Rear extension planning drawings in Rickmansworth

What do rear extension planning drawings cost in Rickmansworth?

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 Rickmansworth?

The planning route for a rear extension in Rickmansworth 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. 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 Rickmansworth like to extend?

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

How a rear extension in Rickmansworth 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. Planning and regulations

   We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.

4. Written price, then build

   Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.

Rear extension planning drawings near Rickmansworth

Close by, we work in Batchworth, about 0.7 miles away, and Croxley Green, about 1.2 miles away.

• Rear extension planning drawings in Batchworth
• Rear extension planning drawings in Croxley Green
• Rear extension planning drawings in Chorleywood
• Rear extension planning drawings in West Watford
• Rear extension planning drawings in Northwood

Other work in Rickmansworth:

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

All rear extensions in Rickmansworth