Why Nigerian Buildings Leak Every Rainy Season — and What to Do About It

Every Nigerian rainy season, the same buildings leak. Apartments in Lekki. Hotels in Port Harcourt. Government blocks in Abuja built in the early 2010s. The owners blame the rain. The contractors blame the builders. The builders are long gone.

The truth is more boring. Most Nigerian buildings leak because of two or three decisions made years before the first drop of rain — a thin DPC, the wrong screed slope on a flat roof, untreated cold joints between a basement wall and its raft. None of these are visible after the building is plastered. All of them are catastrophic by year five.

At Serotny we have spent twenty years on the back end of those decisions. This piece is what we look for when we walk a site for the first time, what those defects actually cost to remedy, and why "more bitumen" is almost never the answer.

Where Nigerian buildings actually leak

The romantic image of a leak is a roof. In our records, roofs account for a little under a third of the structural water problems we are called out to. The rest are split between basements, balconies, swimming pools, and — most underestimated of all — the cold joints between concrete elements poured at different times.

What we look for on inspection

Our inspection team works from a fixed checklist. We do not quote without it. The checklist forces us to look at the things that are easy to miss in a five-minute walk: the falls on the roof terrace, the kicker joints at the basement, the perimeter detail where the balcony meets the cladding.

What the fix actually looks like

When the diagnosis is right, the fix is almost always cheaper than the owner expected — and almost always more invasive than they hoped. We will write a longer piece on each of the common defects in subsequent posts. If you have a leak that recurs every rainy season, send us a WhatsApp message with photos and we will tell you what is most likely causing it.