Rear extension planning drawings in Henley-on-Thames

What do rear extension planning drawings cost in Henley-on-Thames?

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 Henley-on-Thames?

Here is how the rules in England apply to a rear extension in Henley-on-Thames.

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. 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 Henley-on-Thames like to extend?

Commuter semis and detached houses make up much of Henley-on-Thames, and longer gardens make England's prior approval route for deeper rear extensions worth considering.

How a rear extension in Henley-on-Thames comes together

1. 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.

2. Drawings and budget

   Floor plans and elevations for the options, each with a guide price.

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 Henley-on-Thames

From Henley-on-Thames, the nearest places we also cover are Marlow (6.0 miles) and Reading (6.1 miles).

• Rear extension planning drawings in Marlow
• Rear extension planning drawings in Reading
• Rear extension planning drawings in Lower Earley
• Rear extension planning drawings in Maidenhead
• Rear extension planning drawings in Wokingham

Other work in Henley-on-Thames:

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

All rear extensions in Henley-on-Thames