SubTrada vs Constructionline

Quick answer: Constructionline is a pre-qualification and compliance database — it verifies that a subcontractor meets accreditation, insurance and Building Safety Act requirements before you invite them to tender. SubTrada does that too, but adds live tendering, AI-assisted drawing take-off and scope allocation, document hosting with AI-flagged coordination checks, and a subcontractor marketplace, all in one connected platform. If you need a subcontractor to prove they're compliant, Constructionline is a well-established option. If you need to run the actual procurement of a project — from drawing to tender to award to site — SubTrada covers the parts Constructionline was never built to do.

What Constructionline Actually Does

Constructionline is the UK's best-known construction pre-qualification questionnaire (PQQ) database. Its core function is verification: a subcontractor completes a PAS 91 or Common Assessment Standard PQQ once, and any main contractor using Constructionline can check that subcontractor's accreditations, insurance, financial standing and health and safety compliance without asking them to fill in a separate form for every project. Since Constructionline's parent group (Once For All) acquired BidWork, it also offers a tender management add-on for issuing and tracking tenders to accredited suppliers.

This is genuinely useful, and it solves a real problem: without a shared standard, every main contractor asks every subcontractor the same compliance questions in a slightly different format, wasting everyone's time.

Where It Stops

Constructionline answers one question well: is this subcontractor compliant? It doesn't touch what happens next — reading a project's actual drawings, working out which trade owns which construction detail, building a tender pack that reflects the real scope of the job, or giving a site team a way to check a detail against the drawing once the project is underway. Its tender management module can send and track a tender, but it isn't reading the drawings behind that tender to check the scope is actually complete before it goes out.

Where SubTrada Differs

SubTrada's directory — tiered verification, accreditations and safety statistics, visible before a tender invitation is ever sent.

Both platforms handle subcontractor compliance verification well. Constructionline checks accreditation through its PQQ, PAS 91 and Common Assessment Standard process, and SubTrada does the same through its own Tier 1–4 verification, RIDDOR and safety statistics, with live compliance expiry tracking that flags overdue insurance or accreditation by exact day-count rather than leaving it to a periodic manual check. Both also handle tender dispatch and tracking — Constructionline through its Tender Management add-on, and SubTrada through a full dispatch audit trail showing who sent what, to whom, and whether it's actually been opened.

Where the two part ways is everything upstream and downstream of that tender. Constructionline has no AI drawing take-off or scope allocation function, and no way to flag that two trades have each priced a construction detail against the other, or that neither has priced it at all — SubTrada schedules every constructional detail from a project's live drawings and surfaces exactly that kind of conflict before a tender pack ever goes to market. Constructionline's tender comparison isn't the primary focus of the platform, whereas SubTrada lays every subcontractor's pricing out line by line against the master scope of works so a commercial manager can compare like-for-like in minutes.

Document hosting and drawing revision control is another area where Constructionline offers nothing — it isn't built to store, version or approve drawings. SubTrada handles this with configurable multi-party approval workflows, AI-generated change summaries between drawing revisions, and AI coordination checks that catch gaps like a missing door schedule entry or an unlabelled partition before a drawing is approved. SubTrada also extends the same underlying AI tagging on to site: click any element on a general arrangement plan and see its tagged detail, wall type, or finish schedule instantly, something Constructionline has no equivalent for at all.

Finally, on subcontractor discovery for new work, Constructionline functions primarily as a compliance directory, whereas SubTrada actively surfaces subcontractors to new clients based on demonstrated experience on comparable past packages, not marketing budget or website polish.

The Honest Trade-Off

SubTrada is logged automatically — date, recipient, revision, and whether it's actually been opened.

Constructionline has scale and industry recognition that a younger platform can't claim overnight — if your main reason for using a tool is a widely recognised compliance badge, that's a real point in its favour. SubTrada's compliance tracking is built into a live project rather than being a standalone accreditation, which is an advantage if you want compliance tied to the actual work being tendered, but is a different model to a portable, project-independent certification.

Frequently Asked Questions

Is SubTrada a replacement for Constructionline? For subcontractor compliance verification specifically, Constructionline remains a widely used industry standard. SubTrada replaces the need for separate tendering, take-off, document hosting and compliance-tracking tools by handling all of them against the same live project data — including its own compliance tier verification — rather than replacing a portable accreditation database.

Can I use SubTrada and Constructionline together? Yes. Many main contractors use Constructionline (or an equivalent) for initial compliance screening and then run the actual tender, scope allocation and document control for the project through SubTrada.

Does SubTrada check Building Safety Act compliance? SubTrada's Compliance Tracker monitors accreditation and insurance expiry continuously across every subcontractor engaged on a project, surfacing overdue items with a live day-count so risk is visible before it becomes a contractual issue.

SubTrada is a UK construction procurement platform connecting subcontractors and main contractors. Get in touch to see how it works on a live project.