Bletchley, Buckinghamshire
Rear extension planning drawings in Bletchley
For homes in Bletchley, a rear extension is often the simplest way to gain space without moving. Measured survey, design options, planning drawings and the application, handled for you. We take it from survey to completion certificate.
Bletchley and its postcode districts MK1, MK2 and MK3 are part of our Buckinghamshire coverage. For Bletchley 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 Bletchley?
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. These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a rear extension in Bletchley?
Whether your rear extension in Bletchley needs a planning application depends on its size, your house and any local restrictions.
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 Bletchley like to extend?
Bletchley has a mix of Victorian terraces near the centre and larger Edwardian and inter-war houses further out. Clay soils across much of the South East mean deeper foundations near trees, which we plan for at the survey.
How a rear extension in Bletchley 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.
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.
Rear extension planning drawings near Bletchley
We also build rear extensions in nearby Milton Keynes (3.5 miles) and Leighton Buzzard (6.2 miles).
- Rear extension planning drawings in Milton Keynes
- Rear extension planning drawings in Leighton Buzzard
- Rear extension planning drawings in Newport Pagnell
- Rear extension planning drawings in Flitwick
- Rear extension planning drawings in Ampthill
Other work in Bletchley:
FAQ
Rear extension planning drawings questions in Bletchley
How long does a rear extension take to build in Bletchley?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
What do rear extension planning drawings cost in Bletchley?
As a guide, £1,000–£2,500 including VAT for a single-storey rear extension and £2,000–£3,500 for a two-storey scheme, covering the measured survey, design options and the application. The council fee is extra.
Do neighbours get consulted?
Yes for a full application: the council writes to them or puts up a site notice.
Do you handle building control in Bletchley?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Bletchley free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Do I need planning permission for a rear extension in Bletchley?
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.