Raft foundation for house extension, how much extra will it cost?

[Andy Clarke]

Another 2-3k on top of footings cost depending on spec and Area covered

[Charles Brown]

That’s for a raft we did cost £1500 for the steel then there was £3600 of concrete went in (you need two pours for a raft)

[Charles Bell]

Why do you need a raft? Have you got a geotechnical report or is there another reason?

Also, do you mean a ground bearing raft or a piled raft? The second will be considerably more expensive than people are telling you.

[Charles Bryden]

It cost me about 30% more to have an engineered raft, than a standard trench fill foundation.

We had trees and conifers nearby, so the Building Inspector made us go that way.

• This reply was modified 1 year, 1 month ago by  Charles Bryden.