Extension over integral garage

EssexExile

We built over our attached garage. The side wall had to be underpinned, that only added about £1500 to the £40,000 bill (it was a while ago). The garage side wall was 9" brick so a piece of angle iron had to go on that to make it wide enough to build a cavity wall onto. Steel beams front & back to support the walls above there.

Your designer/structural engineer will sort it all out.

FreeBear

A house not far from me had something similar built. In their case, the party wall was block construction with no real foundations. The builders sank some quite deep piles, and built a steel framework to support the first floor extension.

Always plenty of options.

Brebal

Thanks everyone this has been useful, although I’m thinking it’s not going to work. I need a professional to check every aspect and not sure how much that will cost and how much I’m prepared to spend when it might not be able to go ahead anyway. Plus my budget for the whole thing is £20k. So with all the extra potential work, I think I might struggle.

Doozergirl

I think you'd have been struggling at £20k without the research, tbh.

TELLIT01

Doozergirl wrote: »

I think you'd have been struggling at £20k without the research, tbh.

I agree, typical garage is roughly 3 metres x 5 metres (minimum) typical prices bandied around are in the region of £2k per square metre, particularly when working at height so potentially £30k plus.

Brebal

Yeah I was hoping it would be cheaper if there were no foundations to do. Obviously less work then than a single storey where you’re digging down and then doing it all. Oh well

Jonah01

We are in the process of building over our attached single skin garage.

First thing to do will be to expose the foundations and see what you have.

Ours were 1m deep, 0.6m concrete and 0.45m wide.

We haven't got any steel beams and have gone timber on top of the single skin all the way around.

20k doesn't sound enough as it isn't a case of just building on top. They'll have to rip the whole garage roof off including joists.