Two-storey extensions in Hatfield
Planning a bigger home in Hatfield? Compare extension types and guide prices below, then book a free site visit.
Hatfield at a glance
- Postcode districts
- AL9 and AL10
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Welwyn Garden City (2.7 miles), London Colney (4.1 miles), St Albans (4.8 miles), Potters Bar (5.2 miles)
- Distance to Watford
- about 10.5 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 Hatfield we also work in Welwyn Garden City, London Colney and St Albans, and across the rest of Hertfordshire. Postcode districts in and near Hatfield: AL9 and AL10.
Extensions available in Hatfield
Two-storey rear extensions
Design, approvals and build for Hatfield homes. Guide from £57,500.
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Two-storey side extensions
Design, approvals and build for Hatfield homes. Guide from £88,500.
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Two-storey wraparound extensions
For homes in Hatfield: typical guide from £124,000.
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Part single, part two-storey extensions
Guide from £74,000 in Hatfield, including VAT.
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Extensions over a garage
Guide from £32,500 in Hatfield, including VAT.
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First-floor extensions
Guide from £26,000 in Hatfield, including VAT.
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Two-storey extensions for semi-detached houses
For homes in Hatfield: typical guide from £57,500.
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Two-storey extensions for detached houses
From £88,500 in Hatfield. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Design, approvals and build for Hatfield homes. Guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Our East of England guide starts at £57,500 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Hatfield we also design annexes, home offices and bedrooms over garages.
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 Hatfield
Hatfield 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 Hatfield
Do you cover Hatfield?
Yes. We cover Hatfield (AL9 and AL10) and the surrounding area, including Welwyn Garden City and London Colney. The first site visit is free.
What does a two-storey extension cost in Hatfield?
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 Hatfield do you cover?
Everywhere around it, including Welwyn Garden City (2.7 miles), London Colney (4.1 miles) and St Albans (4.8 miles), and the rest of Hertfordshire.