Heritage and protected masonry cannot be repaired like modern brickwork. The materials are different — soft handmade bricks, sandstock, lime-based mortars — and so are the rules. Get the mortar wrong, and a repair that looks fine on day one will spall the surrounding bricks within a few seasons. Get the approvals wrong, and the owners corporation is exposed to a breach of its heritage obligations. Sensitive masonry repair is as much about restraint and compatibility as it is about workmanship.
The most common damage on older Sydney buildings is a legacy of past over-hard cement repointing. A cement mortar is stronger and less permeable than the soft brick around it, so moisture is forced to escape through the brick face instead of the joint — and the brick spalls. Salt attack, corroded ties, and rising damp compound it. In coastal suburbs the salt loading is heavier again, and heritage fabric that has stood for a century is far less forgiving of the wrong intervention than modern masonry.
At Atomic Projects, we repair heritage and matched masonry using compatible materials and methods that respect the original fabric and the conservation controls that protect it. Our work follows AS 3700 — Masonry Structures alongside the conservation principles of the Burra Charter and the guidelines of the Heritage Council of NSW, and we align our approach with the building's Conservation Management Plan and any conditions on its heritage listing.
How We Approach Heritage and Matched Masonry Repair
- Significance and Approvals Review — We establish the building's heritage status and controls, review any Conservation Management Plan, and confirm what approvals are required. We prepare the documentation to support a heritage application and coordinate with the consent authority and heritage consultant before works begin.
- Material and Mortar Analysis — We test and characterise the existing bricks and mortar for composition, strength, and porosity. This determines a repair mortar — typically lime-based — that is deliberately softer and more permeable than the masonry, so moisture escapes through the joint and not the brick face.
- Sourcing Matched Materials — Replacement units are sourced to match the originals in size, colour, texture, and firing, using reclaimed and reproduction heritage bricks and matched stone through our supply chain. Sample bricks and mortar mixes are submitted for approval.
- Approved Test Panels — Before any full-scale work, we build test panels of the proposed bricks, mortar, joint profile, and any cleaning method, and obtain sign-off from the heritage consultant or authority. Nothing proceeds until the panel is approved.
- Careful Removal and Hand-Finishing — Deteriorated units and failed pointing are removed by hand to avoid damaging sound fabric, cutting out old cement pointing without widening the joints. Repointing and rebuilding is hand-finished to replicate the original joint profile and coursing.
- Gentle Cleaning and Reversibility — Where cleaning is approved, we use the gentlest effective method rather than aggressive abrasion or high-pressure water. Interventions are kept sympathetic and, where practicable, reversible, in line with conservation best practice, and the works are documented for the building's records.
Frequently Asked Questions
Our building is heritage-listed — do we need approval before doing masonry repairs?
In most cases, yes. Works to a heritage-listed or conservation-area building usually require approval, and the type of consent depends on the listing and the scope. We assess the controls, prepare the supporting documentation, and coordinate with the heritage consultant and consent authority so the owners corporation is not exposed to a breach.
Why can't we just use standard bricks and cement mortar?
Because they are harder and less permeable than heritage fabric. A cement mortar traps moisture and forces it out through the soft brick face, which then spalls — so a modern repair can actively damage a heritage wall. We match a softer, more permeable lime-based mortar and matched units so the wall behaves as it was designed to.
Can you actually match century-old bricks and mortar?
Yes. We source reclaimed and reproduction heritage bricks and matched stone, and design the mortar mix and joint profile to suit. We prove the match with approved test panels before full works, so the committee and the heritage consultant can see the result before committing.
How do you protect the original fabric during the works?
Deteriorated units and old pointing are removed by hand to avoid disturbing sound masonry, cleaning is done by the gentlest effective method, and interventions are kept sympathetic and reversible where practicable. The aim is to conserve as much original fabric as possible, in line with the Burra Charter.
How is heritage masonry repair funded and approved by the owners corporation?
Heritage masonry repair is building-envelope remediation and is typically funded from the capital works fund. Because it carries approval obligations, we provide a scope, preliminary cost assessment, and the approvals pathway together, so the owners corporation can plan levies and pass the necessary resolutions with the full picture.
Related Services
Heritage masonry repair often runs alongside other remedial work on the same fabric. We routinely combine it with brick replacement and repointing, render repairs and reinstatement, and efflorescence and damp treatment, all delivered under the brickwork and render repairs program.
Ready to protect your heritage masonry the right way? Atomic Projects is a Class 2 Registered Builder with 10+ years of remedial masonry experience across Sydney's heritage, strata, and commercial building sectors. Contact us to arrange a heritage condition survey and repair quote.
📞 Call Us: 0410 515 509
✉️ Email Us: hello@atomicprojects.com.au
— Ben Tran, General Manager, Atomic Projects
