The short answer
Some small jobs are reasonable to do yourself: checking the roof from the ground, clearing low gutters from a secure ladder, and noting where water is getting in. Anything that means standing on the slope, lifting tiles, dressing lead or working at height is unsafe for most people and often false economy, because a bad patch hides the fault and lets damage spread.
The jobs that are reasonable to do yourself
The most useful thing a homeowner can do for a roof is look at it, and nearly all of that can be done with both feet on the ground. Walk round the house after heavy rain with a pair of binoculars and look along the ridge, the lines of the hips, and the joints beside chimneys. Slipped or missing tiles show as gaps or as a ragged edge in an otherwise even slope. Moss lifting at an edge, a gutter hanging open, or a line of dark staining on a wall below the eaves all tell you where to start looking.
Inside, a torch in the loft is safe if you stay on the joists or a boarded area. Look for damp patches on timber, daylight through the covering, and wet insulation. Photographs taken now, with dates, help a roofer and help an insurer later.
Clearing a gutter on a single-storey extension from a properly footed ladder, with someone holding the base, is a reasonable job. Blocked outlets push overflow back towards the eaves, where it soaks the timber beneath the first row of tiles. If the gutter is high, the ladder cannot be tied off, or the ground is soft, leave it for someone with the right access equipment.
Why working on the roof itself is a different matter
Falls from roofs and ladders cause serious injuries, and the risk is not worth a saving of a hundred pounds or so. A pitched roof wet with dew or moss is slippery even in dry weather. Slates and old clay tiles break under a boot, and a broken tile on a leaking roof is a bigger repair than the one you set out to do. Roofs also hide weak spots: a rotten batten, a thin patch of lead, or a skylight pane that cannot take weight.
A roofer working at height normally has scaffold, edge protection or a roof ladder, and has learned how to move across a particular covering without cracking it. That equipment is a large part of what you pay for, and it is the part a homeowner cannot easily borrow for an afternoon.
If a job needs you to step off a ladder onto the slope, stop. Lifting a tile to see what is under it, pushing a slipped slate back, or climbing to a chimney to look at the flashing all fall into this group. Flashing, the metal weathering that seals a roof against a wall or stack, looks simple from below and rarely is.
False economy: patches that hide the fault
The usual DIY repair is a tube of sealant, a roll of self-adhesive flashing tape, or a smear of bitumen over a crack. These can stop a drip for a few weeks. The trouble is that they treat the place water appears, not the place it gets in. Along a rafter or beneath a tile, water may wander some distance before a ceiling shows it, so the patch goes on the wrong spot, the leak carries on, and the timber behind it stays wet.
Sealant over lead is a particular problem. Lead moves with temperature, and a hard bead of sealant restricts that movement, so the lead splits beside it. A roofer then has to clear away the old material before doing the repair properly, which costs more than it would have done originally.
Cement used to bed tiles or fill a ridge has a similar effect on older roofs. It is rigid and heavy, and it traps water against softer materials such as lime mortar or stone. On a listed or period house it can do lasting harm. If you are unsure what a material is, do not cover it with something else.
Roof windows, flat roofs, asbestos and other no-go areas
Some areas are best treated as off limits. Old cement sheet garage and outbuilding roofs may contain asbestos. Handling or breaking it releases fibres, and removal has rules about how it is handled and disposed of, so leave it alone and have it tested. The HSE publishes guidance on asbestos for householders.
Flat roofs, lead gutters, parapet gutters and valleys all rely on falls and lapped joints that are difficult to judge by eye. Parapet gutters sit behind the raised wall at a roof's edge, while valleys are the internal angles where two slopes come together. Both carry a great deal of water, and a poor repair shows up in the first heavy storm.
Chimney work and anything near electrical cables, such as a service line fixed to the eaves, also belong with a professional. Bats are legally protected, and so are their roosts, so a roof showing signs of them needs particular care.
What a roofer does that a patch cannot
A roofer starts by finding where the water actually enters. That can mean following staining back through the loft, checking the underlay, and looking at the lead and mortar around the area as well as the slipped tile above the stain. Our article on how a roof leak travels explains why the drip on the ceiling is rarely under the hole.
The repair is then done with the same type of material as the roof, using like for like, slate for slate and clay for clay. Corroded fixings are replaced, and the work is tidied so it does not create a new weak line. If the survey shows the roof is close to worn out, the photographs show it, and we would rather tell you than fit a patch that cannot last.
Before you call, note when the drip appears, whether it follows heavy rain or wind from one side, and where the stain sits on the ceiling, as that narrows the search on the roof. MyBuilder's 2026 cost guide puts minor jobs, a handful of tiles or a minor drip, at roughly £100 to £300 across the UK, which is often not much more than a failed DIY attempt followed by a proper repair.
Deciding between a DIY check and a call
A simple test helps. If the job can be done from the ground or a secure ladder at a low eave, and nothing is leaking indoors, it is reasonable to try. If water is coming in, if the fault is on the slope, near lead, or near a chimney, or if you cannot reach it without leaving the ladder, ask for a survey.
For the signs that should prompt that call, see the signs a roof needs repair. For a wider view of what a repair involves, our roof repair guide goes through the stages. Phone 01225 285181, use WhatsApp or the enquiry form, and tell us if water is already coming in, because we prioritise those calls. The wider picture is on our roof repairs in Bath page.
