Rear extension planning drawings in Washington

What do rear extension planning drawings cost in Washington?

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. Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.

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

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

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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.

What are homes in Washington like to extend?

Terraces and semis are typical around Washington. On terraces a single-storey rear extension across the back yard is usually the practical choice; semis often have room for more.

How a rear extension in Washington comes together

1. Look round and measure

   A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.

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 Washington

Neighbouring places we cover include Chester-le-Street (3.7 miles) and The Boldons (3.9 miles).

• Rear extension planning drawings in Chester-le-Street
• Rear extension planning drawings in The Boldons
• Rear extension planning drawings in Felling
• Rear extension planning drawings in Houghton-le-Spring
• Rear extension planning drawings in Hebburn

Other work in Washington:

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

All rear extensions in Washington