Horsham, West Sussex
Bungalow rear extension in Horsham
For homes in Horsham, a bungalow rear extension is often the simplest way to gain space without moving. Single-storey rear extensions that keep everything on one level. We take it from survey to completion certificate.
Horsham and its postcode districts RH12 are part of our West Sussex coverage. For Horsham bungalows we design the roof first, because the low eaves decide the height of the new room.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a bungalow rear extension cost in Horsham?
In Horsham, our guide for a bungalow rear extension is £2,070–£3,360 per square metre including VAT for a standard specification. South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £25,000–£40,500 |
| 4 m wide × 6 m deep (24 m²) | £49,500–£80,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a bungalow rear extension in Horsham?
Planning for a bungalow rear extension in Horsham follows the English householder rules.
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.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Horsham like to extend?
Horsham has a mix of Victorian terraces near the centre and larger Edwardian and inter-war houses further out. Clay soils across much of the South East mean deeper foundations near trees, which we plan for at the survey.
How a bungalow rear extension in Horsham comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Bungalow rear extensions near Horsham
Close by, we work in Broadfield, about 5.8 miles away, and Crawley, about 7.2 miles away.
- Bungalow rear extension in Broadfield
- Bungalow rear extension in Crawley
- Bungalow rear extension in Cranleigh
- Bungalow rear extension in Horley
- Bungalow rear extension in Hurstpierpoint
Other work in Horsham:
FAQ
Bungalow rear extension questions in Horsham
How much does a bungalow rear extension cost in Horsham?
As a guide, £2,070–£3,360 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £25,000–£40,500 at that rate. Your written price follows the survey.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
How deep can I extend?
The same limits as a house: 3 or 4 metres in England, more with prior approval.
How long does a rear extension take to build in Horsham?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Is the site visit in Horsham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my Horsham house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.