Exterior Trim near you

Approved Document 7 is short and unusually readable, and its logic applies directly to trim. It treats a material's expected life against the expected life of the building, and then asks whether the thing can be got at. A painted bargeboard reached from a ladder every seven years is a different proposition from the same board at the apex of a three-storey gable where redecorating means a scaffold, and that is why the second one is so often replaced in a material that does not need painting.

The same document notes that there are no provisions under the building regulations for continuing control over materials after the work is finished, but that under section 19 of the Building Act 1984 a local authority may impose conditions on the proposed use of prescribed short-lived materials even where the plans conform to the regulations. It then records that no materials are currently prescribed for that purpose — so this is a framework rather than a live restriction, and the reason to know about it is the thinking it encodes rather than any prohibition it imposes.

The second limb of regulation 7(1), in a workmanlike manner, is the one that decides whether trim lasts. End grain sealed before the piece goes up, fixings set below the surface and stopped, joints designed to shed water rather than to look neat, a drip formed under a projecting moulding, and a gap left where timber meets masonry so the two are not permanently wet against each other: none of that shows in a photograph, and all of it is the difference between fifteen years and five.

Trim is one of the few parts of a house where piecemeal repair is usually better than replacement. Decayed sections of a moulding can be cut back to sound timber and a new piece spliced in and matched, and ornate work can be consolidated and rebuilt with repair compounds rather than lost. On a period elevation that is the right answer twice over, because the original profiles are often unavailable and a replacement run in a modern approximation reads wrongly across the whole front of the house.

Full replacement earns its place when decay is general rather than local, when the fixings have nothing sound to hold, when the profile is plain enough to be reproduced convincingly, or when the position is so inaccessible that the honest question is what will still be there in twenty years. That last case is where the short-lived materials logic bites: a piece you cannot reasonably maintain should be specified to need less maintenance.

Whichever route is taken, deal with the cause first. Trim rots because water is arriving and not leaving: a blocked gutter above it, a missing drip, a cill without a fall, a downpipe throwing water across it, or a coat of paint applied over damp timber that sealed the moisture in. Renewing the piece without fixing that simply resets a clock.

Paint on exterior trim is a weather barrier with a decorative side effect, and it is redecorated before it fails rather than after. Once a coating has cracked, water enters at the crack, travels behind the film and is then held against the timber by the very coating that was protecting it. A piece redecorated on cycle can last generations; the same piece redecorated once the paint is flaking has already taken the damage.

The places to look first are the ones nobody looks at: end grain at the cut end of a bargeboard, the underside of a cill and its drip, the top edge of a projecting moulding, the base of a porch post where it meets the step, and the back face where trim touches masonry. Those are where the coating fails first and where the decay starts. Approved Document C's parallel instruction for the fabric around them is worth borrowing: it asks for particular care in detailing and workmanship at the junctions between cladding and window and door openings because they are vulnerable to moisture ingress.

The practical arrangement for most houses is to inspect annually from the ground, deal with local failures as they appear, and plan a full redecoration around the access rather than around the calendar. If a scaffold is going up for roof or gutter work, that is the moment to do the trim, whether or not it is quite due.

Trim work is priced on access, on how much has to be made rather than bought, and on preparation. The variables are the height and how the piece will be reached, how much of the run is being spliced rather than renewed, whether profiles have to be machined to match an original, the material and coating system specified, how much decayed timber is found once the paint comes off, whether the fixings and the substrate behind are sound, and whether the work is part of a larger decoration or a single element on its own. Matching an ornate Victorian bargeboard is joinery; replacing a plain square-edged one is carpentry, and the difference shows in the figure.

LokalMatch makes the introduction and does no more than that. Describe the pieces once with your postcode, with photographs if you have them, and say how high they are and whether the building is listed — then joiners, carpenters and decorators covering your area get in touch. Posting a request is free for homeowners, because it is the pros who pay for the requests they receive. LokalMatch does not carry out the work, does not set prices and does not vet, rank or recommend anyone, so agreeing the profile, the material and how much decay is included before the ladders go up is your part of the job.