SubTrada vs Asite & 4Projects

Quick answer: Asite and 4Projects are established Common Data Environments (CDEs) — centralised, ISO 19650-compliant repositories for drawings, models and project documents, widely used on major infrastructure and Tier 1 programmes. SubTrada's Document Hosting module does the same core job of version control and multi-party approval, but goes further: it reads the actual construction content of a drawing, using AI to schedule every detail, flag scope-ownership conflicts between trades, and turn the drawing into a clickable reference a site team can navigate detail by detail from an iPad, not just a document they store and download.

What Asite and 4Projects Actually Do

Asite is one of the best-known CDE platforms in UK and international construction, used on programmes including Transport for London and the Thames Tideway Tunnel. Its core strength is exactly what ISO 19650 asks a CDE to be: a secure, central repository for documents, drawings and models, with role-based access, revision control, workflow automation, offline mobile access on site, and 3D BIM viewing across large, multi-party programmes. 4Projects offers a similar proposition — document and drawing management, workflow and process control, and additional modules including tender management and NEC3 contract administration.

Both are mature, well-proven platforms for exactly the problem a CDE is meant to solve: making sure every party on a large, complex project is working from the same current version of every document.

Where They Stop

This is the gap in one screenshot: an AI-generated summary of what changed between drawing revisions, plus two coordination gaps flagged automatically before the reviewer approves — something a traditional CDE simply doesn't do, because it doesn't read the drawing's content.

A CDE's job is to store, version and share documents — it treats a drawing as a file to be approved and downloaded, not as data to be read. Neither Asite nor 4Projects's core CDE functionality identifies the constructional details inside a drawing, works out which trade should own a specific detail, or flags that two trades' take-offs have each assumed the other is pricing the same item. And neither turns the drawing itself into something a site team can click through, detail by detail, from a tablet standing in the room the drawing describes — the drawing remains a document to be opened and read, not a navigable reference.

They are also generally scoped and priced around large, complex, multi-party programmes — a natural fit for major infrastructure clients, but a heavier lift than a £1–10 million mid-market residential or commercial scheme typically needs or can easily justify.

Where SubTrada Differs

A configurable, drag-to-arrange approval chain with parallel sign-off — the same multi-party discipline a CDE provides, built around construction's actual approval hierarchy rather than generic document permissions.

On the fundamentals of a CDE, both sides are equally capable. Asite and 4Projects offer a central document repository with version control, multi-party role-based approval workflows, and an ISO 19650-style single source of truth — and SubTrada matches all three, with its own configurable approval chains that support parallel sign-off from multiple parties at once.

Everything else is where the gap opens up. Neither Asite nor 4Projects offers AI drawing take-off or scope allocation, so neither can schedule every constructional detail across a drawing set or flag a scope-ownership conflict before a tender goes out — SubTrada does both. Neither generates an AI change summary between drawing revisions or runs AI coordination checks that catch a missing door schedule entry or an unlabelled partition before approval; SubTrada does both of those too, automatically, every time a drawing moves to a new revision. Click-to-detail on-site navigation is the same story: there's no equivalent on a traditional CDE, while on SubTrada a site manager can click the kitchen, a wall, the stair or the sanitaryware on a general arrangement plan and see the exact tagged detail instantly.

Native tendering and a subcontractor marketplace exist on Asite and 4Projects only as an add-on or in limited form, whereas SubTrada has both built in and connected to the same take-off and compliance data used everywhere else on the platform. The clearest structural difference is scale: Asite and 4Projects are generally built and priced around large, complex, multi-party programmes, while SubTrada runs projects of any size, from a £1 million refurbishment to a £150 million fit-out, without a different tier of setup or cost for either end of that range.

The On-Site Difference, in Practice

This is the clearest way to see the gap. On a traditional CDE, a site manager checking a wall type in a specific apartment has to leave the room mentally: open the CDE, find the right folder, download the correct drawing revision, locate the tag printed on it, then leave that document entirely to search a separate wall types schedule — which might list ten or more build-ups across the scheme — scroll to the matching entry, and check it applies to this exact location and revision. Repeat for the floor finish, the wall finish, the sanitaryware, the stair detail. On a single apartment, that can mean six, eight, ten separate document searches.

On SubTrada, the same site manager opens the general arrangement plan already loaded on their iPad and taps the kitchen: the kitchen detail appears immediately, tagged to that exact location and revision. They tap the bathroom, the wall, the floor, the stair, the sanitary fittings, and get the same instant result every time — because the tagging engine that built the tender pack in the office is the same one now sitting behind every drawing on site.

The Honest Trade-Off

Asite and 4Projects have a genuine, earned advantage on very large, complex, multi-party infrastructure programmes: mature workflow customisation, established integrations, and a long track record on projects at a scale SubTrada doesn't yet target. If you're running a Tier 1 infrastructure programme with dozens of stakeholders and a dedicated information management team, that maturity matters. SubTrada is built for the much larger population of UK projects that need the same underlying discipline — a single source of truth, explicit scope ownership, an auditable approval trail — without the cost, complexity, or dedicated BIM coordination role that a traditional CDE implementation typically assumes.

Frequently Asked Questions

Is SubTrada a CDE? SubTrada's Document Hosting module performs the core functions of a CDE — centralised storage, version control, role-based multi-party approval — and adds AI that reads the drawing's actual construction content, which traditional CDEs do not do.

Can SubTrada replace Asite or 4Projects on a large infrastructure programme? For very large, complex, multi-party programmes with established CDE workflows already in place, Asite and 4Projects have a maturity and track record SubTrada isn't positioned to replace today. SubTrada is built for the mid-market projects that scale of tooling was never really designed for.

What is click-to-detail navigation and why doesn't a CDE have it? It's SubTrada's ability to tag every constructional detail identified during AI take-off to its exact location on a drawing, so a reviewer or site team member can click a room, a wall, or a fitting on a general arrangement plan and see its tagged detail instantly. Traditional CDEs store and version drawings as documents; they don't read the construction content inside them, so there's nothing for a click to be tagged to.

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