The specification

Introduction and method

In this series, we ask ChatGPT to review the published specifications of Australia's major project builders. This time it's Coral Homes, a privately owned Queensland builder established in 1990 and winner of the HIA Queensland Professional Major Builder award in 2020 and 2021. Coral offers single-storey, double-storey and acreage designs across Queensland and New South Wales.

A word on what this is and isn't. It's an AI-assisted review of Coral's published standard inclusions document, not of their homes, their workmanship or their customer service. ChatGPT isn't "unbiased"; it only knows what's in the document and what it has learned elsewhere, and it gets things wrong. I've condensed its output, corrected its errors in [square brackets], and added my own take at the end.

We followed the method set out in the first post of the series:

AI-Powered Builder Reviews Of Project Builder Specifications
Understanding builder specifications and inclusions lists can feel like solving a puzzle without knowing the rules of engagement. That’s why we’re launching a new series asking ChatGPT to provide clear, unbiased reviews of the major Project Builders.
Constructor - Build A Better New HomeAnthony Painter

Check out our original post about this blog series here. Get the Master Prompt and try it yourself.

C4 - Asking the Right Questions Checklist

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ChatGPT's quality review

Materials and fit-out

The specification leans towards cost-effective, mass-market inclusions:

  • Cabinetry: 32mm laminate benchtops in the kitchen, with 20mm Caesarstone only in the bathrooms. Stone in the kitchen is an upgrade.
  • Appliances: 600mm Technika appliances as standard; 900mm is a paid upgrade.
  • Sink and tapware: Clark sink and Phoenix or Caroma mixers. Serviceable, well-known brands at the entry level of their ranges.
  • Floor coverings: Not included in the standard inclusions, and marketing photos note that flooring shown is not standard. That's common for volume builders, but buyers need to know.
  • Shower screens: Fully framed as standard, with semi-frameless in the "Designer Deluxe" upgrade.

Structure

  • Timber frame is standard and described as "termite resistant". [ChatGPT guessed this means H2 blue-treated pine. The spec doesn't say. Ask which treatment is used, and note that a termite management system to AS 3660.1 is a separate requirement for the whole house, not just the frame.]
  • TRUECORE steel framing is available as an upgrade.
  • Slab: The base price assumes an 'S' class site (with 'M' class mentioned for Hervey Bay). Piers or a stiffer slab are only included if site engineering requires them, which is normal, but slab upgrades can be expensive, so get the soil test and engineering before you commit.

Value for buyers

ChatGPT's view: the inclusions are typical of a volume builder aiming to maximise perceived value at a sharp base price. Many premium-looking features are upgrades, and the $2,499 "Designer Deluxe" package is marketed as the way to get the "display home look". It found nothing deceptive, but the structure clearly relies on display homes to sell and upgrades to lift the contract value.

Omissions and red flags

  1. No waterproofing detail. Waterproofing is a high-risk area, and the spec doesn't name the system or reference AS 3740.
  2. Insulation and energy compliance. The spec lists R2.0 ceiling and R1.5 wall batts, with sarking and wall wrap "in specified regions". [ChatGPT claimed these batts are below NCC 2022 minimums and that Brisbane requires "R4.1 ceiling and R2.5 walls". That's misleading. Most Queensland homes comply with NCC 2022 through a 7-star NatHERS rating, which doesn't set fixed batt values; the energy assessment for your specific design sets the insulation, glazing and shading needed. A base spec with lower batt values may simply be upgraded once the assessment is done. Ask to see your energy report and check that the insulation in your contract matches it.]
  3. No acoustic insulation mentioned, for example around back-to-back bathroom walls.
  4. Basic electrical. Power and light point numbers are "home specific", there's one USB point, and no data cabling or smart-home prewiring.
  5. No reference to workmanship tolerances, such as the QBCC Standards and Tolerances Guide, for tiling, painting, cabinetry or slab flatness.
  6. No express builder warranty beyond the statutory protections. [In Queensland, those are the QBCC Home Warranty Scheme plus the 12-month defects liability period from practical completion in the standard contract. ChatGPT referred to "OFT", which is a NSW regulator.]

ChatGPT's language review

The spec is written in a consumer-friendly marketing tone rather than the precise language of the NCC and Australian Standards ("must", "not less than", "in accordance with AS..."). The phrases it flagged:

  • "Home specific" appears against splashbacks, overhead cupboards, baths, tapware, door types and even ceiling heights. It isn't defined, so you can't tell from the spec whether an item applies to your home.
  • "Region specific" appears against soft-close drawers, roof sarking and wall wrap, with no list of which regions get what. Sarking and wall wrap affect weatherproofing, condensation and energy performance, so they shouldn't be a mystery.
  • "Allowance made for" connection to services and building application fees. An allowance is not a guarantee of full coverage; if actual costs exceed it, expect a variation.
  • No performance standards referenced, such as AS 3740 (waterproofing), AS 2047 (windows), AS 4055 (wind classification), AS 2870 (slabs and footings), AS 1684 (timber framing) or AS/NZS 3000 (electrical). Coral must comply with these by law regardless, but the spec doesn't say so.
  • Brand names without model numbers, which leaves room for substitution within a brand's range.
  • "Designer" and "Deluxe" are marketing labels with no technical meaning.

ChatGPT's overall assessment: reasonable clarity for marketing, poor for contractual certainty.

ChatGPT's rating: 5 out of 10

ChatGPT rated the specification 5 out of 10: not a disaster, but not outstanding. Its reasons, limited to what the document shows:

  • Cost certainty: moderate to low. The base price looks competitive, but vague terms like "home specific", "region specific" and "allowance" create room for upgrades and variations, and the upgrade packages are clearly designed to upsell.
  • Quality and transparency: moderate. Inclusions are serviceable but entry-level, and the spec mentions no quality assurance system or workmanship standard.
  • Delivery on time: can't be judged from a specification. The spec gives no commitment on build times.

[The original version of this post repeated ChatGPT's comments about online customer reviews. We couldn't verify them, so they've been removed.]

Anthony's take

ChatGPT's main point is fair, and it applies to most volume builders, not just Coral: the specification is a sales document as much as a technical one. Coral has a long track record in Queensland and industry recognition, and plenty of people build with them happily. But the spec alone won't tell you exactly what you're getting.

If you're considering Coral, or any volume builder, here's what I'd do before signing:

  • Get "home specific" and "region specific" items confirmed in writing for your design and your lot.
  • Ask for your energy assessment and check the insulation, sarking, wall wrap and glazing in the contract match it.
  • Ask which waterproofing system is used and whether you can inspect the membrane before tiling.
  • Get the soil test and slab engineering before you commit so site costs don't surprise you.
  • Price the display home look properly. Walk the display with the inclusions list in hand and note everything that's an upgrade.
  • Check every "allowance" and ask what happens if actual costs exceed it.
  • Check the builder's licence and history on the QBCC website.

Our C4 Asking the Right Questions checklist (above) is built for exactly this conversation.

More builder reviews in this series

CMA Homes Builder Review By ChatGPTWe ask ChatGPT for its unbiased review of home builder CMA Homes. Read on to learn what it had to say.Stylemaster Homes Builder Review By ChatGPTWe ask ChatGPT for its unbiased review of home builder Stylemaster Homes. Read on to learn what it had to say.Creation Homes Review By ChatGPTWe ask ChatGPT for its unbiased review of home builder Creation Homes. Read on to learn what it had to say.Brighton Homes Review By ChatGPTWe ask ChatGPT for its unbiased review of home builder Brighton Homes. Read on to learn what it had to say.Burbank Homes Builder Review By ChatGPTWe ask ChatGPT for its unbiased review of home builder Burbank Homes. Read on to learn what it had to say.Balance Design & Construction Review By ChatGPTWe ask ChatGPT for its unbiased review of home builder Balance Design & Construction. Read on to learn what it had to say.