Howell & Sons Construction 01223 501605

Cost calculator

Extension & loft conversion cost calculator

A guide price range for your extension or loft conversion in Cambridgeshire, in about two minutes. Priced from our own real estimates, not national averages: over 20 recent jobs and more than 5,500 individually priced items, then fine-tuned for building costs where you live.

  1. Your project
  2. Your details
  3. Your guide price

Local prices, not national averages

Fine-tuned for where you live

Building costs aren't the same everywhere. Labour, materials and overheads cost more in London and the South East than in the North or Wales, sometimes by a quarter or more.

Our prices start from our own jobs in Cambridgeshire. When you give us your postcode, we adjust them using the building industry's regional cost figures (BCIS), so your guide price is as close to local rates as we can make it. The same goes for our estimates from your drawings.

We build within about 40 minutes of Barrington, near Cambridge. Just outside that? Get in touch anyway. If you're further away, you're still welcome to use our calculator and estimates.

Map of UK building costs by region compared with central London, the most expensive area: rest of London 5% less, South East 14% less, East of England 17% less, South West 18% less, North West 20% less, West Midlands and Scotland 23% less, East Midlands 24% less, Wales 25% less, Yorkshire 26% less, North East 27% less, Northern Ireland 30% less.