Darwen, Lancashire
Wraparound extension in Darwen
An L-shaped extension that fills the side return and runs across the back. If you live in Darwen and want to know what a wraparound extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Darwen (BB1, BB2 and BB3) as part of our Lancashire work. Wraparounds are the natural next step for the end-of-terrace and Victorian houses in Lancashire where a side return alone would leave the room too narrow.
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 wraparound extension cost in Darwen?
A wraparound extension in Darwen is priced at £2,070–£3,380 per square metre including VAT as a guide, before kitchen fit-out and fees. North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Size | Guide price inc VAT |
|---|---|
| L-shaped, about 22 m² of new floor | £45,500–£74,500 |
| L-shaped, about 30 m² of new floor | £62,000–£101,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a wraparound extension in Darwen?
Here is how the rules in England apply to a wraparound extension in Darwen.
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 Darwen like to extend?
Stone and brick terraces are common around Darwen. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier.
How a wraparound extension in Darwen comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Wraparound extensions near Darwen
We also build wraparound extensions in nearby Blackburn (3.7 miles) and Haslingden (5.8 miles).
- Wraparound extension in Blackburn
- Wraparound extension in Haslingden
- Wraparound extension in Accrington
- Wraparound extension in Great Harwood
- Wraparound extension in Ramsbottom
Other work in Darwen:
FAQ
Wraparound extension questions in Darwen
How much does a wraparound extension cost in Darwen?
As a guide, £2,070–£3,380 per square metre including VAT for a standard specification. For example, L-shaped, about 22 m² of new floor: about £45,500–£74,500 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.
Can the corner be all glass?
Yes, with a steel or aluminium post or a structural glass corner. It needs careful thermal detailing to meet Building Regulations.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
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.
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.