What cleaning mistakes make a building handover fail?

This is the most frequent mistake, and the most expensive one, because it gets paid for twice.

A painter coming back for a touch-up, a plumber opening an access hatch, a tiler redoing a joint: each one resoils what has just been handed over, with sanding dust settling back across the whole room and fresh silicone that is not yet cured.

The real cost: a full second pass — the price of the job all over again — when a three-day delay would have avoided it.

The rule: the cleaning team goes in last, once every trade has finished, rubble has gone, and water and electricity are on.

This is the entry condition a developer needs to write into the tender brief — the point is set out in full in our guide to what a developer should require at handover. It is our condition too: we come in once every tradesperson has finished and the rubble has gone.

Grout is hard to the touch within 24 to 48 hours. Yet it has not finished drying and carbonating for around 7 days, and up to three weeks on a wide joint in a poorly ventilated room.

Cleaning in between causes three problems at once: water hollows out the joint, which turns powdery; the product discolours the binder unevenly; and the released cement brings back the haze across the whole floor.

The real cost: partial regrouting, which is the tiler's job, plus a second clean.

The rule: seven days minimum between grouting and cleaning the floors. The full mechanism is explained in cement haze and its seven-day rule.

Dry tile and dry grout absorb the solution. The acid then penetrates the porosity instead of staying on the surface, attacks the joint from within, and leaves pale rings that cannot be undone.

Two variants of the same mistake are just as common: using hardware-store hydrochloric acid instead of a buffered acid formulated for floors — its fumes oxidise the taps and hinges throughout the room — and letting the solution dry, which redeposits the dissolved matter, harder than before.

The real cost: on marble or limestone, a permanent matte ring that can only be corrected by full diamond-pad honing.

The rule: soak generously with clean water and let it saturate for two to three minutes before any application, and never use acid, at any dilution, on marble, travertine, limestone or zellige (Moroccan glazed terracotta tile).

Water on plaster dust does not make a clean floor: it makes sludge that clings to the surface, fills the joints, and then takes twice as long to remove. On cement dust, it sets solid.

The twin mistake is sweeping: it puts most of what it moves back into suspension, and the dust settles again on surfaces already treated within the hour that follows.

The real cost: half a team-day extra, plus joints that have to be rebrushed one by one.

The rule: all dry matter is captured with a fine-filtration vacuum, from ceiling to skirting, before the first drop of water. The material reasons for this are covered in our article on why a domestic vacuum is not enough on a building site.

Glazing is the last job of the day in almost every schedule. In Marrakech, that is also when south-facing glass is at its hottest.

Above roughly 25°C on the glass surface, the washing solution dries before it can be squeegeed off. It leaves streaks and a haze that the second pass does not remove, because the residue has already set.

Two further mistakes compound it: scraping with a blade on dry glass — the blade should always glide on a soapy film — and scraping coated, self-cleaning or frosted glass, whose functional coating comes away with the blade and does not come back.

The rule: follow the shade. East-facing façades in the morning, west-facing in the late afternoon, and never a window in full sun. The full service is detailed on window cleaning after building work: glass marked with paint, adhesive or cement carries the +40% surcharge there, and some marks may remain depending on the surface.

These are the three points a site manager checks first, precisely because they are the first ones forgotten.

• The window weep channel: the low groove in the frame, full of cutting grit. It is vacuumed dry; wetted first, it turns into mortar.
• The sliding track: brushed dry, vacuumed, then washed. Washed first, the sand becomes an abrasive paste that wears the roller and makes the door stick.
• The drainage holes: the openings at the base of the frame that let rainwater out. Blocked with mortar, they leave water standing in the frame at the first shower — and the defect gets blamed on the joiner.

The real cost: a snag noted on the handover report, with a return visit, over a job that would have taken ten minutes. The full list of checked points is published in our pre-handover inspection checklist.

An overhead light shines straight down, perpendicular to the floor. It flattens the surface and hides exactly the defects that make a handover fail: residual haze, a squeegee mark, a micro-scratch, dried drips on a window frame.

The next morning, the sun comes through the window at an almost grazing angle. What was invisible becomes obvious — and that is the moment the buyer chooses to visit.

The rule: inspect with a lamp held a few centimetres from the surface, the beam almost parallel to the floor, on a dry floor. It is the only angle at which a residual defect shows up. The inspection method and the return-visit policy are described on final touch-up and the closing inspection.

The last mistake is not technical, it is contractual, and it causes half the disputes in the sector.

A quote that does not say what it excludes does not say what it includes. The items missing on handover day are always the same: glazing, terraces and surrounding areas, common parts, rubble clearance, re-polishing of a stone floor, and the second pass after a trade comes back to fix something.

A quote that also fails to qualify the starting condition will be revised on site: a site covered in marks ties the team up for almost twice as long at equal floor area.

Take a 120 m² apartment with standard tiles: 120 × 20 = 2,400 MAD, raised to the 3,000 MAD incl. VAT apartment minimum; with many marks (+20%), 3,600 MAD incl. VAT; with thick residue on almost every surface (+40%), 4,200 MAD incl. VAT. Same floor area, 1,200 MAD apart: the condition is declared up front, with photos.

The rule: get the exclusions written down, get the starting condition assessed, and get it written down what happens if the result is not compliant. The pricing grid and terms are on post-construction cleaning prices, and the full reasoning in what a building site really costs. To have your property assessed before handover, send dated photos and the handover date.