Two-storey extensions in Grays
Planning a bigger home in Grays? Compare extension types and guide prices below, then book a free site visit.
Grays at a glance
- Postcode districts
- RM17
- Area
- Essex, England
- Price region
- East of England
- Nearest towns
- Chafford Hundred (1.6 miles), Chadwell St Mary (1.7 miles), Tilbury (1.7 miles), Swanscombe (2.1 miles)
- Distance to Southend-on-Sea
- about 17.3 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 postcode district RM17 in and around Grays, along with neighbouring Chafford Hundred, Chadwell St Mary and Tilbury.
Extensions available in Grays
Two-storey rear extensions
Our East of England guide starts at £57,500 for this type.
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Two-storey side extensions
Design, approvals and build for Grays homes. Guide from £88,500.
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Two-storey wraparound extensions
Guide from £124,000 in Grays, including VAT.
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Part single, part two-storey extensions
Guide from £74,000 in Grays, including VAT.
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Extensions over a garage
Design, approvals and build for Grays homes. Guide from £32,500.
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First-floor extensions
Design, approvals and build for Grays homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Grays homes. Guide from £57,500.
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Two-storey extensions for detached houses
Grays guide price from £88,500, Standard spec.
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Kitchen extensions with bedrooms above
Guide from £57,500 (before kitchen units) in Grays, including VAT.
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Extra bedroom and en-suite extensions
Grays guide price from £57,500 (plus en-suite), Standard spec.
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 Grays we measure distances to every boundary before suggesting a type.
Also available in Essex
- 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 Grays
Grays 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 Grays
Do you cover Grays?
Yes. We cover Grays (RM17) and the surrounding area, including Chafford Hundred and Chadwell St Mary. The first site visit is free.
What does a two-storey extension cost in Grays?
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 Grays do you cover?
Everywhere around it, including Chafford Hundred (1.6 miles), Chadwell St Mary (1.7 miles) and Tilbury (1.7 miles), and the rest of Essex.