Sandstone Restoration
Sandstone restoration is about saving the stone you already have. We repair, repoint in lime mortar and clean old sandstone walls, steps and buildings so they last another lifetime, without the shortcuts that do more harm than good.
In short
Sandstone restoration is the repair of old stonework: raking out failed or cement joints, repointing, gentle low-pressure cleaning and cutting in matched new or recycled stone where blocks have decayed. Older sandstone should be repointed in a breathable lime mortar softer than the stone, because hard cement mortar forces moisture and salts through the sandstone and makes it crumble.
Northern Beaches Stone restores sandstone walls, stairs, houses and garden stonework across the Northern Beaches and the North Shore. We repoint in lime mortar, clean stone without damaging the surface, replace decayed stones with matched new or recycled sandstone and seal where it helps. Worn old sandstone stairs are a common job too: see sandstone steps. Much of it is heritage stonework on older homes, so we work the way a heritage stonemason should: like-for-like stone, breathable lime mortar and the least intervention that does the job.
We are often asked to restore old sandstone stairs, and it is some of the most satisfying work we do: worn steps cleaned up, re-bedded and repointed can look close to new while keeping their age and character.
Raking out failed or cement joints and repointing in a breathable lime mortar that suits the stone.
Gentle, low-pressure cleaning that removes dirt, mould and staining without stripping the stone face.
Cutting out decayed stone and setting in new pieces of matched or recycled sandstone.
Re-bedding loose treads, replacing broken stones, repointing and cleaning old sandstone steps.
Sandstone wall repairs: rebuilding bulging or collapsed sections of sandstone walls, reusing the original stone where it is sound.
Breathable penetrating sealers on steps, paving and coping where sealing will help the stone.
Sandstone holds and releases moisture, and salts carried in that moisture crystallise where it dries. In a wall built with soft lime mortar, the joints do most of the drying, so the salts and decay end up in the mortar, which is cheap to replace. Hard cement mortar is less permeable than the stone, so water is forced out through the sandstone instead, and the edges of each block flake and crumble.
That is why we repoint older sandstone in lime mortar, mixed to be softer and more breathable than the stone. For most Sydney sandstone built before about 1920, lime mortar is the standard heritage advice.
High-pressure washing, sandblasting and acid cleaners strip the outer face of sandstone and open it up to faster weathering. We clean with low-pressure water, soft brushes and stone-safe products, and use poultices for stubborn stains.
Not every old wall should be sealed. On walls with rising damp or salt problems, a sealer can trap moisture and make decay worse. On steps, paving and coping we use breathable penetrating sealers that reduce water and stain uptake while letting the stone dry.
Restoration work is hard to show in a single photo, and we have fewer restoration photos than new builds. The gallery shows weathered rubble walls and hand-dressed sandstone of the kind we repair and match, rather than before and after shots. Ask us and we can talk you through similar jobs.
Recent sandstone restoration by our team. Tap a photo to see it larger.
How we work
We inspect the stone, mortar, drainage and any heritage listing, and explain what is causing the damage.
We agree the repair method and, for heritage items, work with your heritage adviser and Council.
We remove failed mortar, cut out decayed stone and set in matched indents or replacement stones.
Joints are repointed in lime mortar, finished to match the original pointing.
We clean the stone gently and seal steps or paving where it will help.
Restoration is quoted after we have seen the stone, because the extent of damage is hard to judge from photos. These are the main things that affect the cost.
Work to a heritage item, or to some properties in a heritage conservation area, usually needs Council consent under the local environmental plan. Some minor repairs and maintenance can go ahead without consent if Council agrees in writing beforehand that the work is minor. If your property is listed, we can work with your heritage adviser and provide the method details Council needs.
Sandstone usually crumbles or flakes because of salt attack, where salts carried by moisture crystallise in the stone as it dries. Hard cement mortar makes it worse by forcing moisture out through the stone instead of the joints. Coastal salt air, rising damp and poor drainage are common causes on the Northern Beaches. Finding the moisture source is the first step in any repair.
For older and heritage sandstone, use a breathable lime mortar that is softer than the stone. Lime mortar lets the wall dry through the joints, so salts and decay go into the mortar, which can be replaced. Cement mortar is harder and less permeable, which forces moisture through the sandstone and damages the edges of each block over time.
Yes. Old sandstone can be cleaned safely with low-pressure water, soft brushes, stone-safe cleaners and poultices for stubborn stains. High-pressure washing, sandblasting and acid cleaners strip the surface of the stone and speed up weathering, so we avoid them. A gentle clean removes dirt, mould and staining while keeping the stone's face intact.
Work to a heritage-listed sandstone wall in NSW usually needs Council consent under the local environmental plan. Some minor repairs and maintenance can proceed without consent if Council confirms in writing beforehand that the work is minor. On the Northern Beaches, check with Council first, and we can work with your heritage adviser on the repair method.
Yes. We cut out decayed sandstone and set in indents or full replacement stones cut from matched new or recycled sandstone. Recycled stone has already weathered, so it often blends better with old Sydney sandstone walls. We match colour, grain, size and tooling, then repoint the joints in lime mortar to suit the original.
The cost of sandstone repointing depends on the area, joint depth and width, the mortar type, how much cement has to be raked out, access and any stone replacement. Heritage work may also need specific methods. We quote each Northern Beaches and North Shore job after an inspection, so call 0414 319 536 for a free assessment.
In NSW a retaining wall needs no approval only if it meets every exempt standard in the Codes SEPP: generally no more than 600 mm of cut or fill, at least 1 m from any boundary, 2 m from other retaining walls, 40 m from natural water, not on a heritage item and not redirecting water. Anything else needs a CDC or a DA with Northern Beaches Council.
Read the guide
Seal sandstone with a breathable penetrating (impregnating) sealer, not a film-forming coating, so moisture and salts can still escape. Clean the stone with a pH-neutral cleaner, let it dry fully, test a patch, then apply as the manufacturer directs. Do not seal walls with rising damp, salt problems or old lime-mortar heritage work.
Read the guide
Yes, sandstone can work around a saltwater pool, but only with a dense, good-grade stone, a breathable penetrating sealer suited to pools, regular fresh-water rinsing and joints softer than the stone. Salt crystallising in the pores is what causes flaking. If you want lower maintenance, travertine or bluestone may suit better.
Read the guide
Sandstone entry steps, garden stairs, block steps and curved staircases, built with even rises and solid footings.
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Sawn and rock-face sandstone block retaining walls, built on solid footings with proper drainage for Northern Beaches slopes.
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Natural sandstone cladding for facades, feature walls, columns, chimneys, window surrounds and subfloors, fixed for coastal weather.
Learn moreWe work across the Northern Beaches and North Shore.
Tell us what you have in mind. Blake will talk it through, visit the site and give you a clear written quote.
