Rear extension planning drawings in North Watford

What do rear extension planning drawings cost in North Watford?

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 North Watford?

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

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. 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 North Watford like to extend?

North Watford mixes Victorian terraces with 1930s semis, so both side returns and full-width kitchen extensions suit houses here. Rear extension applications in Hertfordshire are householder applications, which councils aim to decide within about eight weeks.

How a rear extension in North Watford 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. Options and costs

   We draw layout options and price each one, so the budget shapes the design rather than surprising you later.

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 North Watford

We also build rear extensions in nearby Watford (1.8 miles) and West Watford (1.9 miles).

• Rear extension planning drawings in Watford
• Rear extension planning drawings in West Watford
• Rear extension planning drawings in Abbots Langley
• Rear extension planning drawings in Bushey
• Rear extension planning drawings in Croxley Green

Other work in North Watford:

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

All rear extensions in North Watford