Two-storey extensions in Watford
Everything for a two-storey extension in Watford, in one place: types, guide prices for the East of England, the approval rules in England and how to get started.
Watford at a glance
- Postcode districts
- WD1 and WD2
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- West Watford (0.9 miles), Holywell (Hertfordshire) (1.4 miles), Bushey (1.7 miles), North Watford (1.8 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.
Around Watford we also work in West Watford, Holywell (Hertfordshire) and Bushey, and across the rest of Hertfordshire. Postcode districts in and near Watford: WD1 and WD2.
Extensions available in Watford
Two-storey rear extensions
From £57,500 in Watford. Free visit to firm it up.
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Two-storey side extensions
Our East of England guide starts at £88,500 for this type.
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Two-storey wraparound extensions
From £124,000 in Watford. Free visit to firm it up.
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Part single, part two-storey extensions
Guide from £74,000 in Watford, including VAT.
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Extensions over a garage
Watford guide price from £32,500, Standard spec.
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First-floor extensions
Guide from £26,000 in Watford, including VAT.
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Two-storey extensions for semi-detached houses
Watford guide price from £57,500, Standard spec.
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Two-storey extensions for detached houses
Design, approvals and build for Watford homes. Guide from £88,500.
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Kitchen extensions with bedrooms above
From £57,500 (before kitchen units) in Watford. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Watford guide price from £57,500 (plus en-suite), Standard spec.
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 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 Watford
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 Watford
Do you cover Watford?
Yes. We cover Watford (WD1 and WD2) and the surrounding area, including West Watford and Holywell (Hertfordshire). The first site visit is free.
What does a two-storey extension cost in 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 Watford do you cover?
Everywhere around it, including West Watford (0.9 miles), Holywell (Hertfordshire) (1.4 miles) and Bushey (1.7 miles), and the rest of Hertfordshire.