Two-storey extensions in Hemel Hempstead
Everything for a two-storey extension in Hemel Hempstead, in one place: types, guide prices for the East of England, the approval rules in England and how to get started.
Hemel Hempstead at a glance
- Postcode districts
- HP1, HP2 and HP3
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Leverstock Green (0.8 miles), Abbots Langley (3.6 miles), Berkhamsted (5 miles), St Albans (5 miles)
- Distance to Watford
- about 7.2 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 Hemel Hempstead (HP1, HP2 and HP3) and the places around it, including Leverstock Green (0.8 miles), Abbots Langley (3.6 miles) and Berkhamsted.
Extensions available in Hemel Hempstead
Two-storey rear extensions
For homes in Hemel Hempstead: typical guide from £57,500.
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Two-storey side extensions
Guide from £88,500 in Hemel Hempstead, including VAT.
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Two-storey wraparound extensions
Guide from £124,000 in Hemel Hempstead, including VAT.
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Part single, part two-storey extensions
Guide from £74,000 in Hemel Hempstead, including VAT.
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Extensions over a garage
Design, approvals and build for Hemel Hempstead homes. Guide from £32,500.
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First-floor extensions
From £26,000 in Hemel Hempstead. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Hemel Hempstead guide price from £57,500, Standard spec.
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Two-storey extensions for detached houses
Our East of England guide starts at £88,500 for this type.
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Kitchen extensions with bedrooms above
For homes in Hemel Hempstead: typical guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
For homes in Hemel Hempstead: typical 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 Hemel Hempstead, 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 Hemel Hempstead
Hemel Hempstead 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 Hemel Hempstead
Do you cover Hemel Hempstead?
Yes. We cover Hemel Hempstead (HP1, HP2 and HP3) and the surrounding area, including Leverstock Green and Abbots Langley. The first site visit is free.
What does a two-storey extension cost in Hemel Hempstead?
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 Hemel Hempstead do you cover?
Everywhere around it, including Leverstock Green (0.8 miles), Abbots Langley (3.6 miles) and Berkhamsted (5 miles), and the rest of Hertfordshire.