Sandstone cleaning in the Eastern Suburbs
From Paddington terrace steps to clifftop walls in Dover Heights, the sandstone here is old, porous and easily damaged. We clean it slowly, gently and only after a test patch.
What grows on Eastern Suburbs sandstone depends on where it sits. Retaining walls on the shaded side of the Bellevue Hill and Darling Point ridges stay damp for days after rain and turn black with mould and grey with lichen. Gardens that back onto Cooper Park or Nielsen Park drop leaves that stain paving brown. Front walls on busy roads such as New South Head Road and Oxford Street collect a fine film of traffic grime. Closer to the water, salt deposits sit underneath all of it. Identifying which of these is on your stone matters, because the right cleaner for black mould is not the right cleaner for salt or soot.
Much of the sandstone in this region has already been cleaned badly at least once. We regularly see pale stripes left by pressure washers, and orange-brown blooms where a hydrochloric 'brick cleaner' has pulled iron out of the stone. Old terrace steps and footings in Paddington, Woollahra and Randwick are especially vulnerable because their faces are already weathered soft. Heritage NSW guidance for historic sandstone points toward the mildest effective treatment, beginning with plain water. Our technicians hold every property to that standard, listed or not, using a stone-safe biocide, time for it to work, and a low-pressure or hot-water rinse instead of a turbo nozzle.
The practical side of the work changes from suburb to suburb. Many harbour blocks fall steeply to the water, so hoses run long and wash water is bunded at the low point and vacuumed up. Paddington and Woollahra terraces often have no side access, which means carrying gear in through the front door, with hallway floors and door frames covered. Apartment buildings need access times agreed with the strata manager and paths kept open for residents. In every case the run-off is recovered rather than left to reach the gutter, plants and timber are covered or wetted down, and we finish by telling you whether a sealer is worth considering once the stone has fully dried.
See the full method on our sandstone cleaning page.
Sandstone cleaning & sealing by suburb
- Bellevue Hill
- Bondi
- Bondi Beach
- Bondi Junction
- Bronte
- Centennial Park
- Chifley
- Clovelly
- Coogee
- Darling Point
- Double Bay
- Dover Heights
- Edgecliff
- Kensington
- Kingsford
- La Perouse
- Little Bay
- Malabar
- Maroubra
- Matraville
- North Bondi
- Paddington
- Phillip Bay
- Point Piper
- Queens Park
- Randwick
- Rose Bay
- South Coogee
- Tamarama
- Vaucluse
- Watsons Bay
- Waverley
- Woollahra
Frequently asked questions
Straight answers from our stone-care technicians.
Can you clean sandstone in the Paddington or Woollahra conservation areas?
Yes, using low-impact methods suited to historic stone. Whether the work needs council approval depends on the property and on what is being done, so check with Woollahra Council, or the City of Sydney for southern Paddington, before any restoration. Gentle cleaning is the least invasive option available.
How quickly does mould come back on a south-facing wall?
On a shaded wall near bushland or the harbour, regrowth often shows within one or two years. Killing the growth at the root with a biocide extends that, and so does trimming plants that keep the wall damp. A breathable sealer or a maintenance plan can help on the worst walls.
Do you clean sandstone sea walls and waterfront steps?
We clean accessible waterfront stone where it is safe to work and where run-off can be contained. Stone in the wave zone is assessed on site. Cracking, leaning or undermining in a sea wall is a job for an engineer and a marine contractor; we point it out if we notice it.
Can you remove orange marks left by a previous acid clean?
Drawing the iron out with a poultice often fades them a lot, although deep marks may soften rather than go entirely. That is restoration work rather than cleaning, so we test it first and quote it separately with an honest expectation.