What Is a Schedule of Quantities? A NZ Builder's Guide

If you've been asked for a "schedule of quantities" on a building project — or you've been told you need one before you can price a job — this guide explains what it is, what's in it, and how it works in the New Zealand construction context.

The short answer

A schedule of quantities is a document that lists and measures every item of work needed to build a project. It's organised by trade — concrete, framing, roofing, cladding, electrical, plumbing, and so on — and each item includes a description, a unit of measurement (m², m³, linear metres, or enumerated), and a quantity.

Its main purpose is to give builders and contractors a clear, measured basis for pricing. Instead of looking at a set of drawings and trying to figure out how much material you need, the schedule does that measurement for you. You just apply your rates.

Schedule of quantities vs bill of quantities — what's the difference?

In New Zealand, the two terms mean the same thing. NZS 4202 uses the combined term "Schedule (Bill) of Quantities" throughout. You'll hear "SOQ" and "BOQ" used interchangeably on NZ sites and in QS practice. Don't overthink it — same document, different name depending on who you're talking to.

What's actually in it?

A properly prepared schedule of quantities under NZS 4202 includes several key components. It starts with preambles at the beginning of each trade section that reference the contract conditions, specifications, drawings, the standard method of measurement, and any exceptional conditions. Every item is described with enough detail for a tenderer to price it — materials, dimensions, locations, specifications, and drawing references. Quantities are measured net (as fixed in place) and rounded to the nearest whole unit. Each item has a unit column so it can be priced, and rates are expected to cover labour, materials, waste, overheads, profit, establishment, and protection.

What trades does it cover?

NZS 4202 defines 38 trade sections. For a typical NZ building project, the relevant sections might include:

Not every project needs every section. A residential build under NZS 3604 might only touch 12–15 of these. A commercial fit-out might focus heavily on linings, electrical, HVAC, and fire protection. The schedule includes only the sections relevant to the project scope.

Why do you need one?

There are several practical reasons. For tendering, a schedule gives all tenderers the same measured basis, so you're comparing apples with apples. The builder applies their rates to the same quantities — the competitive element is pricing, not measurement interpretation.

For pricing your own work, even if you're not tendering competitively, a schedule gives you a structured breakdown of everything in the job. It's harder to miss something when every trade is listed and measured.

For contract administration, once the job is running, the schedule becomes the basis for progress claims, variation assessment, and final account. Under NZS 3910 and NZS 3916, the Schedule of Prices is a contract document — and quantities feed directly into it.

For cost control, the schedule lets you track actual costs against measured quantities throughout the build. It's the backbone of financial management on any properly run project.

How is it normally prepared?

Traditionally, a registered quantity surveyor measures the drawings by hand or using software like CostX, applying the rules in NZS 4202. This process takes days to weeks depending on project complexity, and typically costs $3,000 to $15,000+ in NZ.

The QS reviews the architectural, structural, and services drawings, extracts every measurable item, applies the correct units and measurement rules, and compiles the schedule organised by trade section. They also note assumptions, flag missing information, identify provisional sums for items that can't be accurately measured, and include contingency rationale.

What about provisional items and provisional sums?

NZS 4202 recognises that some work can't be accurately measured before construction starts. Provisional items are quantities that are estimated — the actual quantity gets measured on site as the work is done. Provisional sums are allowances for work that's defined but not yet designed or specified in detail. Both appear in the schedule with clear identification so everyone knows they're subject to adjustment.

How APEX BOS handles this

APEX BOS lets you upload your building plans — architectural, structural, civil, and services drawings — and generates a schedule of quantities structured by NZ trade divisions. The AI reads the drawings, extracts quantities in m², m³, linear metres, and unit counts, maps them to the correct trade sections, and outputs a professionally formatted document with measurement assumptions clearly noted.

It doesn't replace QS judgement on complex commercial projects — but for residential builds, fit-outs, and trade pricing, it gives you a measured starting point in hours instead of weeks, at a fraction of the cost of a traditional QS engagement.

Key takeaways

A schedule of quantities is the measured backbone of any NZ construction project. It's prepared in accordance with NZS 4202, organised by trade, and gives everyone — builders, contractors, QS professionals, and clients — a shared basis for pricing, tendering, and financial management. Whether you get one from a quantity surveyor or generate one from your plans using AI, having a properly structured schedule saves time, reduces risk, and keeps your project financially under control.