Darwen, Lancashire
Terraced house rear extension in Darwen
Rear and side return extensions for terraces, with access through the house and two neighbours. If you live in Darwen and want to know what a terraced house rear 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. Terraced streets make up much of the housing in parts of Lancashire, 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 Darwen?
A terraced house rear extension in Darwen is priced at £1,930–£3,100 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 |
|---|---|
| 3 m wide × 4.5 m deep (13.5 m²) | £26,000–£42,000 |
| 3 m wide × 6 m deep (18 m²) | £34,500–£56,000 |
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 terraced house rear extension in Darwen?
Whether your terraced house rear extension in Darwen needs a planning application depends on its size, your house and any local restrictions.
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.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
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?
Darwen has long runs of terraced houses with back yards and alleys, plus 1930s semis further out. Yard extensions on terraces are often single-storey and close to both boundaries.
How a terraced house rear 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.
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.
Terraced house rear extensions near Darwen
Close by, we work in Blackburn, about 3.7 miles away, and Haslingden, about 5.8 miles away.
- Terraced house rear extension in Blackburn
- Terraced house rear extension in Haslingden
- Terraced house rear extension in Accrington
- Terraced house rear extension in Great Harwood
- Terraced house rear extension in Ramsbottom
Other work in Darwen:
FAQ
Terraced house rear extension questions in Darwen
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.
How much does a terraced house rear extension cost in Darwen?
As a guide, £1,930–£3,100 per square metre including VAT for a standard specification. For example, 3 m wide × 4.5 m deep (13.5 m²): about £26,000–£42,000 at that rate. Your written price follows the survey.
Do both neighbours need party wall notices?
Usually yes in England and Wales, because the extension often sits on or near both boundaries.
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.
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 Darwen house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.