Ask three contractors what a building costs per square metre and you will get three numbers, all of them useless. Here is what actually moves the price - and how to read a quotation properly.
The first question almost every client asks is what a building costs per square metre. It is a reasonable question and it has no useful answer, which is an awkward way to start a conversation.
The reason is not evasion. It is that the square-metre rate is an output of a design and a site, not an input. Two buildings of identical floor area on plots a kilometre apart can differ in cost by a wide margin, and every one of the reasons is knowable in advance — but only by looking.
This article sets out what genuinely moves a construction budget in Kenya, so that when you receive a quotation you can read it rather than merely compare totals.
1. What the building is for
Use drives specification, and specification drives almost everything else. A warehouse is a roof, a slab and an envelope. A laboratory is a services problem wearing a building. A school has to survive several hundred children a day and satisfy safeguarding and safety requirements a private house does not.
Before anything else is priced, the intended use determines the structural loading, the services provision, the finishes, and the statutory approvals that apply.
2. The ground
Ground conditions are the largest single source of unwelcome surprises in construction, and the least visible before work starts.
Black cotton soil — common across much of Kenya — expands when wet and shrinks when dry. Building on it without addressing it produces cracking that no amount of good workmanship above ground will prevent. Addressing it costs money: excavation and replacement, deeper foundations, or a ground beam and pile arrangement.
Rock is the opposite problem: excellent bearing, expensive to excavate for foundations, drainage and services.
A high water table, made ground, or a former quarry each carry their own solution and their own price. This is why a site visit is not a formality.
3. Access and location
Everything in a building arrives on a lorry. Anything that makes that harder shows up in the price:
- A site a lorry cannot reach means double handling — material offloaded once and moved again by hand or by smaller vehicle.
- A tight urban plot with no space to store material means more frequent deliveries and a smaller working area.
- Distance from the supply of cement, steel, aggregate and stone adds transport to every single item.
- Sites in central Nairobi may face restricted delivery hours and neighbour constraints that lengthen the programme.
4. Substructure versus superstructure
Clients think about the building they will see. A significant part of the budget is spent below the floor slab, where nothing will ever be visible.
Excavation, foundations, ground beams, hardcore, blinding, damp-proofing and the slab all happen before a single wall goes up. On a difficult site, the substructure can consume a share of the budget that feels disproportionate right up until the moment it prevents the building from cracking.
5. Specification and finishes
This is the part clients have most control over, and the range is enormous.
Structure and envelope have a relatively narrow cost band for a given building type. Finishes do not. Floor coverings, sanitaryware, ironmongery, joinery, glazing and external works can vary by a multiple, not a percentage — and they are also the elements most likely to change mid-project, which is where budgets are actually lost.
The practical advice: settle the finishes schedule before work starts. A specification decided during construction is a variation, and variations are priced without competitive pressure.
6. Services
Water, drainage, power and data are not extras. On a serviced urban plot they are a connection. On an unserviced one they are an infrastructure project: a borehole, a septic system or treatment plant, a transformer, a generator, and the trenching to connect them.
Solar generation, water storage and rainwater harvesting sit here too. Each has a capital cost that buys down a running cost — a decision worth making deliberately at design stage rather than discovering later.
7. Programme
Time is money in both directions.
A compressed programme costs more: more labour on site at once, overtime, and premium delivery. A drawn-out programme also costs more: extended preliminaries, prolonged supervision, and material price movement over a longer period.
For a developer, the programme is the investment case — every month a building is not occupied is finance cost against no rental income. For a private client, an overrun is usually rent paid twice.
8. Statutory approvals and compliance
Approvals take time, and time is in the programme. Depending on the project this can include county approvals, environmental impact assessment through NEMA, and consents relating to water and effluent.
Doing this properly costs money. Doing it improperly costs considerably more, because the remedy arrives after the building does.
How to read a quotation
A comparable quotation has three properties. If any is missing, you are not comparing like with like.
A defined scope. What is included, and — just as importantly — what is excluded. Excluded items do not disappear; they arrive later as variations.
A breakdown. Substructure, superstructure, finishes, services, external works and preliminaries as separate figures. A single total tells you nothing about where your money is going or where you could sensibly economise.
Stated assumptions. Ground conditions assumed, access assumed, prime cost sums for items not yet chosen, and provisional sums for work not yet defined. These are the honest way of pricing genuine unknowns.
The lowest number is not the cheapest building
A quotation materially below the others is not a bargain; it is a message. Usually it means one of three things: something has been left out of the scope, the specification assumed is lower, or the price is a way of getting on site before the real number appears as variations.
Ask what a low quote excludes. The answer is more useful than the number.
What Primebuild does
Primebuild Construction Limited prices each proposal against a defined scope, so what is included and what is excluded is legible before anyone commits. The process starts with a site appraisal: understanding the intended use, and establishing the real constraints of access, services, ground conditions, neighbours and programme — the eight factors above, on your site specifically.
The firm's stated company policy is to give clients the very best value for their money through its technical personnel, and to apply the same standards of practice to every project, however big or small.
To discuss a project, call +254 705 555 760 or request a quote.