Bungalow rear extension

Rear extensions for bungalows

A bungalow rear extension adds living space, a bedroom or an accessible bathroom without stairs. Because the roof of the extension meets a low eaves line, the design work is in the roof: matching the pitch, keeping head height and bringing in daylight through roof windows.

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Bungalow with a pitched-roof rear extension, two roof windows and grey French doors onto a patio

Why extend a bungalow at the back?

It keeps the home on one level, which is why many owners extend rather than move as they plan for later life. Typical projects are an open-plan kitchen-living room, a ground-floor bedroom with an en-suite, or a wet room with level access.

How much does a bungalow rear extension cost?

Allow £1,850–£3,000 per square metre including VAT for a standard specification. A 3 m × 4 m extension typically comes to £22,000–£36,000, and 4 m × 6 m to £44,500–£72,000.

Do you need planning permission?

In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part is within 2 metres of a boundary.

Different rules in Wales, Scotland and Northern Ireland. The limits above are for England. Check your own house with our depth checker or read how far you can extend without planning.

What is included?

Roof design matched to the bungalow
Level thresholds and wide doorways
Accessible bathroom or wet room options
Roof windows for daylight
Insulation upgrade where the roofs meet
Heating extended into the new room
Planning or permitted development check
Building control sign-off

Guide prices by region

Per square metre of new floor, including VAT, standard specification.

Region	Per m² inc VAT
London	£2,400–£3,900
South East England	£2,070–£3,360
East of England	£1,960–£3,180
South West England	£1,920–£3,120
West Midlands	£1,850–£3,000
East Midlands	£1,790–£2,910
North West England	£1,740–£2,820
Yorkshire and the Humber	£1,720–£2,790
North East England	£1,660–£2,700
Wales	£1,720–£2,790
Scotland	£1,760–£2,850
Northern Ireland	£1,610–£2,610

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FAQ

Bungalow rear extension questions

Can a bungalow extension be fully accessible?

Yes: level thresholds, wider doors and a wet room are straightforward to design in.

Will the roof look odd?

Not if the pitch and tiles match. Where the eaves are low, a flat-roofed section with a lantern is an alternative.

Can I extend the loft as well?

Sometimes, but that is a different project; a rear extension keeps everything on one level.

How deep can I extend?

The same limits as a house: 3 or 4 metres in England, more with prior approval.

Do I need to move out?

Rarely; the opening into the bungalow is made late in the build.

Is a bungalow extension cheaper?

The rates are similar per square metre; roof work can add a little.

Where