Building a room on top of a garage - how much?

[535dman]

I know this is a vague question as it depends on the size of the room but it's a detached house with a single garage......

I've seen a house that has potential to build a room and on suite on top of the single garage which is attached to the house - the room would probably be around 14'x12' and an on-suite - around 8' x 8'....wanted an idea on building costs (excluding fixures and fittings)...

Any builders on here?

[khushy]

assuming that the existing garage's foundations are up to it and the existing walls of the garage are up to the job ( probably not) I would say that you are looking @ £20k all in!

New foundations and new garage walls will add another £10k to £15k to that.

The rough price is for a bare shell - ISH!!!!

Khushy

[535dman]

Thanks mate thought it wouldbe around £25ish

[JeffC]

I demolished an ajoining single garage and built another garage 22ftx8ft long with a kids playroom room on the back of it 16ftxft long, with same size 2 rooms above with jackand jill on suite and re-roofed the full house , I had the shell up for under £10k inc planning and getting rid of the rubbel, but final bill ended up at £22k completley finished inc all fittings.

[535dman]

That sounds like a cracking deal Jeff!

[JeffC]

Its a huge extension was 5 years ago and builders unlike now were quiet as I did it in January-March .. costs from memory , planning / architect £1k , demolish/ get rid of rubel/dig out and concrete founds was £2k.. builders charged me £2800 labour took them 3 weeks working average 4 days a week top half of my house is block and rendered so once they got the brickwork done it flew it up.strip off existing and refinish top half of house was £2k new roof was £4k inc labour materials, joiner/plumber and sparky were all freebies as I did the donkey work myself, windows /doors were £1k , materials and the stuff you dnt think of made up the rest , tbh I still cant see how it cost me what It did as I only budgeted £10k for the job all in , but everyone told me cost it then double it and yep they were right !! pleased I did it then and not now!!

[khushy]

we had a 6m x 6m garage built from scratch - single skin wall + tin roof + render + fookin amazing foundations + remote roller door for about £8k all in!

Khushy

[hog 1]

If you demolish and rebuild from ground-up [siting that original structure would not support weight of proposed extension, does not meet fire regs and handicap access] you can then reclaim the vat as it's a new build and not an extension. Budget 30k.

[Busamav]

hog 1 said:

If you demolish and rebuild from ground-up [siting that original structure would not support weight of proposed extension, does not meet fire regs and handicap access] you can then reclaim the vat as it's a new build and not an extension. Budget 30k.

Thats only if you wish to demolish the entire house , probably a bit extreme in this case though .

[535dman]

Yep only the garage in this case but I wont be going for the proposed property as I checked the council website and the house next door were refused permission for the same thing i was planning so it's a risk proposition!