Will Matchett Talks About Ten Mistakes That Quietly Wreak A Custom Home Build
- Will Matchett

- Jul 2
- 6 min read
"Most of the things that go wrong on a custom home build do not announce themselves at the time". Director Will Matchett Begins. "They show up months later as a delay, a variation, or a finished home that doesn't quite work and by then they are expensive to fix and impossible to undo".
"Let's talk about the ten most common — and most costly — mistakes that derail otherwise good projects in Toowoomba and the Darling Downs".
"And I'll say most are avoidable with decisions made before the slab goes down".
"So let's start with Picking the cheapest quote without comparing what's actually included".
"On a custom build, three quotes for the same project will often vary by hundreds of thousands of dollars".
"The cheapest is rarely the best deal". Will saids firmly.
"It's usually the one with the most provisional sums, the lightest inclusions, and the most cost overrun built into the back end".
"Now before comparing prices, compare what's in each quote".
"What's a fixed price? What's a Prime Cost (PC) sum, and at what allowance?"
'Also what's a provisional sum, and what's it covering?"
"A quote that's all fixed price is either fictional or heavily padded, and a quote that's mostly PC and PS sums is unsigned exposure".
"Ask each builder to walk you through the same line items in their quote, side by side, and the gap closes fast".
"Next, setting a build budget but no project budget!"
"So from experience in the industry, I have come accross that most homeowners will set a build budget — the figure on the building contract — and assume that's the project cost. It isn't".
"The full project cost includes: site works and earthworks (often higher on Toowoomba range or rural blocks), driveways, retaining walls, fencing, landscaping, window furnishings, light fittings beyond builder's allowance, appliance upgrades, pool or shed, council fees and headworks, soil and engineering reports, certifier fees, and a 10% contingency for variations".
"On a $1.2 million build, the project budget is rarely under $1.4 million by the time the family moves in".
"A budget that doesn't account for that gap is the single biggest source of stress during construction".
"Now treating the floor plan as a layout problem instead of a lifestyle problem".
"The plans that work best are not the ones with the prettiest elevations".
"They're the ones designed around how the family actually moves through a Tuesday.
"Where do bags land at 3:30?, Where does homework happen while dinner's cooking?, Who works from home and where do they actually focus?, Who's the early riser and where do they go without waking the house?".
"If the answers to those questions weren't part of the design brief, the floor plan is solving for the wrong problem".
"A 280m² home designed around how you live works harder than a 380m² home designed around what looked good on Pinterest".
"So Ignoring orientation and getting energy performance for free".
" As most local people know, Toowoomba has cold winter mornings, hot summer afternoons, and meaningful seasonal sun angle changes, a well oriented home — living areas and main bedroom facing north, with eaves sized to block summer sun and admit winter sun — costs roughly the same to build as one that gets it wrong, and costs significantly less to run for the next forty years".
"Matchett Constructions understands all of this, being a local business".
"The Nationwide House Energy Rating Scheme (NatHERS) sets a 7-star minimum for new homes nationally, hitting 7 stars is achievable through orientation, insulation, glazing, and sealing — without expensive add-ons — if it's designed in from the start. Retrofitting any of it after slab is poured is exponentially more expensive".
" Next we talk about finalising selections after construction starts". Will Continues.
"Tile selections, tap ware, joinery handles, splash back, paint colours, light fittings — every one of these has a deadline that aligns with a trade arriving on site".
:Miss the deadline and the trade either stops, works around it (often badly), or works on someone else's job and comes back when you've decided".
"The fix is to finalise every selection before site works begin, and to lock variations to "in writing, signed off, before work proceeds."
"A variation register reconciled at every progress claim is non-negotiable".
"We'll sort it out at the end" is how a $1.2 million build becomes $1.4 million with no clear paper trail.
"Let's talk about designing for the moment instead of the trajectory".
"For Example, a home designed for a family with two primary-school kids is not the same home that family needs in ten years".
"Custom builds get this wrong constantly — designed for how you live now, not how you'll live when the kids are seventeen, when one parent works from home permanently, or when an ageing parent moves in for six months".
"The questions worth answering at design stage: will the kids' bedrooms still feel like rooms when they're seventeen? Where do parents actually escape to? If a home office becomes permanent, where does it go?".
"The honest answer to most of these is "we'll deal with it when it happens." That's the version of the house that gets renovated within a decade".
"Moving on to, underestimating storage at the design stage".
"Not enough storage, is the single most common regret in post-occupancy reviews of custom homes. It's also the cheapest thing to get right — and the most expensive to retrofit".
"The storage that matters: a real walk-in pantry with bench space, not a glorified cupboard".
"A laundry sized to fold, hang, and sort — not a corridor with a washing machine in it, a mudroom or drop zone where bags, boots, and sports gear live without taking over the rest of the house".
"Linen, broom, vacuum, and hallway storage in dedicated locations, garage storage built in, not added later as wire shelving".
"Add it up at design stage, cutting it back in the kitchen plan to save $8,000 is a decision you'll regret every day the house exists". Will explains.
"Another mistake is forgetting Toowoomba weather when designing outdoor living".
"An alfresco area that works in coastal Queensland — open, breezy, lightly screened — does not work in Toowoomba, right?".
"The winter mornings sit below 5°C, and Summer storms bring lateral rain and hail".
"The wind off the range in August is a real factor as well".
"Outdoor living that gets used year-round in Toowoomba needs: a roof, not a pergola; cafe blinds or sliding screens for winter; an outdoor heater or fireplace if you want it usable in July; flooring that handles temperature swings without cracking; and orientation that accounts for the prevailing wind".
"A standard Brisbane-spec alfresco gets used three months of the year. A Toowoomba-spec alfresco gets used twelve".
"Next, going generic on materials in places that show wear fast".
"Cheaper finishes on a feature wall or accent piece are recoverable".
"Cheaper finishes on the surfaces that get used every day — kitchen benchtops, flooring in main traffic zones, tap ware, door hardware, the front door — show their age within five years".
"The rule: spend on the surfaces and components that take daily use, such as the kitchen tap is touched 30+ times a day; cheap chrome will pit and the cartridge will fail".
"Engineered timber floors in main traffic zones show scratches a tiled or hardwood floor wouldn't". "Cheap door hardware feels cheap every time you touch it, and one of these are the line items where the savings should come from".
"Lastly, treating the builder relationship as transactional".
"A custom build runs 9 to 14 months, and during that time, the builder is making hundreds of decisions on your behalf — small ones daily, big ones weekly".
"The relationship is not a one-off transaction; it's a sustained working partnership, well I like to think". Saids Will.
"Builders who treat clients as transactions cut corners when they think no one's watching".
"Clients who treat builders as transactions miss the chance to flag concerns early, when they're cheap to fix".
"The best projects come from a working relationship where both sides communicate openly, trust each other's judgment, and address issues as they emerge — not at the end".
"Ask, before you sign: who is my point of contact? How often will we meet on site? What's the process when something goes wrong?".
" The answers tell you what the next twelve months will feel like".
"So really, What this comes down to?".
"Most of these mistakes share a common cause: decisions made too late, or not made at all".
"A well-run custom build front-loads the decisions — design, selections, budget, scope — so that by the time site works begin, the project is solving execution problems, not design problems".
"If you're at the early stage of planning a custom home, renovation, or extension in Toowoomba or the Darling Downs and you'd like to talk through any of the above against your specific project, feel free to contact us directly."
"Matchett Constructions has been building across the region for years. Trust The Experts".
"The first conversation is at our cost".
QBCC licence 15266551.





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