A scaffolding estimate is the difference between a job that pays and one that bleeds money for weeks. Most scaffolders learn estimating by osmosis, copying whoever priced the last job, and inherit the same blind spots. This walkthrough sets out how to estimate a scaffold properly, from measuring the scope to protecting your margin.
Start with the scope, not the price
Estimate what you are actually being asked to build, not what you assume. Read the enquiry, the drawings and the specification. Measure the scaffold: linear metres, number of lifts, height, and the features that change everything, such as cantilevers, beamed spans, loading bays, fans and sheeting or netting. The most expensive estimating mistake is pricing a job you never fully scoped.
Labour and materials
Materials come off the design: tube and fitting or system, boards, ties and fittings, plus an honest allowance for everything tied up on site across the hire period. Labour is the erect and dismantle hours, the gang size, the access difficulty, and how long the scaffold stands, because a scaffold that stands for months carries inspection and adaptation labour the short jobs do not.
Remember what scaffolding actually sells. It earns over time. Price the weekly hire and the expected duration honestly, because that is where the real money is, not in the erect alone.
Dayworks versus measured rates
Know the difference, because it decides whether variations pay you or cost you. Measured rates price the finished scaffold per metre or per item. Dayworks price time and materials when the scope is not fixed. Pricing a variable, changeable job on measured rates is one of the most common ways scaffolders lose money on variations.
Prelims, risk and margin
Prelims are the costs that never show up in the metreage: transport, supervision, welfare, design fees, inspections. Risk is the access, the programme pressure, and who adapts the scaffold and how often. Margin is a real number added on top, not whatever happens to be left after you have under-priced everything else.
The contract is part of the estimate
Your price is only safe if the contract protects it. Retention, payment terms, and what happens when the job changes all sit on top of the number you quote. A good estimate priced under a bad contract still loses. The estimate and the contract are two halves of the same decision.
Before you send the quote
- Have you scoped the whole scaffold, including the awkward bits that change the price?
- Are variations priced on dayworks, not locked into measured rates?
- Is there a real margin, and does the contract you are pricing under actually protect it?
Anyone can price a scaffold. Pricing it so it still pays at the end is the skill.
Sources
- Technical and good-practice guidance for scaffolding. National Access & Scaffolding Confederation. nasc.org.uk
- Statutory payment rights under the Housing Grants, Construction and Regeneration Act 1996. legislation.gov.uk
Pricing is a module. Running the job is the course.
ScaffSkills covers estimating, contracts, CDM and payment rights across eight CPD modules. Modules 1 and 2 are free.