Two-storey extensions in Holborn
Planning a bigger home in Holborn? Compare extension types and guide prices below, then book a free site visit.
Holborn at a glance
- Postcode districts
- EC1, EC1A, EC1M, EC1N, EC1R, EC3P and nearby districts
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Soho (0.7 miles), King's Cross (0.9 miles), St James's (1.1 miles), Islington (1.5 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.
We cover Holborn (EC1, EC1A, EC1M, EC1N, EC1R, EC3P and nearby districts) and the places around it, including Soho (0.7 miles), King's Cross (0.9 miles) and St James's.
Extensions available in Holborn
Two-storey rear extensions
From £67,000 in Holborn. Free visit to firm it up.
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Two-storey side extensions
Our London guide starts at £103,500 for this type.
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Two-storey wraparound extensions
Holborn guide price from £144,500, Standard spec.
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Part single, part two-storey extensions
Design, approvals and build for Holborn homes. Guide from £86,500.
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Extensions over a garage
Our London guide starts at £38,000 for this type.
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First-floor extensions
Our London guide starts at £30,000 for this type.
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Two-storey extensions for semi-detached houses
Our London guide starts at £67,000 for this type.
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Two-storey extensions for detached houses
Guide from £103,500 in Holborn, including VAT.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Holborn. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Holborn homes. Guide from £67,000 (plus en-suite).
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 Holborn we also design annexes, home offices and bedrooms over garages.
Also available in Greater London
- 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 Holborn
Holborn 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 Holborn
Do you cover Holborn?
Yes. We cover Holborn (EC1, EC1A, EC1M, EC1N, EC1R, EC3P and nearby districts) and the surrounding area, including Soho and King's Cross. The first site visit is free.
What does a two-storey extension cost in Holborn?
Using our London 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 £67,000–£90,500 including VAT. An extension over a garage is about £38,000–£55,000.
Which other places near Holborn do you cover?
Everywhere around it, including Soho (0.7 miles), King's Cross (0.9 miles) and St James's (1.1 miles), and the rest of Greater London.