Why Ground Floor Units Have More Problems

Ground and podium-level apartments are usually cheaper per square metre, and the discount is normally explained in terms of noise, privacy and view. There is another reason, and it is structural.

The ground floor is where a building meets soil, drainage, landscaping, waste and the street. Every one of those is a pest pathway, and the upper floors are insulated from all of them.

Soil contact

Subterranean termites enter buildings from soil, so a ground-floor unit is exposed in a way that an eleventh-floor unit is not. Ants nest in soil and forage into the nearest structure. Millipedes, centipedes and occasionally snakes appear at ground-level thresholds after heavy rain.

None of these are available to a high-floor apartment, which is why a ground-floor programme looks quite different from an upper-floor one and usually includes a perimeter component.

Drainage, at the point where it is loaded

The drainage from the whole vertical stack arrives at the bottom, so the ground-floor connection carries the flow from every apartment above. Where a system surges after heavy rain, the ground floor is where water seals are blown and where backflow occurs.

That is why large cockroaches appear in ground-floor bathrooms more often, and why a ground-floor unit benefits disproportionately from one-way drain inserts.

Landscaping

Podium gardens, planting beds against walls, mulch, irrigation and ornamental water features all sit at this level. Irrigation keeps soil permanently moist next to a building, mulch above a damp-proof course is a termite bridge, and dense planting against a wall is cover for rodents.

A clear strip of 30 to 50 cm between planting and the building wall is one of the cheapest and most effective interventions available at this level, and it is almost never specified by a landscape designer.

The waste and service side

Bin stores, loading areas, delivery doors and plant rooms are all at or near ground level. A ground-floor apartment near a refuse room is exposed to the largest concentrated food source in the building, and one near a loading bay is next to the largest permanent opening.

When choosing a ground-floor unit, its position relative to those two features matters more than almost anything else about the apartment.

The street

Ground-floor units share the perimeter with the pavement, the street drainage and whatever operates at street level. In a mixed-use building with food businesses on the ground floor, a residential unit on the same level shares walls, drains and often a service corridor with them.

What offsets it

Ground-floor units are much easier to survey, treat and proof, because everything is reachable. A perimeter treatment is possible, external monitoring works, and the entry points are visible rather than hidden three floors up in a shaft.

They also usually have a private terrace or garden, which means containers and drainage that you control directly rather than through a management office. In practice a well-managed ground-floor unit performs better than a poorly managed unit on floor fifteen.

There is a fifth factor that gets overlooked, and it is human. Ground-floor units have doors that open directly outside, terraces that get used, and deliveries left at the door, so they are opened far more often than an apartment reached through a lift and a corridor. Every one of those openings is brief and there are a great many of them, and in a warm city that adds up to a materially different exposure.

What to do if you live in one

Seal the threshold and fit brush strips to external doors. Fit one-way inserts to floor drains. Keep a clear strip between planting and the wall, and move any mulch or soil piled above the damp-proof course. Check the tray under the outdoor air-conditioning unit, which at this level is often in a shrub bed and permanently wet.

And have a termite inspection, because ground contact makes that a real risk rather than a theoretical one — this is the single item on the list that is worth spending money on rather than an afternoon.

Related reading

See basement car parks and refuse rooms and chutes. For soil-related risk, subterranean termites and gardens and planting. Flooding is covered in what happens during a flood. Our parent company runs the Vietnamese-language residential programme.

Global Pest Control is the English-language arm of Khử Trùng Toàn Cầu, based in Thu Duc City.

Common questions

Should I avoid ground-floor apartments entirely?

No — the differences are manageable and the position within the floor matters more than the floor itself. What is worth avoiding is a ground-floor unit adjacent to a bin store, a loading bay or a food business, and a unit with dense planting pressed against its external wall. Those three are worth more attention than the floor number.

Is the second floor much better?

Substantially, for everything soil-related and for most drainage backflow. It is not different for anything travelling through risers and ceiling voids, which is why upper floors still report rodents and ants. The biggest single step change is between ground and first floor.

Our podium garden is watered twice a day. Is that a problem?

It can be, if the irrigation keeps soil against the building permanently wet or if the drainage under the beds does not clear. That combination supports ants, provides termite conditions and keeps a moisture source at the wall line. Raising it with management as an irrigation scheduling question is usually more productive than raising it as a pest complaint.