Rear extension planning drawings in St Leonards-on-Sea

What do rear extension planning drawings cost in St Leonards-on-Sea?

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 St Leonards-on-Sea?

Here is how the rules in England apply to a rear extension in St Leonards-on-Sea.

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 St Leonards-on-Sea like to extend?

Around St Leonards-on-Sea the housing ranges from inter-war semis to 1960s and 1970s estates with good-sized gardens. Many of the newer estates had permitted development rights removed by condition, so we check the planning history before anything is drawn.

How a rear extension in St Leonards-on-Sea 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 St Leonards-on-Sea

Neighbouring places we cover include Hastings (1.5 miles) and Bexhill-on-Sea (3.3 miles).

• Rear extension planning drawings in Hastings
• Rear extension planning drawings in Bexhill-on-Sea
• Rear extension planning drawings in Hailsham
• Rear extension planning drawings in Eastbourne
• Rear extension planning drawings in Seaford

Other work in St Leonards-on-Sea:

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

All rear extensions in St Leonards-on-Sea