What documents does a quantity surveyor actually need?

Published 2026-07-26 • Structmate

The most common reason a quantity surveyor's fee comes in higher than expected, or accuracy comes in lower, is incomplete documentation. Here is what actually gets used, ranked by how much difference it makes.

Essential

Architectural drawings

Floor plans, elevations, sections and a site plan, at readable scale with dimensions. This is the backbone of the measurement. PDFs are fine; scaled and searchable PDFs are better; native CAD is best but rarely necessary for residential work.

Make sure the set is complete and consistent. A set missing sheet 4 of 9 will generate a query before anything else happens.

The drawing register with revision numbers

This one sounds administrative and is genuinely important. Measuring Revision C while you tender Revision E is a costly and entirely avoidable mistake. Send the register, and tell us which revision is current.

Substantially improves accuracy

Structural drawings and engineering details

Footings, slabs, beams, columns, and reinforcement schedules. Without these, concrete volumes and reinforcement tonnages are estimated from typical construction for the type and location — usually within range, but an assumption rather than a measurement, and it will be marked as such.

Specification

What things are made of and to what standard. Two walls of identical area can differ substantially in cost depending on what is specified.

Finishes schedule

Which finish goes where, room by room. Without it, finishes are measured as a single assumed type across each area, which is fine for a rough figure and not fine for a tender.

Window and door schedules

Sizes, types, glazing and hardware. These can be measured off elevations if necessary, but the schedule is faster and more reliable — and glazing is expensive enough that guessing is not sensible.

Useful where they exist

• Hydraulic, mechanical and electrical drawings — required if services are to be measured rather than allowed for
• Geotechnical report — drives site classification, footing design and excavation, and can move earthworks quantities significantly
• Survey and levels — essential for cut and fill on any sloping site
• Landscape drawings — otherwise external works becomes a provisional sum
• Development consent conditions — these sometimes impose real cost, such as tree protection, acoustic treatment or specific materials

What happens when things are missing

Nothing dramatic, and the job does not stop. Missing information is handled in one of three ways, and a good bill tells you which applies to each item:

1. A stated assumption. Measured on a reasonable basis, with the basis written down so you can check it against reality.
2. An RFI. Where the answer materially changes quantities, it goes into the query list rather than being assumed.
3. A provisional sum. Where the scope genuinely cannot be measured, an allowance is carried and clearly marked as such.

What should never happen is a silent guess dressed up as a measurement. If a bill does not tell you where its assumptions are, that is a warning sign about the bill, not a sign the project was well documented.

A short checklist

Before sending drawings for a quote, check you have: the full architectural set at current revision, the drawing register, structural drawings if issued, the specification, finishes and window schedules if they exist, and a note of what you are pricing for and when it is due. If half of that is missing, send it anyway — you will get an honest read on what the gaps mean rather than a request to come back when you are better organised.