What do quantity takeoffs miss on Qardho builds?

A quantity takeoffs supervision gap in Qardho shows up as work that nobody priced and nobody measured until it appears on site. The bid looks complete because the missing items sit outside the drawing: excavation, laps, curing water and temporary works. Weak supervision means the omission stays invisible until the client pays for it twice.

Where do quantity takeoffs go wrong on a Qardho build?

The gap starts when the person measuring works from the finished drawing set alone. Drawings show concrete, blockwork and finishes. They do not show the trench depth the excavator actually reaches, the laps the bar bender adds at every junction, or the water needed to cure slab and blockwork through hot, dry spells. Established practice is to measure those items from the specification and the site, not the drawing.

A second gap opens when the takeoff copies a previous project. Rates, waste allowances and wastage on block and tile carry over unexamined. Ground conditions in Qardho can differ from plot to plot, so ask the municipal engineer's office whether it holds borehole logs or earlier excavation records for the area, and treat any answer as something to verify, not assume.

A third gap is supervision itself. If nobody records what was actually built against the priced quantity, the missing item is discovered late, when the client has least room to negotiate.

How does weak supervision hide the missing quantities?

Supervision decides what gets measured and when. When measurement happens only at handover, shortfalls in rebar cover, concrete volume or block count surface as disputes instead of instructions. Daily checks close the loop: the supervisor measures what was placed, compares it with the takeoff line, and records the difference while the work is still open.

Ask for the site diary, the request for inspection records and the material delivery notes. Those three tell you whether anyone was counting. Walk a recent site in Qardho and ask how footing depth, backfill volume and curing water were measured, and by whom.

Where the contract allows, variations need a written instruction before the work proceeds. Check what your contract says about measurement, notice periods and who signs off extra work. A supervisor who cannot show a measurement trail leaves the client carrying the risk.

How do you check a takeoff before you sign?

Take the priced takeoff and the drawings to the same table. Work section by section and mark every line you cannot match to a drawing or a specification clause. Common omissions are excavation and disposal, backfill, blinding, rebar laps and spacers, formwork, curing water, temporary fencing, and site clearance.

Then test the rates. Ask two suppliers for written quotes on the main materials and compare them with the rates in the takeoff without assuming either is right. Confirm with the designer or engineer how laps, cover and waste are meant to be allowed for, since these are general practice points that the project specification overrides.

Finally, agree the reporting route. Ask the supervisor how a missing quantity is raised, who measures it, and how it reaches the client before the work is covered. Put the answer in the contract file.

What to do next

Ask the contractor for the priced takeoff in spreadsheet form, line by line, plus the drawing revision it was measured from. Set a meeting to walk both documents together before any work starts, and list every item you cannot match. Keep that list as a written schedule of what the bid excludes, and confirm it in the contract before mobilisation.