Bellevue Hill has two neighbourhood heritage conservation areas under Woollahra Council’s development controls: Aston Gardens and Victoria Road, with Balfour Road straddling the Rose Bay border. The houses in them are largely face brick, often with terracotta roofs, sandstone bases and timber joinery.
The controls are specific about brick. Woollahra’s DCP for neighbourhood heritage conservation areas states that painting, bagging or rendering of original face brickwork is not to occur, and encourages reinstating face brick where it has been painted.
That rule shapes how the brick should be maintained.
Cleaning is maintenance, and it is allowed
The controls protect the finish. Washing original brickwork to remove dirt, biological growth and staining does not change it, and maintenance and restoration are explicitly contemplated. What you cannot do is solve a stained wall by painting over it.
Which makes the cleaning method matter more. A damaged face cannot be hidden under paint in a conservation area. If it is etched, eroded or blotched by the wrong treatment, that damage is what the house wears.
What goes wrong on old face brick
High pressure. Federation and Inter-War bricks have a hard fired skin over a softer body. A pressure wand takes the skin off, especially at the arrises and on the softer bricks in a wall, and the exposed body then erodes and absorbs water. The damage is permanent.
Acid. Hydrochloric acid brick cleaner is the default for new brickwork. On old walls it attacks lime mortar, can leave white or green staining, and burns sandstone sills and bases next to the brick. It is the commonest cause of the blotchy, bleached brickwork seen on older houses.
Repointing in the wrong mortar. Not cleaning, but usually discovered at the same time. Hard cement mortar in a wall built with lime forces moisture to leave through the bricks rather than the joints, and the bricks fret.
What works
A test patch on an inconspicuous section first. Low pressure with plenty of water and a soft brush. Biological growth treated with chemistry and dwell time rather than force. Efflorescence, the white salts on the surface, brushed off dry rather than washed in. More: why we always do a test patch and efflorescence on brick.
Look at the base of the wall before anything else. Sandy orange grit collecting at the bottom means the brick faces are fretting from salt moving through the wall, which is a damp problem, not a dirt problem. Washing makes it worse. More: brick fretting and rising damp.
Previously painted brick
Some houses in the area had their brick painted before the controls existed. Council encourages reinstatement, but stripping paint from old brick is specialist work: the wrong stripper or method destroys the face it is meant to reveal. Test small areas, accept that some bricks will not come back cleanly, and talk to council’s heritage officer before committing.
Sandstone, terracotta and timber
The same controls require replacement materials to match, timber for timber and terracotta for terracotta, and protect sandstone walls, fences, kerbs and gutters. Cleaning any of these follows the same principle: low pressure, no acid, test first. More: cleaning in heritage conservation areas and cleaning heritage homes in the Eastern Suburbs.
If you are unsure whether your property is in a heritage conservation area, a section 10.7 planning certificate from council will say. For the rest of the year’s maintenance, see the Bellevue Hill maintenance calendar.
