What a renovation or extension actually costs.

Real numbers for homeowners renovating or extending — the cost ranges, the hidden traps in an older home, and how to read a builder's quote. Written by a licensed builder, not a marketer. No sales pitch.

The real cost ranges for a renovation or extension in 2026 — by project and by room.

The hidden costs only old homes have — restumping, rewiring, damp, asbestos — with the figures to budget for them.

How to read a quote like a builder — spot the low number that blows out, and what to check before you sign.

A worked budget example so you can see where every dollar of a real renovation goes.