Harrow, Greater London
Bungalow rear extension in Harrow
We plan and build rear extensions for bungalows for homeowners in Harrow. Single-storey rear extensions that keep everything on one level. Start with a free site visit, then a written price once the design is agreed.
Harrow is covered from our Greater London round, including HA1, HA2, HA3 and HA5. For bungalows in Greater London, a rear extension is the usual way to add space without adding stairs.
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 Harrow?
Guide prices for a bungalow rear extension in Harrow start from our London rate of £2,400–£3,900 per square metre, including VAT. London prices sit at the top of our range because of labour rates, access through the house, parking suspensions and skip licences.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £29,000–£47,000 |
| 4 m wide × 6 m deep (24 m²) | £57,500–£93,500 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a bungalow rear extension in Harrow?
Planning for a bungalow rear extension in Harrow follows the English householder rules.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
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 Harrow like to extend?
Much of Harrow is 1920s and 1930s semis and short terraces with longer gardens than inner London, which suit full-width single-storey rear extensions. Parking suspensions, skip licences and controlled hours on residential streets shape the programme more than the build itself.
How a bungalow rear extension in Harrow 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.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Bungalow rear extensions near Harrow
Close by, we work in Harrow on the Hill, about 0.5 miles away, and Headstone, about 1.1 miles away.
- Bungalow rear extension in Harrow on the Hill
- Bungalow rear extension in Headstone
- Bungalow rear extension in Wealdstone
- Bungalow rear extension in Sudbury
- Bungalow rear extension in Harrow Weald
Other work in Harrow:
FAQ
Bungalow rear extension questions in Harrow
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Is the site visit in Harrow free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How deep can I extend?
The same limits as a house: 3 or 4 metres in England, more with prior approval.
Do I need planning permission for a rear extension in Harrow?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
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.
Can you match the brick or stone on my Harrow house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.