Northumberland Park, Greater London
Side return extension in Northumberland Park
We plan and build side return extensions for homeowners in Northumberland Park. Infilling the narrow passage beside a Victorian or Edwardian back addition. Start with a free site visit, then a written price once the design is agreed.
Northumberland Park and its postcode districts N9, N17 and N18 are part of our Greater London coverage. In Northumberland Park we check the boundary line and the neighbour's gutter before drawing a side return, because a few centimetres decide whether the wall goes on or beside the boundary.
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 side return extension cost in Northumberland Park?
In Northumberland Park, our guide for a side return extension is £2,990–£4,940 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 |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £36,000–£59,500 |
| 2.5 m wide × 7 m deep (17.5 m²) | £52,500–£86,500 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a side return extension in Northumberland Park?
The planning route for a side return extension in Northumberland Park is set by England's householder rules and your council.
Side return infills and the side leg of a wraparound are treated as side extensions in England: single-storey, no more than 4 metres high and no wider than half the original house. They are not permitted development in conservation areas, National Parks or National Landscapes, and a joined wraparound often needs a planning application because the side and rear rules apply together.
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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Northumberland Park like to extend?
Period terraces in Northumberland Park 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 side return extension in Northumberland Park 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Side return extensions near Northumberland Park
From Northumberland Park, the nearest places we also cover are Tottenham (0.4 miles) and Tottenham Hale (0.7 miles).
- Side return extension in Tottenham
- Side return extension in Tottenham Hale
- Side return extension in Edmonton
- Side return extension in Walthamstow
- Side return extension in Southgate
Other work in Northumberland Park:
FAQ
Side return extension questions in Northumberland Park
Do you handle building control in Northumberland Park?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
What postcode areas do you cover around Northumberland Park?
Including N9, N17 and N18, and the surrounding Greater London area.
Do I need my neighbour's permission?
Not their permission, but in England and Wales you must serve party wall notices, and a neighbour can consent in writing or ask for a surveyor's award.
Can you match the brick or stone on my Northumberland Park house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How much does a side return extension cost in Northumberland Park?
As a guide, £2,990–£4,940 per square metre including VAT for a standard specification. For example, 2 m wide × 6 m deep (12 m²): about £36,000–£59,500 at that rate. Your written price follows the survey.
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.