Why three remedial scopes for the same building look nothing alike

A Lane Cove strata committee sends the same brief to three remedial builders. Three scopes come back, and they read like three different jobs. Same building, same balcony program, same brief. The committee assumes the shortest scope is the lean option and the longest is the careful one. The committee assumes wrong. The length of the document tells you almost nothing. What each contractor diagnosed, and chose to address, tells you everything.

Why three scopes for one building diverge

Remedial work is not commodity work. Three contractors looking at the same balcony can scope three genuinely different jobs depending on how deep they looked and what they decided to fix. The divergence reflects three different diagnoses, not three margins on the same diagnosis.

The shortest scope is a topical recoat. It addresses the surface and nothing under it. The middle scope is a partial membrane replacement at the visible failure points. The longest scope is a full membrane replacement across all balconies with concrete cancer rectification at the slab edges. Three different work packages, because three different contractors looked at the same symptom and stopped at three different depths.

The four things that make the scopes differ

First, the membrane specified. A 2003-spec acrylic recoat and a 2024-spec liquid-applied polyurethane to AS 4654.2 are both called waterproofing. Only one is built to last on an exposed balcony. A scope that names neither the standard nor the product could be installing anything.

Second, the access strategy. One scope includes scaffold, one assumes swing-stage, one assumes the balcony is workable from inside the apartment with protection of finishes. The swing-stage option can look leaner until you notice it omitted the engineer's report required for swing-stage on that elevation.

Third, the warranty. One scope carries a ten-year manufacturer warranty plus the six-year statutory defects liability under the Home Building Act. Another carries a twelve-month workmanship warranty and nothing on the membrane. A scope that carries a real warranty is carrying a real obligation behind it. Fourth, the depth of the diagnosis. A contractor who lifted tiles at three points and ran a hammer-tap survey found things the contractor who walked the deck for forty minutes did not. The deeper diagnosis produces the longer scope, because it found more of the actual defect.

How to actually read them

Three checks. Do them in this order.

Check 1: are all three scoping the same work

Open the scope of works document attached to each. If there is no scope document, just a single line, that one cannot be read at all, request a scope. Then compare line items. Supply and install waterproofing membrane to balconies is a different work package to lift tiles and bedding to all ten balconies, remove existing membrane to substrate, correct falls with new screed where required, install two-coat liquid-applied polyurethane membrane to AS 4654.2 with reinforcement fabric to all junctions, flood test before tile reinstatement, reinstate tiles to match. One is a sentence. The other is a method.

Check 2: does each reference the AS code, the manufacturer, and the product

A defensible scope names the standard the membrane will be installed to (AS 4654.2 for external above-ground, AS 3740 for internal wet areas). It names the manufacturer, names the product within that range, and states the application thickness or coat count. A scope that says waterproofing membrane with none of that detail is not a specification. It is a placeholder.

Check 3: does the warranty term match

The manufacturer's warranty on materials. The contractor's workmanship warranty. The statutory defects liability period (six years for major defects in NSW under the Home Building Act for residential work, two years for non-major). A scope that compresses all of this into twelve months guarantee is offering a different product to one that runs ten plus six.

What a real external-diagnosis scope includes that a surface scope omits

The difference between a surface scope and a remedial scope is the diagnosis behind it. A surface scope starts at the stain and works on what is visible. A real external-diagnosis scope starts at the outside of the building and works backward to where the water is actually entering.

That means a documented site walk with the date and the access points. Tile lifts or render cuts at the failure points, not a visual from the ground. A moisture map that traces the water from the apartment ceiling back to the entry point. A hammer-tap survey across the element to find the drummy concrete the eye cannot see. A cause statement per defect, not a symptom list. The AS code the rectification will comply with, per defect. The materials specified by manufacturer and product. The sub-scopes the diagnosis surfaced, such as a concrete cancer sub-scope at a slab edge that has been wet for years. A surface scope omits all of it, because it never looked past the stain.

What to do next

• Send the 7-line brief to three remedial builders. See how to scope a remedial quote so the strata committee can defend it for the brief.
• When the scopes come back, read the diagnoses before anything else. What did each contractor actually find, and how did they find it.
• If one scope is markedly leaner, identify exactly what it left out, then decide whether the building genuinely needs what the deeper scopes added.
• Take all three scopes into the OC meeting. The committee defends the decision better when they see the comparison, not just the recommendation.

How Supcon handles this

Supcon's scope is built on the diagnosis. The site walk is documented with a date. The tiles or render come up at the failure points. The moisture map traces the water to source. The scope names every line, specifies materials to manufacturer and product, cites the AS code per defect, and states the warranty term upfront.

If the committee receives a much shorter scope from a maintenance contractor, the difference is almost always in the diagnosis, not the margin. Read the two side by side and the call gets easy. See reading a remedial scope of works for the twelve-line checklist that makes any scope readable.

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