England
Rear extensions in Kent
Across Kent we handle the whole rear extension: survey, drawings, the planning route, building control and the build. Towns we cover here include Maidstone, Gillingham and Chatham.
What are homes in Kent like to extend?
Around Kent the housing ranges from inter-war semis to 1960s and 1970s estates with good-sized gardens. Many of the newer estates had permitted development rights removed by condition, so we check the planning history before anything is drawn.
Rear extension prices in Kent
South East prices run above our West Midlands baseline, mainly on labour rates and clay-soil foundations. Per square metre including VAT, standard specification:
| Extension | Per m² |
|---|---|
| Single-storey rear extension | £2,130–£3,470 |
| Two-storey (per m² across both floors) | £2,020–£3,020 |
| Side return | £2,580–£4,260 |
| Wraparound | £2,460–£4,030 |
| Glass-led | £3,140–£5,380 |
Planning and building rules in Kent
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
Rear extensions we build in Kent
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Larger home extension prior approval (England)
- Rear extension plans and planning applications
- Building Regulations for rear extensions
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for detached houses
- Rear extensions for bungalows
- Flat-roof rear extensions
Towns and districts in Kent
The main places we cover in Kent include Maidstone, Gillingham and Chatham, across postcode areas BR, CT, DA, ME and TN.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Maidstone | ME14, ME15, ME16 | Snodland (5.4 miles) |
| Gillingham | ME7, ME8 | Chatham (1.1 miles) |
| Chatham | ME1, ME4, ME7 | Rochester (1.1 miles) |
| Royal Tunbridge Wells | TN1, TN2, TN3 | Tonbridge (4.3 miles) |
| Folkestone | CT19, CT20 | Hythe (3.7 miles) |
| Margate | CT8, CT9, CT11 | Broadstairs (2.9 miles) |
| Ashford | TN23, TN24 | Hythe (10.5 miles) |
| Canterbury | CT1, CT2, CT5 | Whitstable (6.1 miles) |
| Sittingbourne | ME9, ME10, ME12 | Faversham (7.0 miles) |
| Gravesend | DA11, DA12 | Tilbury (1.5 miles) |
- Maidstone
- Gillingham
- Chatham
- Royal Tunbridge Wells
- Folkestone
- Margate
- Ashford
- Canterbury
- Sittingbourne
- Gravesend
- Dartford
- Ramsgate
- Dover
- Tonbridge
- Strood
- Whitstable
- Deal
- Sevenoaks
- Rochester
- Herne Bay
- Broadstairs
- Faversham
- Swanley
- Longfield
- Hartley
- Swanscombe
- Hythe
- Chelsfield
- Sheerness
- Biggin Hill
- Snodland
Areas near Kent
FAQ
Questions people ask
How much does a rear extension cost in Kent?
As a guide, £2,130–£3,470 per square metre including VAT for a standard single-storey extension at South East England rates.
Do I need planning permission in Kent?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Which towns in Kent do you cover?
31 towns and districts, including Maidstone, Gillingham and Chatham.
Do you handle building control?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.