Two-storey extensions in Harwich
Planning a bigger home in Harwich? Compare extension types and guide prices below, then book a free site visit.
Harwich at a glance
- Postcode districts
- CO12
- Area
- Essex, England
- Price region
- East of England
- Nearest towns
- Felixstowe (3.2 miles), Walton-on-the-Naze (6.5 miles), Frinton-on-Sea (7.9 miles), Kesgrave (8.6 miles)
- Distance to Southend-on-Sea
- about 37.1 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 Harwich (CO12) and the places around it, including Felixstowe (3.2 miles), Walton-on-the-Naze (6.5 miles) and Frinton-on-Sea.
Extensions available in Harwich
Two-storey rear extensions
Harwich guide price from £57,500, Standard spec.
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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
Our East of England guide starts at £124,000 for this type.
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Part single, part two-storey extensions
From £74,000 in Harwich. Free visit to firm it up.
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Extensions over a garage
Guide from £32,500 in Harwich, 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
Guide from £57,500 in Harwich, including VAT.
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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
Harwich guide price from £57,500 (before kitchen units), Standard spec.
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Extra bedroom and en-suite extensions
Design, approvals and build for Harwich homes. Guide from £57,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Essex, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Harwich
Harwich 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 Harwich
Do you cover Harwich?
Yes. We cover Harwich (CO12) and the surrounding area, including Felixstowe and Walton-on-the-Naze. The first site visit is free.
What does a two-storey extension cost in Harwich?
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 Harwich do you cover?
Everywhere around it, including Felixstowe (3.2 miles), Walton-on-the-Naze (6.5 miles) and Frinton-on-Sea (7.9 miles), and the rest of Essex.