Key Takeaway
Explore the main factors affecting kitchen extension costs in Hampshire, including size, specification and fit-out, and use our free calculator for an initial estimate.
How do project costs and planning routes compare?
Extensions add to the building, while loft and garage conversions work with existing space; each has different structural and planning considerations. The route depends on the property, so these comparisons are not an individual planning decision or quotation.
| Project | Typically needs planning? | Main cost factors | Typical design route |
|---|---|---|---|
| Single-storey extension | May qualify for permitted development if all conditions apply | Footprint, foundations and specification | Survey, layout, planning check and technical drawings |
| Two-storey extension | Depends on the design and permitted development limits | Structure, roof design and specification | Survey, planning check and coordinated structural information |
| Loft conversion | Some roof works may qualify, subject to restrictions | Roof type, stairs and structural work | Roof and layout assessment, planning check and Building Regulations |
| Garage conversion | Often possible without a planning application, but exceptions apply | Insulation, structure and services | Survey, planning check and Building Regulations design |
Kitchen Extension Cost Hampshire: Budget Guide
A kitchen extension can add valuable living space, but project costs vary by size, specification, site conditions and fit-out. The older figures below are historical estimates, not current or verified 2026 prices or a quote. Use our free extension cost calculator for an initial estimate and confirm pricing with your contractor.
Have a project in mind? Start with a few details about your home.
Build an initial project budgetKitchen Extension Cost Summary: Historical Examples
A typical kitchen extension in Hampshire costs between £45,000 + VAT and £90,000 + VAT including the kitchen itself. Here's the breakdown:
Build Costs by Size
- Small (15m²): £33,000 - £42,000 + VAT build only
- Medium (25m²): £55,000 - £70,000 + VAT build only
- Large (35m²): £77,000 - £98,000 + VAT build only
Plus Kitchen Fitting
- Budget kitchen: £8,000 - £12,000 + VAT
- Mid-range kitchen: £15,000 - £25,000 + VAT
- High-end kitchen: £30,000 - £50,000 + VAT+
Plus Design & Professional Fees
- Pre-Build Package: £1,950 + VAT (planning + building regs, most popular)
- Premium Package: £2,950 + VAT (adds contractor tender + contract)
- Premium Plus Package: £3,950 + VAT (includes the staged programme of works and statutory notices before the build starts)
What Affects Kitchen Extension Costs?
1. Size and Layout
Kitchen extensions typically range from 15m² to 40m². Our extension cost calculator helps you determine the right size for your budget and requirements.
2. Specification Level
- Standard spec: UPVC windows, standard roof, basic finishes (£2,200 + VAT/m²)
- Mid-range: Bi-fold doors, roof lantern, quality finishes (£2,500 + VAT/m²)
- High spec: Premium glazing, underfloor heating, bespoke finishes (£2,800 + VAT/m²+)
3. Structural Requirements
Knocking through into existing rooms requires steelwork (£1,500-£4,000 + VAT depending on span) and may need party wall agreements with neighbours.
4. Services and Utilities
Relocating plumbing, gas, and electrics adds £3,000-£8,000 + VAT to kitchen extension costs.
Kitchen Extension Cost Breakdown Example
Here's a real example for a 25m² kitchen extension in Winchester:
| Item | Cost |
| Pre-Build Package (Pre-Build Package) | £1,950 + VAT |
| Build (25m² @ £2,400 + VAT/m²) | £60,000 + VAT |
| Structural steelwork | £3,500 + VAT |
| Kitchen (mid-range) | £18,000 + VAT |
| Underfloor heating | £2,500 + VAT |
| Landscaping/making good | £3,000 + VAT |
| Total | £89,000 + VAT |
How to Reduce Kitchen Extension Costs
- Use fixed-fee design services: Save £2,000-£4,000 vs hourly rates with Hampshire Build
- Stay within permitted development: Avoid planning fees and delays
- Get multiple builder quotes: Our Pre-Build Package includes tender-ready drawings
- Phase the work: Build first, fit kitchen later if budget is tight
- Choose standard sizes: Bespoke elements cost significantly more
Calculate Your Kitchen Extension Cost
Every kitchen extension is different. Our free extension cost calculator gives you a personalised estimate in under 60 seconds.
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- Design package recommendations
- Local planning insights for your postcode
- Detailed proposal by email
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