Hiring a building consultant: inspections, reports and when you need one

What building consultants actually do

The bread-and-butter job is the pre-purchase inspection: a visual check of a home before you buy, covering the structure, roof space, subfloor and obvious defects, delivered as a written report within a day or two. Most buyers bundle it with a timber pest inspection, which is nearly always cheaper than booking the two separately.

Beyond that sit the specialist reports. Handover inspections catch defects in a new build before you make the final payment. Dilapidation reports document the condition of your home before neighbouring construction starts, so any damage can be proven later. And detailed defect reports — photographed, room by room — support disputes with builders, sometimes all the way to a tribunal. A consultant is different from a building certifier or surveyor, who approve work against the building code; the consultant works for you, not the approval process.

What the reports tend to cost

A standard pre-purchase inspection usually sits in the hundreds, with the building-and-pest bundle a little above it. Property size, extra storeys and granny flats add inspection time, and same-day or pre-auction turnaround usually carries a premium.

Detailed defect and dilapidation reports are a different tier — often well into four figures — because the consultant documents everything methodically rather than scanning for major issues. Expert witness work for tribunals or court is charged at professional hourly rates and costs the most. All figures are indicative; the report type and the property drive the quote.

Choosing a consultant worth listening to

Licensing varies by state — in some states building inspectors must hold a licence or registration, in others the industry is effectively unregulated — so do two checks regardless of where you live: a background as a licensed builder or equivalent qualification, and current professional indemnity insurance. The insurance matters because a missed defect can cost you the price of the report a hundred times over.

Ask what the report covers and, just as importantly, what it excludes — restricted roof voids and subfloors limit any visual inspection. A good consultant is happy to take your call after you've read the report and explain what's cosmetic, what's urgent and what's a negotiating point. A report that arrives as an unexplained template with checkboxes is worth much less than one written about your actual building.

Mistakes to avoid

The most expensive mistakes with building consultants are the reports people don't get, and the reports they get but don't read. Both are avoidable.

• Skipping the inspection to keep an auction bid competitive — that discount can buy a lot of repairs
• Booking building and pest separately when a bundle is cheaper and better coordinated
• Choosing the cheapest inspector without checking insurance and qualifications
• Making the final payment on a new build before a handover inspection — you lose your leverage
• Not getting a dilapidation report before major construction starts next door
• Reading only the summary page and missing the exclusions and access limitations