PaintersUpdated May 2026 · 5 min read

How to Quote Interior House Painting: A Tradie's Guide to Accurate Pricing

Learn how to quote interior house painting jobs accurately for Australian homes. Get expert tips on materials, labour, and common pitfalls to ensure profitable projects.

First Things First: Measuring Up and Assessing the Job

When tackling an interior house painting job, getting your measurements spot-on is critical for an accurate quote. Don't just eyeball it; grab a laser measure. Calculate the total wall surface area by multiplying the perimeter of each room by its height. Subtract areas for windows and doors, but remember, cutting in around these adds labour. Always factor in the ceiling area separately. This initial assessment is where you'll figure out how to quote painting interior house work effectively, laying the groundwork for all material and labour costs. Pay attention to the condition of existing paint; flaking or peeling surfaces mean extra prep. A standard three-bedroom house might have around 250-300 square metres of wall surface, plus 80-100 square metres of ceilings, before subtractions.

Material Costs: Picking the Right Paint, Primer, and Prep Gear

Material costs make up a big chunk of any painting quote, so choose wisely. For most interior walls, a good quality low-sheen acrylic is a safe bet, like Dulux Wash&Wear or Taubmans Endure. For wet areas like bathrooms and laundries, specify a semi-gloss mould-inhibiting acrylic. Don't forget primer pricing; it's essential for new plasterboard, repairs, or significant colour changes. A 10-litre tub of quality primer like Dulux Professional Total Prep typically covers around 120-140 square metres, costing about $130-$160 from Bunnings. Paint coverage rates usually sit around 14-16 square metres per litre per coat for good quality paint. A standard 15-litre drum of premium interior paint often costs between $200-$280, depending on the brand and finish. Factor in consumables like masking tape (FrogTape is excellent), drop sheets, sandpaper, rollers, and brushes, which can add $50-$100 per room.

Labour Costs: Pricing Your Time for Profit

Your labour is your most valuable asset, so price it correctly. For interior painting cost Australia wide, many tradies charge per square metre, ranging from $10-$25/sqm for walls and ceilings, depending on complexity and prep. Alternatively, a daily rate for a skilled painter might be $450-$650, excluding GST, plus an apprentice rate if applicable. Don't forget prep time; filling holes, sanding, and masking can easily take 20-40% of the total job time. Cutting in around skirting boards, architraves, and windows demands precision and time. A typical three-coat system (primer, two topcoats) doubles or triples your application time. For a standard internal door, expect to allocate 1.5-2 hours for preparation and two coats of paint, including drying time between coats.

Hidden Variables and Contingencies: What Can Go Wrong

Every painting job has its unknowns. Always build in a contingency. Older homes often hide plaster damage, excessive nail pops, or water stains that require extra repair and sealing. Access can be tricky; high ceilings or awkward stairwells mean hiring scaffolding or specialised ladders, adding to your costs. Protection of existing furniture and flooring is non-negotiable and takes time. Don't forget waste disposal for empty paint tins and soiled drop sheets. Consider potential variations; if a client changes their mind on colour after the first coat, that's extra labour and paint you need to charge for. For guidance on managing variations, check out your state's fair trading guidelines, like those found on the NSW Fair Trading website: www.fairtrading.nsw.gov.au/trades-and-businesses/construction-and-trade-essentials/changes-to-your-contract. Always include a line item for a 10-15% contingency for unforeseen issues.

Crafting a Professional and Transparent Painting Quote

A clear, detailed quote builds client trust and protects your bottom line. Break down your quote into specific line items: surface preparation (sanding, filling, cleaning), primer application, specific wall painting (e.g., 'Master Bedroom Walls - 2 coats'), ceiling painting, trim painting (skirting, architraves), and doors. List material brands and colours where possible. Clearly separate labour and materials, or provide an all-inclusive price with a detailed breakdown attached. Always include GST as a separate line item. Specify your payment terms (e.g., 20% deposit, progress payments, final payment on completion) and a validity period for the quote, typically 30 days. Using an app like QuoteMate makes it easy to generate branded PDF quotes with all these details, keeping everything tidy and professional.

Common Mistakes that Can Cost You on Painting Jobs

Underestimating prep time is the biggest pitfall. Skimping on sanding, filling, and priming leads to a poor finish and client complaints, ultimately costing you more in callbacks. Another common mistake is not accurately calculating paint quantities, leading to costly last-minute trips to Bunnings or Reece. Always factor in drying times between coats, especially in humid conditions; rushing this leads to adhesion problems. Not specifying the exact paint finish (e.g., matte, low-sheen, semi-gloss) can also lead to miscommunication. Finally, not clearly outlining what's *excluded* from the quote, such as minor plaster repairs beyond a certain size or moving heavy furniture, can cause disputes. A clear scope prevents arguments later. Always add a margin of at least 25% to your base costs to cover overheads and profit.

Pro Tips

Always inspect the site for existing damage or tricky access before quoting.
Use a laser measure for accurate wall and ceiling areas, then calculate paint coverage rates.
Factor in at least 20-30% of your total labour for preparation work alone.
Specify paint brands and colours in your quote to avoid client confusion and changes.
Add a 10-15% contingency to your total for unexpected issues.
Always charge for primer; it's essential for a quality, lasting finish and significantly impacts primer pricing.
Clearly state your payment terms and the quote's validity period.
Review your labour rate every 6-12 months to match rising costs and market rates.

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