“How much will it cost?” is the first question almost everyone asks. Every project is different, but these are honest ballpark figures for Aldershot, Farnham, Fleet, Camberley and the surrounding area – checked against the Federation of Master Builders (FMB), Checkatrade and other 2026 cost guides, and against the projects we price and build ourselves.
For a figure based on your own project, try our instant price calculator – it takes about two minutes.
Typical costs in 2026
| Project | Typical cost (excluding VAT) |
|---|---|
| Small single storey extension (around 15 m²) | £35,000 – £50,000 |
| Single storey extension (around 25 m²) | £55,000 – £80,000 |
| Two storey extension (around 40 m² over two floors) | £90,000 – £135,000 |
| Garage conversion (single garage) | £15,000 – £25,000 |
| Loft conversion (rear dormer) | £45,000 – £70,000 |
Built, plastered and ready to decorate. Ranges are wide on purpose – the specification makes a big difference. Figures are a guide, not a quote.
How our area compares
The FMB puts the national average for a single storey extension at around £1,800 – £3,000 per square metre, and says London and the South East typically run 30–50% above that. Our figures sit in that South East band – not the cheapest, and not the most expensive.
Garage conversions vary the most. National guides often quote for a basic job; we brick up the opening with bricks matched to your house, insulate the floor, walls and ceiling to building regulations, and often add a kitchenette or shower room – which is why the realistic range is a little higher.
What pushes the price up or down
- Size – bigger extensions cost less per square metre, but more overall. Small jobs still carry the same set-up costs.
- Opening up the house – taking out walls and putting in steel beams.
- Glazing – bifolds, sliding doors and roof lanterns.
- Kitchens and bathrooms – often the biggest single variable.
- Roof type – a pitched, tiled roof costs more than a flat roof.
- The ground – deeper foundations, drains in the way, or nearby trees.
What’s not in a build price
Allow for drawings, structural calculations, planning and building control fees, VAT and decoration. Guides typically suggest professional fees add 10–15% on top of the build.
See what real projects look like
- Wraparound Extension & Garage Conversion – Farnham
- Wraparound Extension & Kitchen Refit – Aldershot
- Two Storey Side & Single Storey Rear Extension – Camberley
- Garage Conversion – Tongham
Get a figure for your project
Our instant price calculator gives you an indicative range in a couple of minutes. After that, we’ll visit and give you a free indicative budget before anything is drawn.
Or call us on 01252 265865.
Our sources
Ranges are an average of: FMB – single storey extension costs (2026); FMB – two storey extension costs; Checkatrade – house extension cost 2026; Checkatrade – garage conversion cost 2026; Checkatrade – loft conversion cost 2026; other published 2026 UK cost guides; and our own recent projects. Checked October 2026.