Blandford Forum, Dorset
Rear extension planning drawings in Blandford Forum
Measured survey, design options, planning drawings and the application, handled for you. If you live in Blandford Forum and want to know what a rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Blandford Forum sits in Dorset, with postcode districts including DT11. For Blandford Forum homes we start with a measured survey, then draw options before anything is submitted.
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 Blandford Forum?
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. 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 rear extension in Blandford Forum?
The planning route for a rear extension in Blandford Forum is set by England's householder rules and your council.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
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. 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 Blandford Forum like to extend?
Stone-built and rendered houses are common around Blandford Forum, so matching the walling is a design decision in its own right: natural stone, reconstituted stone or a render finish across old and new.
How a rear extension in Blandford Forum 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.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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.
Rear extension planning drawings near Blandford Forum
We also build rear extensions in nearby Wimborne Minster (9.4 miles) and Broadstone (10.2 miles).
- Rear extension planning drawings in Wimborne Minster
- Rear extension planning drawings in Broadstone
- Rear extension planning drawings in Canford Heath
- Rear extension planning drawings in Ferndown
- Rear extension planning drawings in Poole
Other work in Blandford Forum:
FAQ
Rear extension planning drawings questions in Blandford Forum
Can you match the brick or stone on my Blandford Forum house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do you handle building control in Blandford Forum?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can I see the design in 3D?
Yes; we produce simple 3D views so you can judge the size and light.
Do I need planning permission for a rear extension in Blandford Forum?
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.
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 I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.