20 trade sections
Schedule of Works
A detailed, descriptive scope with drawing references and source labels.
For UK homeowners
Stop comparing building quotes that aren't quoting for the same thing.
OneSpec turns your drawings and decisions into one clear Schedule of Works, so every builder prices the same scope, and you can finally compare like with like.
One specification. Multiple builders. One intelligent comparison.
The problem
Three quotes. Three different projects.
Most homeowners send drawings to a few builders and get back quotes that vary by tens of thousands of pounds. One includes the kitchen, one doesn't. One allows for steel, another leaves it as "TBC".
Without a shared specification, you can't tell whether the cheapest quote is good value or simply missing work, and those gaps become extras halfway through the build.
Builder A
£68,400
Excludes drainage and decoration
Builder B
£91,250
Includes kitchen fit and steels
Builder C
£74,900
Provisional sums for windows
A £149 tender package could help you avoid thousands in unexpected extras.
Two builders can price the same drawings and arrive at very different figures, not simply because one is cheaper, but because they may have included different work. OneSpec helps you define the scope before tendering and understand the differences when quotations come back.
Potential savings depend on your project and quotations. Financial savings are not guaranteed.
See an example tender comparisonExample tender package
See Exactly What You’ll Receive
One fictional extension. One shared scope. Three builder returns with differences made visible.
Blank builder prices
Contractor Pricing Schedule
The same specification, with blank prices and a tender return summary.
Three fictional builders
Tender Comparison Report
Fictional returns showing price gaps, provisional sums and questions to resolve.
Illustrative examples, not live quotations or a contractor recommendation. No registration required.
How it works
From drawings to a tender-ready specification
Upload your drawings
Plans, elevations, sections and structural details are read and organised into a drawing register.
Answer a guided interview
Plain-English questions capture your choices, and flag anything the drawings don't confirm.
Issue one specification
Export a branded Schedule of Works across 20 trade sections, ready to send to every builder.
Why homeowners use OneSpec
Comparable quotes
Every builder prices the same scope, item by item.
No invented detail
Gaps are flagged as clarifications, never guessed.
Fewer surprise extras
Inclusions, exclusions and provisional sums are explicit.
Builders welcome it
Clear tenders are quicker to price, and free to receive.
Simple, per-project pricing
A fraction of the cost of one overlooked extra.
Specification Only
£69
per project, incl. VAT
A clear, trade-by-trade Schedule of Works you can send to any builder.
- Drawing upload and AI analysis
- Adaptive specification interview
- Editable Schedule of Works (20 trade sections)
- Branded PDF export with drawing register
Most popular
Complete Tender Package
£149
per project, incl. VAT
Everything in Specification Only, prepared for issue to multiple builders.
- Everything in Specification Only
- Tender Readiness review
- Clarification tracking before issue
- Revision history for every reissue
- Structured side-by-side quote comparison
- Builder pricing, quotation uploads and AI feedback
Professional Review
From £299
per project, incl. VAT
A construction professional checks your specification before it goes out.
- Everything in Complete Tender Package
- Human review by an experienced professional
- Written comments on risks and gaps
- Priced to project complexity