Roof repairs in the Inner West: find the leak, then fix it

Start with the stain, not with the roof

Most calls begin the same way: a brown ring on a ceiling, a damp patch down a chimney breast, or paint lifting off a cornice. That mark tells us where the water came out. It rarely tells us where it got in.

Water on an Inner West roof travels. It runs along a rafter, crosses a ceiling joist, and finds the first crack in the plaster — which might be three metres and one room away from the actual failure. So the first job is tracing it back, not sealing the nearest suspicious-looking thing.

Call (02) 8000 1103 and describe what you are seeing. The inspection is free.

The five leak paths we find most across these suburbs

1. The box gutter outlet and sump

Terraces, semis and shopfront residences drain through a box gutter between parapets, into a sump, and out through one downpipe. On a Class 1 dwelling that gutter is sized for the 1% AEP five-minute rainfall burst, with a minimum 200 mm flat base and a 30 mm freeboard allowance for wind-driven spill. There is not much spare capacity in that design.

Block the sump with leaf litter, or lose 10 mm of fall to a century of settlement, and the water backs up over the rear of the gutter — straight into the roof cavity. Many older gutters also have no independent overflow discharging to atmosphere, which is now standard practice under AS/NZS 3500.3, so there is no safe release valve.

2. Parapet cappings and through-wall flashings

A parapet is a brick wall standing above the roof, wet on three sides. The capping on top cracks, the old damp-proof course has long since failed, and water soaks down inside the brickwork. It then exits wherever the wall is weakest, often at a window head on the floor below. This gets misdiagnosed as a window leak constantly.

3. The party-wall junction with next door

Where your roof meets the neighbour's, there is one flashing serving two houses. Over decades it has been patched by different trades with different materials, and the silicone holding it together has gone hard and shrunk. Fixing it properly sometimes means working from the roof next door. We sort the access question out before quoting.

4. Slipped and delaminating slate

Victorian slate was fixed with iron nails. When the nails corrode the slate slides out, one at a time, usually landing on the footpath. The slate is often still sound — the fixing is not. Individual slates can be cut and hooked back in. If nail failure has spread across a whole slope, you are into a re-slate conversation.

5. Chimney stacks and lead aprons

There are thousands of original chimneys across Newtown, Stanmore, Annandale and Balmain, many no longer in use. The stack brickwork is porous, the lead apron at its base has lifted, and the flue is open to the sky. Water comes down the inside of the stack and shows as a damp chimney breast indoors.

On the Federation and inter-war half of the area

Not every roof here is attached. Across Strathfield, Burwood, Concord, Haberfield, Summer Hill and Croydon the stock is detached Federation and inter-war brick with real eaves. Those roofs leak in more conventional ways:

• Ridge pointing crumbling so water tracks under the caps
• Valley irons rusted through where leaf litter has sat wet for years
• Cracked and chipped tiles from foot traffic, antenna installs and tree limbs
• Sarking absent entirely, which is normal on anything pre-1960
• Eaves gutters rusted at the joints or hung with no fall

Those are usually accessible, lower-risk repairs. See roof restoration if the whole roof is tired rather than specifically broken.

What a repair visit looks like

1. Inspect and trace. Roof surface, box gutter, sump, flashings, parapet, penetrations. Internally where it helps — a look in the roof cavity often settles the question in two minutes.
2. Explain it to you. In plain terms, with photos of what we found, including the things we looked at and ruled out.
3. Make safe if water is still entering. Covering, temporary diversion, clearing a blocked outlet.
4. Written quote. The repair itemised, with access and any permit requirements included in the number.
5. Do the work and clear up. Debris removed, gutters cleared on completion.

If the inspection shows the roof is past patching, you will be told that rather than sold three more repairs. Roof replacement covers what that involves.

What moves the cost of a roof repair

There are no fixed prices, and anyone quoting one over the phone has not seen your roof. What genuinely changes the figure:

• Access. Zero setback to the footpath, no side path, a 1.2 m rear lane, two storeys. Scaffolding and a footpath occupation permit are real line items in parts of Balmain, Rozelle and Newtown.
• Roof pitch and material. Slate needs different handling, different fixings and more care underfoot than concrete tile.
• How far it has spread. A split lining is cheap. A split lining that has rotted a wall plate and a ceiling is not.
• Matching materials. Finding slate or terracotta tile to match a heritage roof takes longer than pulling a sheet of Colorbond off a rack.
• Heritage controls. Inside a conservation area the covering, profile and colour may be constrained, which limits the cheap options.

You get all of that written down before anything starts. Nothing proceeds on a handshake and a guess.

Where we repair

Repairs run right across the 29 suburbs on our list — the terrace belt through Newtown, Enmore and Balmain, the Federation and inter-war middle through Haberfield and Burwood, and the Cooks River suburbs at Earlwood and Tempe. The full list is on the service areas page.

Book a free leak inspection

Work is carried out by established, licensed and insured roofing contractors working to NSW Fair Trading requirements, and completed repairs carry a written workmanship warranty.

Call (02) 8000 1103 or send the details through. No pressure, no obligation.