Harlesden, Greater London
Terraced house rear extension in Harlesden
We plan and build rear extensions for terraced houses for homeowners in Harlesden. Rear and side return extensions for terraces, with access through the house and two neighbours. Start with a free site visit, then a written price once the design is agreed.
Harlesden is covered from our Greater London round, including NW2, NW10 and W10. Terraced streets make up much of the housing in parts of Greater London, and most rear extensions here go in without side access.
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 terraced house rear extension cost in Harlesden?
In Harlesden, our guide for a terraced house rear extension is £2,660–£4,290 per square metre including VAT for a standard specification. 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 × 4.5 m deep (13.5 m²) | £36,000–£58,000 |
| 3 m wide × 6 m deep (18 m²) | £48,000–£77,000 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a terraced house rear extension in Harlesden?
Here is how the rules in England apply to a terraced house rear extension in Harlesden.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
The Party Wall etc. Act 1996 applies in England: you serve notice two months before work to a shared wall, and one month before digging foundations within 3 metres (or 6 metres for deeper foundations) of a neighbour's building. Neighbours can agree in writing; if they dissent, surveyors agree an award.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Harlesden like to extend?
Period terraces in Harlesden sit alongside flats, and the difference matters: houses usually keep permitted development rights, while flats and maisonettes need planning permission for any rear extension.
How a terraced house rear extension in Harlesden comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
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.
Terraced house rear extensions near Harlesden
We also build rear extensions for terraced houses in nearby Willesden (0.8 miles) and Kensal Green (1.2 miles).
- Terraced house rear extension in Willesden
- Terraced house rear extension in Kensal Green
- Terraced house rear extension in Queen's Park
- Terraced house rear extension in Cricklewood
- Terraced house rear extension in Wembley
Other work in Harlesden:
FAQ
Terraced house rear extension questions in Harlesden
Do I need planning permission for a rear extension in Harlesden?
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.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
How deep can I go on a terrace?
3 metres under permitted development in England, or up to 6 metres with prior approval outside designated land.
What postcode areas do you cover around Harlesden?
Including NW2, NW10 and W10, and the surrounding Greater London area.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
Can you match the brick or stone on my Harlesden house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.