Covering Kent
Our coverage across Kent includes Maidstone, Gillingham, Chatham and Tunbridge Wells.
Homes in the South East
The South East has a lot of 1930s and post-war semi-detached housing, well suited to rear extensions and hip-to-gable loft conversions, alongside period properties in conservation areas that need a more careful design.
What is a double-storey extension?
Two-storey work has to sit comfortably with the house and the neighbours, so most of the design effort goes into the roofline, window positions and how the new first floor connects to the landing. We handle the planning application, the structural design and the building control process, then build, roof and finish both floors.
- Measured survey, design and planning drawings
- Structural engineer’s design and calculations
- Windows, insulation, plastering, electrics and plumbing
How much does a double-storey extension cost in Kent?
Use these ranges to budget for double-storey extensions; the survey turns them into a fixed price for the agreed specification.
| Double-storey extensions | Guide price incl. VAT |
|---|---|
| Standard specification | £2,400 to £2,900 per m² |
| Good specification | £2,900 to £3,400 per m² |
| High specification | £3,400 to £3,850 per m² |
Do you need permission for a double-storey extension in Kent?
In England we deal with the council’s planning team for permission or a lawful development certificate, with building control (the council or a registered building control approver) for inspections, and with neighbours under the Party Wall etc. Act 1996 where it applies.
Two-storey rear extensions can sometimes be permitted development in England (no more than 3 m deep, at least 7 m from the rear boundary, roof pitch to match), but most two-storey and all two-storey side extensions need householder planning permission.
What can change the price or programme?
- Neighbours’ light is assessed using the 45-degree guide many councils use.
- The first-floor link can mean moving a bathroom or reshaping the landing.
What happens after I enquire?
- Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
- Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
- Price and paperwork. The design is priced line by line, and we submit the planning and building control applications.
- Construction and completion. One site lead co-ordinates every trade through to the building control certificate.
Double-storey extensions: common questions
Is a two-storey extension better value than a single-storey one?
Per square metre, usually yes, because the foundations and roof serve two floors of space.
How long does a two-storey extension take?
Around 14 to 24 weeks on site, plus the planning period before that.
Do you work in Kent?
Yes. Kent is within our coverage for double-storey extensions, along with nearby Maidstone and Gillingham.
Other towns nearby
- Double-storey extensions in Maidstone
- Double-storey extensions in Gillingham
- Double-storey extensions in Chatham
- Double-storey extensions in Tunbridge Wells
- Double-storey extensions in Folkestone
- Double-storey extensions in Margate
- Double-storey extensions in Ashford
- Double-storey extensions in Canterbury
- Double-storey extensions in Sittingbourne
- Double-storey extensions in Gravesend
- Double-storey extensions in Dartford
- Double-storey extensions in Ramsgate
- Double-storey extensions in Dover
- Double-storey extensions in Tonbridge
- Double-storey extensions in Strood
- Double-storey extensions in Whitstable
- Double-storey extensions in Deal
- Double-storey extensions in Sevenoaks
- Double-storey extensions in Rochester
- Double-storey extensions in Herne Bay
- Double-storey extensions in Broadstairs
- Double-storey extensions in Faversham
- Double-storey extensions in Swanley
Learn more about double-storey extensions, or see every project we cover in Kent.