The houses that came with West Swindon's estates were frequently built with a garage at the side, and over the years many have gained a flat-roofed porch, kitchen extension or lean-to. Those small flat roofs tend to be the first parts of a house to need work, and the repair-or-replace question comes up often.
Q2.1When is a repair enough?
Where the fault is local, a repair makes sense. A seam that has opened, a cracked upstand against the house wall, or an outlet blocked with leaves and moss can usually be put right for a modest sum. Water often travels along the deck before it shows inside, so a mark inside the house may sit well away from the real opening. We trace it before we quote.
Q2.2When is a new covering the better spend?
If the surface is blistered over its whole area, the deck underneath feels soft, or the roof holds standing water because the falls are too gentle, patching is borrowing time. A new covering, in EPDM (a synthetic rubber membrane), GRP (glass-reinforced plastic) or felt, goes on a repaired and properly drained deck. For a new flat roof the design fall is 1:40 so that the finished roof still reaches at least 1:80.
What the work costs depends on the size, the access and the covering. MyBuilder's garage roof guide, updated on 21 August 2026, gives national typical figures for replacement, shown in the chart, and our written quote after the survey replaces them with a price for your roof.
Q2.3Which covering should I choose?
EPDM and GRP suit small, awkward roofs because each can be formed as a single sheet with very few seams. Felt remains a sound choice where it is laid well. Our flat roofing page compares them in detail.