At a glance

Rule of thumb:the midpoint of your inspector's defect repair-cost estimates is the floor of your negotiation ask. On a $1M–$1.5M Australian property with typical pre-purchase findings, buyers negotiate $15K–$80Koff contract price using documented inspection evidence. Negotiate in dollars (not vague "the place needs work") and back every number to a page in your inspector's PDF.

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Your building inspection report came back. It's 95 pages. There's termite evidence, a cracked slab edge, deteriorating mortar, and the electrical isn't to current spec. What number do you put on all that?

Most Australian buyers either don't negotiate (leaving $20–80K on the table) or pull a number out of thin air (which the vendor's agent shoots down). Here's how to do it properly.

Step 1: Classify every defect into a negotiation bucket

Your inspector's defects fall into three negotiation tiers:

Tier A — Hard negotiation items

  • Safety + structural Major Defects classified per AS4349.1 — termite damage, foundation movement, structural cracking, roof framing failure, asbestos in deteriorated condition.
  • Code non-compliance — electrical without RCDs, smoke alarms not interconnected, balustrade height < 1m, stair tread compliance.
  • Items the inspector explicitly says require specialist further investigation — these often hide bigger costs than the inspector can quantify.

Tier A items demand specific dollar negotiation backed by inspector evidence. Vendors expect to compensate or rectify these.

Tier B — Maintenance backlog negotiation items

  • Deferred painting (especially exterior on timber clad homes)
  • Hot water service / gas heater near end-of-life
  • Tile-roof restoration overdue
  • Original electrical wiring (pre-RCD) needing safety upgrade
  • Gutter / downpipe replacement overdue

Tier B items individually look small. Bundle them. Three Tier B items × $4K each = $12K of negotiation room hidden as "just maintenance."

Tier C — Vendor will push back hard

  • Cosmetic items — paint touch-ups, sealant gaps
  • Wear and tear on fittings the vendor isn't replacing
  • Anything "you knew this when you offered"

Tier C items are real but vendors will refuse to discount on them. Use them as throwaway gives — drop them in the negotiation in exchange for a bigger concession on Tier A.

Step 2: Put a dollar figure on every Tier A + Tier B item

Your inspector probably WON'T have given you costs (AS4349.1 doesn't require it). You need to do this yourself OR use a tool like Report Decoded that estimates AU repair costs by defect category.

Some rough Australian benchmarks for typical Tier A defects:

  • Termite treatment + AS3660 management plan: $3K–$8K
  • Termite structural damage repair: $5K–$30K depending on extent (joists / studs / wall plates affected)
  • Re-stumping a Queenslander / Victorian cottage: $15K–$32K
  • Slate roof restoration: $25K–$50K
  • Colorbond roof replacement: $18K–$28K
  • Tile-roof restoration (point + paint): $4K–$10K
  • Rising damp DPC injection (per affected wall): $3K–$8K
  • Structural underpinning (front porch / corner): $15K–$30K
  • Foundation engineer's structural report: $1.5K–$3K
  • Asbestos removal (kitchen / bathroom sheeting): $1.5K–$6K
  • Electrical safety upgrade (full house RCDs): $1.5K–$3K
  • Interconnected smoke alarms (per home): $400–$900
  • Hot water service replacement (gas / electric): $2K–$4K
  • Hydronic / ducted heating service or replace: $3K–$15K

These are 2025–2026 Australian rates. Coastal properties + heritage properties typically run 1.5x–2x higher because of corrosion-grade materials + heritage-spec replacement rules.

Step 3: Build your negotiation number

Add up all Tier A items at the midpoint of each repair-cost range. Add 50% of your Tier B total (vendor will haggle you down to roughly half). This is your starting ask.

Example: $750K Yarraville cottage with deferred maintenance:

  • Termite treatment + 5-yr plan (Tier A): $5K midpoint
  • Fungal decay on weatherboards (Tier A): $20K midpoint
  • Foundation underpinning at front porch (Tier A): $22K midpoint
  • Asbestos eaves removal (Tier A): $3K midpoint
  • Electrical safety upgrade (Tier B): $2.5K × 0.5 = $1.25K
  • Tile-roof restoration overdue (Tier B): $7K × 0.5 = $3.5K
  • Exterior repaint overdue (Tier B): $15K × 0.5 = $7.5K

Starting ask: $62,250 off contract price. Realistic landing: $40K–$55K.

Step 4: Write the actual negotiation letter

The vendor's agent will assess your seriousness by HOW you present the negotiation. Two emails get totally different responses:

"The inspection came back with a few issues. We'd like to negotiate $50K off."

vs:

"Following the AS4349.1 inspection completed [date] by [Inspector Pty Ltd, licence #1234], the following major defects were identified on pages 12, 18, 24, 41, 52, 67, and 81 of the attached report: [bulleted list with estimated repair costs]. Total documented rectification cost is $62,250. We are formally requesting a price reduction of $50,000, bringing our offer to $700,000. We are in a position to exchange promptly if we can reach agreement."

The second one gets taken seriously. Report Decoded auto-generates this letter from your inspection PDF, including the page citations. Copy-paste-send.

Step 5: Know your walk-away number

Before you send the negotiation letter, decide: what's the LOWEST discount you'll accept and still proceed? What's the maximum rectification cost you'd swallow personally to get the property?

Most buyers fail here. They negotiate from emotion ("we love this house") without setting a walk-away. Vendor smells it and refuses. Set the line BEFORE you negotiate.

Tips that matter

  • Always negotiate via the agent in writing. Email beats text beats phone call. Creates a paper trail and forces the agent to relay your number accurately to the vendor.
  • Don't reveal your walk-away. Lead with your starting ask. If the agent says "the vendor won't move," counter once at a lower number — don't collapse to your walk-away on the first push-back.
  • Cite specific inspector pages, not vague defect categories. "Termite damage in roof void (p. 47)" beats "structural issues."
  • Use cooling-off / pre-exchange period. Your contract probably gives you a window. Negotiate INSIDE that window so "walk away" is a real option.
  • Don't apologise. The defects are documented. You're not being difficult; you're being a normal buyer with eyes open.

What about new builds (PCI / handover)?

New-build practical completion inspections work differently. You're already in contract with the builder. You don't negotiate price down — you require the builder to rectify the defects before sign-off, using the Defects Liability Period (DLP) clause in your contract.

Report Decoded generates a Builder Rectification Letter instead of a Negotiation Letter when you select "new build / handover" at upload. It cites every defect against the relevant Australian Standard breach so the builder can't hand-wave away items.

One more thing

The single most common mistake: buyers either don't negotiate at all (leaving $20K–$80K on the table on a typical $1M+ purchase) or they negotiate too aggressively without evidence (vendor refuses, buyer either capitulates or walks).

Evidence-led negotiation almost always wins. Your inspector did the hard work — finding the defects. Your job is to translate that into a dollar number, document it, and put it in front of the vendor in a way they can't dismiss.

That's exactly what Report Decoded does in 2 minutes for $39. But even if you do it manually using this guide, the principle is the same: specific defects + specific pages + specific dollar amounts = serious negotiation.

Common questions

How much can I usually negotiate off a contract price after a building inspection?
Typical Australian negotiation ranges by property type: pre-1940 character homes with deferred maintenance: $30K–$80K. Post-war brick veneer (1950s–80s) with maintenance backlog: $10K–$30K. Modern (post-2000) home with minor defects: $3K–$15K. New build at PCI: builder rectifies under contract rather than buyer negotiating off price. Coastal / heritage properties scale higher.
Can I walk away from a contract if the building inspection is bad?
Depends on your contract. Most Australian standard contracts include a Building Inspection clause giving you a cooling-off / pre-exchange window to walk away if the inspection finds significant defects (often defined as costing > $X to remediate, typically $5K–$20K threshold). Read your specific clause + check with your conveyancer. Cooling-off periods vary by state.
What's the difference between a "Major Defect" and a "Minor Defect" in terms of negotiation?
Major Defects (safety, structural, or significant expenditure) are the primary negotiation drivers — vendors usually expect to compensate or rectify these. Minor Defects (cosmetic, maintenance, wear) are still legitimate negotiation items in aggregate but vendors push back harder on each one individually. Bundle minors into a single capex-backlog number rather than itemising.
Should I ask the vendor to FIX defects or just take money off?
Almost always take money off rather than asking the vendor to fix. Vendor-arranged rectification work is rarely done to your standard, often uses cheapest-trade-available, and you have no recourse if work is poor. Take the dollars and arrange your own trades post-settlement — exactly to your specification.
My agent said the vendor won't negotiate. Now what?
Three options. (1) Walk away if you have a cooling-off / inspection clause and the defects exceed your tolerance. (2) Stick to your number and let the vendor decide whether to take a lower offer now or risk re-listing. (3) Use Report Decoded's ready-to-send negotiation letter — citing the inspector's PDF pages directly puts the vendor in a harder position because the evidence is documented.
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