Garage conversion - how much?

[weakestlink]

If you have had your garage converted how much did it cost and whereabouts are you in the UK?

We would like to convert single, detached garage into a guest bedroom and ensuite and storage cupboard. Average finish, not basic, not "luxury". As far as I can gather, we would not need PP as this would fall under "permitted development" so just need to get building regs.

Haven't had it done but have been doing a bit of research as been considering it myself v a loft conversion. Reckon garage about 10k, loft about 35k...

NonnoMum exactly what I am doing. We would also get more space in the garage than the loft and I figure less disruption as well....

Ours cost a total of about £8,500. We had a double integral garage converted into a second sitting room plus utility room and storage cupboard. For that price, we also had an oak floor. We had to get planning permission plus Buildings Regs consent; the planning permission was needed because of the area where we live.

We're in the East Midlands.

Anyone else done this?