Cost of converting an attached garage

[SF38]

Grateful for any advice!

Looking at buying a 3 bed with an attached garage, with the aim of turning it in to a fourth bedroom with a WC or small en suite if size/budget allows. The garage already has electricity, but would need flooring, a false ceiling, spotlights, a radiator and the garage door would be replaced with a wall and a window. We would then need to plumb the WC (plus shower and basin), which should be fine as the kitchen is adjacent.

Does anyone know roughly how much this would cost?

Also, the neighbour has already had this done (don’t want to ask them the cost as we don’t know them and don’t want to discuss this when we’re not even at the offer stage yet!), would this mean we might have trouble with planning permission, as the two converted garages would share a wall?

In the Gloucester area if that helps with pricing. Garage is 8ftx17ft.

Thanks for any help!

I converted mine a few years ago. It cost about £8k total but that didn’t include a bathroom as it was converted to a dining room.

Thanks needmore, did you need the same kind of work as I’ve described, aside from the bathroom? And was yours an integral garage, or was it exposed on one side (ours would effectively be a ‘terraced’ property, so no exposed walls).

I’m in the process of converting mine but into an office and utility room. It already has a radiator and plumbing though. The previous. The floor needs raising, steel beams boxing in, a partition putting up, the room plastered and the garage door removing and replaced with a window. I’ve been quoted £6.5k from the builder. but any plumbing and gas work (Moving sink & rerouting has pipework) is being done by my dads heating company. My dad said to budget £10k for the building works so was pleasantly surprised by this quote.

We only need building regs, not planning permission.

£17k

I'm in London looking to do similar and have been quoted so so much higher 😩

It was an attached garage so exposed walls. Needed everything you said apart from the bathroom and it also needed insulating and a door knocking through from the house.

To the 6/8.5k posters where are you based?

Yorkshire

Staffordshire

We’ve already got the door from the house.

My friend was quoted 8k for hers, we are Yorkshire. It came in at about 8.5k in the end. Hers was slightly different in that it was a det4cted newer build with integral garage.

They turned it into the kitchen and moved the house around a bit, so need most of what you are having done.

It’s a lot cheaper up here in Yorkshire!

did exactly that to ours (Shropshire) and it was about 6k

Ours was 17k which was eyewateringly expensive to me but DH was a nervous first time renovator so we went with a local package company and it did include taking out a load bearing wall/inserting a steel, planning consent (a requirement on our development) and making two rooms, one a utility with plumbing needing to be moved. If I’d DIY project managed and used local builders I would have expected to pay about 12-14. Surrey.

Thanks everyone that’s really helpful ☺️