West Derby, Merseyside
Rear extension planning drawings in West Derby
Rear extension planning drawings in West Derby: measured survey, design options, planning drawings and the application, handled for you. We measure the house, show you what the rules allow, price it in writing and build it.
West Derby and its postcode districts L11, L12 and L13 are part of our Merseyside coverage. Rear extension applications in Merseyside are householder applications, which councils aim to decide within about eight weeks.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
What do rear extension planning drawings cost in West Derby?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension, or £2,000–£3,500 for a two-storey scheme. A householder planning application in England costs £548 (£575 for applications made from 8 December 2026), and a lawful development certificate for proposed work costs half the householder fee. 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 rear extension in West Derby?
Here is how the rules in England apply to a rear extension in West Derby.
England's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.
Councils aim to decide householder applications within 8 weeks of validation, and prior approval within 42 days.
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 West Derby like to extend?
Stone and brick terraces are common around West Derby. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier.
How a rear extension in West Derby 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Rear extension planning drawings near West Derby
We also build rear extensions in nearby Norris Green (1.0 miles) and Knotty Ash (1.3 miles).
- Rear extension planning drawings in Norris Green
- Rear extension planning drawings in Knotty Ash
- Rear extension planning drawings in Croxteth
- Rear extension planning drawings in Old Swan
- Rear extension planning drawings in Fazakerley
Other work in West Derby:
FAQ
Rear extension planning drawings questions in West Derby
Do you handle building control in West Derby?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can you match the brick or stone on my West Derby house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
What if planning is refused?
We review the reasons with you, amend and resubmit (often free of a second fee within 12 months in England) or appeal.
How long does a rear extension take to build in West Derby?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.
Do I need planning permission for a rear extension in West Derby?
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.