Two-storey extensions in Hitchin
Everything for a two-storey extension in Hitchin, in one place: types, guide prices for the East of England, the approval rules in England and how to get started.
Hitchin at a glance
- Postcode districts
- SG4 and SG5
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Letchworth Garden City (3.2 miles), Stevenage (4.8 miles), Baldock (4.9 miles), Henlow (5.6 miles)
- Distance to Watford
- about 20.9 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 Hitchin (SG4 and SG5) and the places around it, including Letchworth Garden City (3.2 miles), Stevenage (4.8 miles) and Baldock.
Extensions available in Hitchin
Two-storey rear extensions
Design, approvals and build for Hitchin homes. Guide from £57,500.
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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 Hitchin. Free visit to firm it up.
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Part single, part two-storey extensions
Hitchin guide price from £74,000, Standard spec.
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Extensions over a garage
Guide from £32,500 in Hitchin, including VAT.
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First-floor extensions
Our East of England guide starts at £26,000 for this type.
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Two-storey extensions for semi-detached houses
Hitchin guide price from £57,500, Standard spec.
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Two-storey extensions for detached houses
Design, approvals and build for Hitchin homes. Guide from £88,500.
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Kitchen extensions with bedrooms above
Guide from £57,500 (before kitchen units) in Hitchin, including VAT.
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Extra bedroom and en-suite extensions
For homes in Hitchin: typical guide from £57,500 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Hitchin we measure distances to every boundary before suggesting a type.
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 Hitchin
Hitchin 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 Hitchin
Do you cover Hitchin?
Yes. We cover Hitchin (SG4 and SG5) and the surrounding area, including Letchworth Garden City and Stevenage. The first site visit is free.
What does a two-storey extension cost in Hitchin?
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 Hitchin do you cover?
Everywhere around it, including Letchworth Garden City (3.2 miles), Stevenage (4.8 miles) and Baldock (4.9 miles), and the rest of Hertfordshire.