Plot and oversite scanning: checked before the next trade starts

Three things: the slab's flatness and level consistency across its surface, the brickwork and blockwork dimensions against the house-type drawing (lengths, widths, diagonals and openings at DPC), and the position of each drain collar against the drainage layout. Each gets its own pass or fail.

No. Plot position on the site grid and finished floor level to site datum stay with your setting-out engineer. We check the plot against its own drawing and against itself, which is where most oversite defects actually come from.

At oversite, once the slab or beam-and-block floor is down and the brickwork is up to DPC, and before the frame, kit or first lift goes on. At that stage everything is visible and still easy to correct.

No. We set up around the gang, scan while work carries on nearby, and are away before the next trade needs the plot. On a typical visit we scan a run of plots in one go.

The report shows exactly what failed and by how much: a collar 60 mm out of position, a wall 15 mm short, a high area on the slab with its extent. Your team can fix it while it is still easy, and we can rescan to close it out.

Groundworks contractors who want evidence their oversites are right before handing over to the builder, and housebuilders who want consistent, independent oversite checks across a site.

No. Neither NHBC nor building control requires a laser scan. Warranty and building control inspectors visit at key stages, but they do not measure every wall, collar and square metre of slab. A plot scan is a quality-control check the groundworker or housebuilder chooses to do, and a dated record of the oversite as handed over. It supports those inspections; it does not replace them or sign anything off.

The house-type drawings for each plot being scanned, the drainage layout showing soil, waste and rainwater collar positions, and the plot numbers. PDF or DWG is fine. Tell us the tolerances you work to for slab flatness, wall dimensions and collar positions, and the site's induction and access rules. Because the checks are against the plot's own drawings, we don't need site datum.

Whatever your specification, housebuilder standard or floor finish needs. Tell us the figure and the report flags any area outside it, with its size and depth. For reference, screed specifications often use the BS 8204 surface regularity classes (SR1, SR2 and SR3, allowing 3, 5 and 10 mm under a 2 m straightedge). The heat-map shows whether the screed or finish will take up a high or low area.

As clear as practical. The scanner measures only what it can see, so pallets of blocks, stacked materials or standing water on the slab hide the surface and any collars beneath them. Brickwork at DPC needs to be visible on both faces for wall dimensions. A plot that is mostly clear still scans fine; we note anything we couldn't see on the report rather than guess.

Yes. Send the plot point clouds, with the house-type and drainage drawings and your tolerances, and we produce the same one-page pass/fail report per plot covering slab flatness, brickwork dimensions and drain collar positions. We check the scan registration first and tell you if a plot's data can't support the check.