Specification method
How to write a construction specification: method, structure and pitfalls
A construction specification describes, package by package, the works to be carried out and their requirements. Written well, it secures the tender and limits disputes. Here is a method to structure it effectively.
What is a construction specification?
The specification is a written document of the works contract. It is part of the tender package and describes, for each package, the nature and technical characteristics of the works: materials, installation, expected performance and applicable standards.
It differs from the administrative clauses, the priced schedule and the drawings: the specification says "what" and "how", the priced schedule says "how much".
The structure of a specification
A specification is generally organized on two levels: general clauses common to the project, then a description package by package.
- General clauses: project overview, site constraints, common requirements, applicable standards.
- Description by package: one chapter per trade (structural work, plumbing, electrical, etc.), with articles describing each item of work.
- Articles: clear label, technical description, location, and where relevant the variants or options.
A step-by-step writing method
Reliable writing follows a logical thread, from scope to detail.
- Define the scope: which packages actually concern the project?
- Start from a template or a library of standardized clauses rather than a blank page.
- Adapt each article to the project: materials, performance, precise location.
- Check consistency with the drawings, the take-off and the priced schedule.
- Have it proofread: an ambiguous specification is paid for in extra work.
Common mistakes to avoid
- Copy-pasting a specification from another project without adapting it: risk of off-topic or contradictory clauses.
- Describing a proprietary product without an "or equivalent" mention: against public procurement rules.
- Forgetting consistency between specification, take-off and priced schedule: mismatched quantities distort the bids.
- Staying vague on performance: prefer measurable requirements and cited standards.
Saving time without losing quality
Writing a specification is time-consuming if you start from scratch every time. A library of clauses by package, ready-made variants and a clean Word export save entire days.
That is exactly what BuildOS offers: you tick the articles that concern your project, adjust them, and the specification is generated, structured and ready to share.