- or three-storey area is set by URA's plans for the estate, and is one of the first things a feasibility study confirms.
Setbacks from the road
How far a house stands back from the road depends on the category of the road it fronts. The distances are measured from the road reserve line, which is not always where the kerb or the boundary wall is. These are URA's figures for bungalows, semi-detached and terrace houses.
| Road category | Main building | Of which green buffer | Car porch |
|---|---|---|---|
| Category 1 | 24 m | 5 m | Up to 5 m deep |
| Category 2 | 12 m | 5 m | Up to 5 m deep |
| Category 3, 4 and slip roads | 7.5 m | 3 m | 2.4 m |
| Category 5 | 7.5 m | None required | 2.4 m |
Most landed estates front smaller roads, which is why 7.5 metres is the number people remember. But a plot on a major road loses far more of its depth, and a listing rarely says which category the road is.
Setbacks from side and rear boundaries
| Where | Main building, car porch columns, terraces | Roof eaves |
|---|---|---|
| Outside a Good Class Bungalow Area | 2 m | 1 m |
| In, or for a terrace abutting, a Good Class Bungalow Area | 3 m | 1.6 m |
A terrace or semi-detached house is built to its party wall on one or both sides, so these apply to its other boundaries. Rear garden landed housing — a form with the garden behind rather than around the house — follows its own rule: 3 metres from the road, 2 metres at the sides, and 7.5 metres at the rear.
Corner plots and odd shapes
Corner plots front two roads and so carry a road setback on both, which costs depth but gives a second elevation to the street and, often, a better-lit plan. Existing irregular and odd-shaped plots have provisions of their own, which can relax a setback where the shape would otherwise make the plot hard to use.
An existing house with a short setback
Many older houses stand closer to the road than today's rules allow. An A&A works with the house as approved, but URA still asks for a minimum of 2.4 metres at the front where the existing setback is short. A rebuild, or an A&A that crosses into reconstruction, is drawn to today's setbacks in full — which on a deep, old house can mean losing floor area at the front. Before and After: What an A&A Can Actually Fix explains where that line falls.
Testing the envelope early
The single most useful thing that can be done in the first fortnight is to test what the envelope actually permits on that specific plot: its height control, the category of its road, its boundaries and its shape. Where this is done before purchase it regularly changes the decision. What a Feasibility Study Tells You covers the rest of what is checked.
The figures here are from URA's development control handbooks as they stand in October 2026. Guidelines change, and a qualified person confirms the ones that apply to a particular plot before a design is fixed to them.
Key takeaways
- Envelope control fixes the maximum shape before design starts.
- Outside GCBAs: 2 m from side and rear boundaries. In GCBAs: 3 m.
- From the road: 7.5 m on Category 3 to 5 roads, 12 m on Category 2, 24 m on Category 1.
- Height: 12 m in a two-storey area, 15.5 m in a three-storey area.
- Testing the envelope before purchase regularly changes the purchase decision.
On this site
First published in the KAPA Journal, written with KAPA Design Collective, the practice that designs and builds our residences.
Published by TMB Development at tmbdevelopment.com/journal/setbacks-and-envelope-control. Quoting a passage with a link back is welcome; republishing it is not — see the terms.
