Hi Mickey, I don't think it is really an 'expense'. You'd estimate the value at when it was introduced to the business and capitalise it. Then it would be subject to the Capital Allowances provisions. Last time I did a similar thing, the allowance was 4% a year Industrial Buildings allowance, but check that is still the case.
I suppose one way of valuing it would be to divide the cost by the expected life in years then deduct a proportion according to how long it has been standing.
Garages normally cost anywhere between 8-18k 'as a garage' (when you look at new houses and estates thats the going rate, also dependant on area) so have a look around and see if you can find a 'value' for said building then apply the methods Don talks about.
I think they mean a 'home' garage, not a commercial one Liz :D (but along the same lines... Give the council a ring they may be able to help with prices for rentals in that area (if they have any).
