Two-storey extensions in West Watford
We design, get approval for and build two-storey extensions in West Watford and the surrounding area. Choose the type of extension below or book a free site visit.
West Watford at a glance
- Postcode districts
- WD17
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Holywell (Hertfordshire) (0.8 miles), Watford (0.9 miles), North Watford (1.9 miles), Croxley Green (2.2 miles)
- Distance to Watford
- about 0.9 miles
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover postcode district WD17 in and around West Watford, along with neighbouring Holywell (Hertfordshire), Watford and North Watford.
Extensions available in West Watford
Two-storey rear extensions
From £57,500 in West Watford. Free visit to firm it up.
Learn more
Two-storey side extensions
West Watford guide price from £88,500, Standard spec.
Learn more
Two-storey wraparound extensions
West Watford guide price from £124,000, Standard spec.
Learn more
Part single, part two-storey extensions
West Watford guide price from £74,000, Standard spec.
Learn more
Extensions over a garage
Design, approvals and build for West Watford homes. Guide from £32,500.
Learn more
First-floor extensions
West Watford guide price from £26,000, Standard spec.
Learn more
Two-storey extensions for semi-detached houses
West Watford guide price from £57,500, Standard spec.
Learn more
Two-storey extensions for detached houses
Guide from £88,500 in West Watford, including VAT.
Learn more
Kitchen extensions with bedrooms above
Guide from £57,500 (before kitchen units) in West Watford, including VAT.
Learn more
Extra bedroom and en-suite extensions
Design, approvals and build for West Watford homes. Guide from £57,500 (plus en-suite).
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in West Watford, with a rough idea of the approval route and cost for each.
Also available in Hertfordshire
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for West Watford
West Watford is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Questions about extensions in West Watford
Do you cover West Watford?
Yes. We cover West Watford (WD17) and the surrounding area, including Holywell (Hertfordshire) and Watford. The first site visit is free.
What does a two-storey extension cost in West Watford?
Using our East of England guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £57,500–£78,000 including VAT. An extension over a garage is about £32,500–£47,500.
Which other places near West Watford do you cover?
Everywhere around it, including Holywell (Hertfordshire) (0.8 miles), Watford (0.9 miles) and North Watford (1.9 miles), and the rest of Hertfordshire.