What is a square metre? A homeowner's guide to area pricing

The basic calculation

Measure the length of the space, measure the width, multiply. A bedroom 4 metres long and 3.5 metres wide is 14 square metres (written 14 m²). For an L-shaped or odd room, split it into rectangles in your head, calculate each, and add them up.

For walls (painting, rendering, tiling), it's the same idea stood upright: wall length times wall height, minus big openings like windows and doors if you want to be precise — though painters often ignore small openings since the cutting-in around them takes as long as painting them would.

Typical square-metre jobs

Expect area-based pricing for:

• Flooring of every kind — timber, laminate, carpet, tiles
• Painting (often converted from floor area for whole-room quotes)
• Turf and lawn — instant or seeded
• Concreting slabs, paths and driveways
• Rendering and cladding walls
• Roofing, per square metre of roof area (which is bigger than your floor area — pitch adds surface)

Why quoted quantities differ from your measurement

Tradies add a wastage allowance — typically 5 to 10 per cent for straightforward layouts, more for diagonal patterns, patterned tiles that need matching, or rooms with lots of angles. Materials are also sold in fixed pack sizes, so a 14 m² room might genuinely need 15.4 m² of boards purchased.

That's not padding; it's how the materials actually get bought. What you're checking is that the allowance is reasonable, not that it's zero.

Use your number as a sanity check

Once you know your area, every quote becomes checkable: divide the total by the square metres and compare the effective rate across quotes and against QuickQuote's cost guides. Rates vary with materials and site conditions, but you'll spot an outlier instantly.