A kitchen extension is one of the most transformative home improvements you can make — and one of the best investments in the Essex property market. But costs vary widely depending on size, specification, and whether you need planning permission. Here's what you should expect to budget in 2025.
Average Kitchen Extension Costs in Essex
A typical single-storey rear kitchen extension in Essex costs between £40,000 and £90,000, depending on size and specification. This includes all groundworks, structural work, roofing, windows, electrics, plumbing, plastering and decoration — but not the kitchen itself, which is a separate cost.
Key Cost Factors
The biggest factors affecting cost are: the size of the extension (cost per square metre typically ranges from £1,800–£2,500 in Essex); the roofing type (a lantern roof or glazed roof adds £3,000–£8,000 versus a standard flat or pitched roof); the glazing (bi-fold or sliding doors cost £3,000–£8,000 more than standard French doors); and the ground conditions.
Planning Permission Costs
A householder planning application costs £206 in England (2025). However, the real cost is the time and preparation involved — architectural drawings, planning reports and application management. Most contractors include this in their overall fee.
Don't Forget the Kitchen Itself
The kitchen extension costs above don't include the kitchen itself. A new kitchen from a mid-range supplier typically costs £8,000–£20,000 installed, and up to £30,000+ for a fully bespoke German kitchen. Budget for this separately when planning your overall project costs.
Ready to Get Started?
A kitchen extension is a superb investment for Essex homeowners — improving daily life and adding real value to your property. Contact Essex Loft Extensions on 01279 218410 for a free survey and detailed quote.
Essex Loft Extensions Team
Based in Harlow, Essex · 40 years experience · 01279 218410
