Extensions in Leighton Buzzard
Single storey extensions in Leighton Buzzard, with planning, building control and foundations planned from day one.
A single storey extension in Leighton Buzzard typically costs £2,400–£3,200 per m² finished ready for decoration — roughly £29,000–£38,500 for a 12m² rear extension, with any kitchen fit-out priced separately. An extension in Leighton Buzzard needs building regulations approval — Central Bedfordshire Council publishes its building control charges as a schedule (plan charge on submission, inspection charge after the first visit); ask its Building Control team for the current figure for your size of extension. It either fits within permitted development or needs householder planning permission, which costs £548 from April 2026 and is decided within eight weeks.
- Typical cost
- £2,400–£3,200 per m²
- Council
- Central Bedfordshire Council
- Planning
- Permitted development or £548 application
- Building regulations
- Needed
- Ground
- Greensand sand or Gault clay
Prices are our 2026 guide prices; your fixed price comes in writing after the free visit. Council fees checked October 2026.
Extensions on Leighton Buzzard houses
Leighton Buzzard and Linslade share a market-town High Street with more than 70 listed buildings, Victorian red-brick terraces and semis in Linslade — many right on the pavement — and large estates from the 1960s onwards, with more growth on the south and east sides.
Most extensions we build here are single storey at the rear, matched to the existing brick or stone, with the drainage and any sewer nearby checked before the footings are dug.
We cover Leighton Buzzard (LU7) and the areas around it, including Linslade, Heath and Reach, Billington, Eggington, Stanbridge, Hockliffe, Southcott and Soulbury. Travel does not change the price.
Ground, drainage and conservation in Leighton Buzzard
The town marks the western end of the Woburn Sands — the silica sand still quarried here — and borders the Gault clay vale to the south and east, with river deposits along the Ouzel. Sandy plots drain freely; clay plots need the drainage designed in. Because the ground varies, the foundation depth is confirmed from the trial holes and agreed with building control on site.
Leighton Buzzard and Linslade each have a conservation area, but neither has an Article 4 direction, so front driveways follow the normal permeable-surface rule.
The River Ouzel and the Clipstone Brook run through the town; a 2015 scheme at Carina Drive cut the annual flood chance for 29 homes from 1 in 25 to less than 1 in 100. You can check any address on the Environment Agency flood map.
Sources: Linslade Conservation Area appraisal · Flood information for Leighton Buzzard.
Planning, building regulations and fees in Leighton Buzzard
- Step 1Check whether it fits permitted development, and if you want certainty apply for a lawful development certificate (£274). Planning Portal: extensions
- Step 2In the Leighton Buzzard conservation area, side extensions and rear extensions of more than one storey always need planning permission.
- Step 3If permission is needed, apply for householder planning permission (£548 from April 2026), decided within eight weeks. Pre-application advice from Central Bedfordshire Council costs £150 for written advice, or £300 with a meeting (both including VAT), with a reply within four weeks. Planning Portal: application fees
- Step 4Apply for building regulations approval: Central Bedfordshire Council publishes its building control charges as a schedule (plan charge on submission, inspection charge after the first visit); ask its Building Control team for the current figure for your size of extension. Central Bedfordshire Council: building control charges
- Step 5We build to the approved drawings and work to the building control inspections at each stage.
Council fees and rules checked October 2026. Planning fees are the national fees from 1 April 2026.
Everything below is included in an extension
- Drawings and the building control application
- Foundations set from a trial hole, not a guess
- Drainage diverted or rebuilt where it needs to be
- Build-over and party wall matters flagged and handled
- Roof and threshold junctions detailed properly
- Electrics and plumbing by registered trades, with certificates
- Building control sign-off at the end
- A five year guarantee, in writing
Extensions in Leighton Buzzard: questions
How much does a single storey extension cost in Leighton Buzzard?
How much does planning and building control cost for an extension in Leighton Buzzard?
Do I need planning permission for an extension in Leighton Buzzard?
Is Leighton Buzzard in a conservation area?
What foundations does an extension need in Leighton Buzzard?
Free design visits across Leighton Buzzard
We measure up, talk it through and send a written proposal with the programme and one whole price. No pressure and no follow-up sales calls.