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Up-and-over metal doors typically last 25-35 years before needing replacement. Most UK garage stock was built in the 1960s-70s, so a lot of doors are due. £450-650 per door, £1,800-2,600 if you're buying a block of 4. Always factor this into your bid.
Pre-1985 garages frequently have corrugated asbestos sheet roofs. Removing them legally requires a licensed contractor — £1,200-2,500 per garage. Look for the tell-tale wavy grey panels before you bid.
Concrete floors poured in the 1960s without modern damp-proof membranes can let moisture rise. £250-500 per garage to treat properly. If you see efflorescence (white salt deposits) on walls or floor, budget for it.
For an average garage purchase you should typically budget 10-20% of the purchase price as a renovation reserve. So a £20,000 garage should have £2,000-4,000 in reserve for first-three-year capex. If actual quotes come in higher than that, the deal probably isn't as good as the headline yield suggests.