Rear extension planning drawings in Biggleswade

What do rear extension planning drawings cost in Biggleswade?

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. Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.

Do you need planning permission for a rear extension in Biggleswade?

Here is how the rules in England apply to a rear extension in Biggleswade.

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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.

What are homes in Biggleswade like to extend?

Biggleswade mixes Victorian terraces with 1930s semis, so both side returns and full-width kitchen extensions suit houses here.

How a rear extension in Biggleswade comes together

1. Survey visit

   We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.

2. Design and guide price

   Two or three layout options with a guide price for each, so you choose the design knowing what it costs.

3. Approvals

   Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.

4. 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 Biggleswade

From Biggleswade, the nearest places we also cover are Sandy (3.1 miles) and Henlow (4.0 miles).

• Rear extension planning drawings in Sandy
• Rear extension planning drawings in Henlow
• Rear extension planning drawings in Baldock
• Rear extension planning drawings in Letchworth Garden City
• Rear extension planning drawings in St Neots

Other work in Biggleswade:

• Single-storey rear extension
• Two-storey rear extension
• Kitchen-diner rear extension
• Side return extension
• Wraparound extension
• Glazed rear extension

All rear extensions in Biggleswade