The honest answer to 'what will this cost' is: it depends on what a proper survey finds, not on square footage alone.
We're not going to put a rate card on this page, and there's a specific reason for that: two terraces of identical size, in the same building, can need genuinely different scopes of work depending on the condition of the substrate underneath, how many junctions and penetrations there are, and whether the failure is confined to the membrane or has already reached the structure below.
What drives cost more than area
Substrate condition is usually the biggest variable — a sound, dry base costs far less to waterproof than one that needs preparation, patching or partial reconstruction first. Access matters too: a ground-floor compound wall and a fortieth-floor terrace parapet are different jobs to mobilise for, independent of square footage. And the number of junctions — where a terrace meets a parapet, where a pipe penetrates a slab, where two different roof levels meet — tends to predict labour far more accurately than raw area does, because junctions are where waterproofing systems actually fail.
What a free site visit actually gets you
Before any number gets quoted, the site visit exists to answer the substrate and junction questions above — so that a quotation reflects an actual diagnosed scope rather than a per-square-foot estimate that either overcharges a straightforward job or undercharges one that turns out to need more preparation than expected.
For managing committees specifically
Where the work is being procured through a society's general body, a written scope tied to a specific survey gives committees something concrete to put in front of members and compare against other quotations — rather than comparing bare numbers that may not be scoped the same way at all.
Akolkar R&D can resolve the leakage issue successfully — reach out to us.