Provisional sums and PC items — where a fixed-price quote isn't fixed

Two line items hide most of the cost surprises in a Sydney residential build. What they are, why they exist, and how to read them before you sign.
Vol. I · No. 09 · Tuesday 2 June 2026
A Varloch Group publication. Technical writing on residential construction — drainage, structure, sequencing, contracts, and what every homeowner should know.

Two line items hide most of the cost surprises in a Sydney residential build. What they are, why they exist, and how to read them before you sign.

NSW's Low and Mid-Rise Housing reforms now permit dual occupancies on most R2 lots over 800 m² across the Northern Beaches, and a consolidated council DCP is due mid-2026. Here's what changes for a homeowner sitting on a typical block.

Spec-builders quote piling on coastal sites the way they quote it on flat suburban blocks. The number isn't comparable, and the gap is where most coastal projects blow their budget.

New builds hold construction moisture. As it dries, timber and plaster move slightly. What's normal, what isn't, and what to do about each.

Most expensive structural problems on a residential build start as a drainage issue left alone for two years. How to keep water moving right.

Trees, garden beds and overwatering are the three most common ways homeowners damage a building they paid a lot of money to construct. Short version.

A residential build is a long financial relationship. The fortnightly claim is where that lives. What a good claim contains — and what to push back on.

A companion piece to /our-process. What happens between the first phone call and the first day on the tools — and why we structure it.

On a tight Sydney site, basement excavation often means underpinning a neighbour's footings. The sequencing isn't optional. How we approach it.