What affects the cost of remedial wall ties
The cost of remedial wall ties depends on the length of the wall, the number of failed ties, and how far the outer leaf has pulled away from the inner structure.
A 4-metre garden wall with 8 failed ties is a different job to a two-storey home where the entire front face has separated 15mm. The number of new ties, the drilling depth, and whether the wall needs pulling back before fixing all affect the price.
Cavity brick homes built between the 1950s and 1980s are the most common. The original galvanised ties corrode over time — 40 to 60 years is typical. By the time the outer wall starts leaning, most of the ties across that section have already failed. If you're seeing horizontal cracks or a wall pulling away from the roofline, those are signs of leaning walls. The cost of remedial wall ties for these homes usually sits in the middle of the approximate cost.
The alternative — knocking down the outer leaf and rebuilding — works. But rebuilding a cavity wall typically runs $15,000 to $40,000 depending on the area, the bricklayer, and how much scaffolding the job needs. Weeks of work. Remedial wall ties are a fraction of a rebuild, and the wall stays standing.