You Don't Need to Be a Contractor to Check Build Quality

Most buyers accept a new home based on a visual impression rather than a systematic quality check. The paint looks clean, the tiles are shiny, everything seems in order. But surface-level beauty and structural soundness are different things entirely — and the problems that surface years later are almost always signs that were already there at handover, just not noticed.

These checks don't require professional tools or expertise. They require patience, attention, and knowing what to look for.

Walls: What Cracks Are Normal and What Aren't

Not all cracks are created equal:

Hairline cracks (under 1mm) in paint or plaster: Common and generally cosmetic. Caused by paint drying or normal thermal expansion. Not a structural concern on their own.

Cracks wider than 2mm or that follow a staircase pattern on masonry: These may indicate differential settlement — different parts of the foundation moving at different rates. Worth flagging to the developer for explanation.

Diagonal cracks at door and window corners: Classic sign of structural stress concentration. These need professional assessment before acceptance.

Horizontal cracks in load-bearing walls: Potentially serious. Can indicate lateral pressure or inadequate reinforcement. Document and raise immediately.

Floor Quality Checks

The tap test for loose tiles: Knock lightly on each tile with your knuckle or a coin. A solid "thud" means good adhesion. A hollow ringing sound means the tile hasn't bonded to the substrate — it will eventually crack or lift. Every hollow-sounding tile in a new home is a legitimate claim against the developer.

Level check: Roll a marble across the floor, or use a simple spirit level. Floors that slope toward the walls rather than away from them will cause drainage problems and make furniture placement frustrating. A maximum tolerance of 3–5mm per 2 meters is the industry standard for interior floors.

Grout lines: They should be even width, fully filled, and free of gaps. Incomplete grout allows moisture ingress, which degrades tile adhesive over time.

Checking the Concrete Structure

You can do a basic assessment of reinforced concrete quality without lab testing:

Concrete cover: Where columns and beams are exposed (in a garage, for example), look for steel reinforcement bars close to the surface. There should be a minimum 40mm of concrete covering the steel. Exposed or near-surface rebar will rust and cause concrete spalling over time.

Honeycombing: Look for areas on columns or beams where the concrete has voids — small holes or porous patches. This happens when concrete wasn't properly compacted during pouring. It reduces structural capacity and allows moisture ingress.

Cold joints: Look for visible lines on concrete surfaces where one pour of concrete met another at a different time. These are acceptable if properly prepared, but visible separation lines warrant a question to the developer about the pour schedule.

Roof Structure

From inside the attic space (if accessible):

  • Check roof truss connections — bolts and fasteners should all be tight, no missing connectors
  • Look for light penetration other than at designed openings — any light means a potential water ingress point
  • Check for water staining on the underside of roof decking or on top-floor ceiling joists
  • Verify roof tile or panel coverage is complete with no gaps at edges, ridges, and valleys

Drainage and Waterproofing

Wet areas: Bathrooms, utility areas, and kitchens should have waterproofing membranes under the tile finish. There's no way to see these after tiling, but you can test them: fill the floor drain temporarily and let 5–10 liters of water sit for 30 minutes, then check the ceiling of the floor below for moisture. A brand-new bathroom that shows moisture penetration to the ceiling below has inadequate waterproofing.

Exterior water management: Water must drain away from the building, not toward it. Check that ground level slopes away from the foundation, and that any concrete apron around the building's perimeter is properly sloped outward.

Documenting What You Find

For every issue found, take:

  • A wide photograph showing where in the room the defect is located
  • A close-up photograph with something for scale (a coin, a ruler)
  • A brief description in writing: "Hollow tile — second row from door, 4th tile from left"

Submit these as a written defect list to the developer before signing the handover report. The developer's response to this list — whether they acknowledge the items and commit to repairs — tells you a great deal about the after-sales experience you can expect.