Rough estimate on under garage conversion

[anonymous-user]

Any builders around?

I wanted to get a rough estimate on how much it would cost to convert my garage understore.
Basically I live on a hill and we have a detached double garage at the top of the property and then steps down to the house.

Under the garage we have an "understore", it is a 5.5m by 4.25m room, with walls but no solid flooring (its uneven mud).
When i say walls, its open brick with cement pillar roof - its very damp, dark and dingy !

I want to convert this into a home office with shower and toilet facilties, and put in a couple of windows to let more natural light in.
We have power there, but thats it (no plumbing).

Could anyone provide a rough idea on expected costs to convert - it defintely needs tanking as its very damp in there.

Cheers

[Qcarchoo]

At a rough guess I'd say around £20-25K.

[D14 AYS]

Qcarchoo said:

At a rough guess I'd say around £20-25K.

That is not far off

[skeeterm5]

I had a quote for tanking and the making good my cellar which came out at £10k. They used a plastic membrane to tank and a small pump to 'vent' the water out of the house.

S

[anonymous-user]

Thanks for the replies guys, i was guessing about £20k, so hopefully shouldn't be too far off.