Costs & budgeting
How to budget for building a house in Kenya
Most stalled houses in Kenya didn't stall because the owner ran out of ambition — they stalled because the budget was built on a guess. A good budget is a working tool you use every week, not a single number agreed at the start.
Step 1: Separate the budget into clear parts
| Budget part | What it covers |
|---|---|
| Pre-construction | Survey, designs, structural calculations, BOQ, approvals and statutory requirements |
| Substructure | Excavation, foundations, ground slab, damp-proofing |
| Superstructure | Walling, columns, beams, suspended slabs, staircase |
| Roofing | Roof structure, covering, gutters, fascia |
| Services | Plumbing, drainage, electrical installation |
| Finishes | Plaster, screed, tiles, ceilings, paint, doors, windows, joinery |
| External works | Septic/sewer connection, water storage, paving, fencing, gate |
| Supervision & fees | Professional supervision, project management, testing |
| Contingency | An agreed reserve for genuine unforeseen items |
Step 2: Price from quantities, not from a neighbour's house
Ask a qualified professional to measure your drawings and prepare a Bill of Quantities. Each line — so many cubic metres of concrete, so many tonnes of steel, so many blocks — can then be priced at current local rates. See understanding Bills of Quantities.
Step 3: Plan the cash flow
Construction money leaves your account in waves. Map out roughly when each stage will need funding. If your income arrives monthly or in tranches, plan the project in phases that leave the building safe and weather-protected at the end of each one — for example, reaching roof level before pausing, rather than leaving exposed reinforcement for months.
Step 4: Tie payments to verified progress
Pay for work that is complete and inspected, not for time passed or work promised. Agree milestones in writing and have someone independent confirm them before each payment. This is the core of independent site supervision.
Step 5: Track budget against actual spend
Keep every receipt, M-Pesa statement and delivery note. Once a month, compare actual spending against the budget for each stage. Small overruns are easy to correct early; large ones discovered at roofing stage are not.
Step 6: Control changes
Every change — a bigger window, an extra room, a different tile — has a cost and often a time impact. Agree the price of a change before the work is done, and record it.
Rule of thumb for owners: if you can't say what has been spent, what's left, and what the remaining work will cost, you don't yet have a budget — you have a hope.
This article is general guidance for property owners in Kenya and is not a substitute for professional advice on your specific project. Regulations, requirements and prices change — confirm current details with the relevant authority or professional.