We build the structure. We finish the story.

Most renovation budgets in Nairobi don't fail because the number was too small. They fail because the number only ever covered one part of the job — usually the visible part, like tiles and paint — while the expensive, invisible part got guessed at or ignored entirely.

Split the budget into two, not one

Treat "structure" and "interior" as two separate budgets that happen to share a schedule. Structural work — foundations, walls, roofing, plumbing and electrical re-routing, waterproofing — is priced by the square metre and driven by the condition of what's already there. Interior work — flooring, cabinetry, fittings, lighting, paint — is priced by finish level, and this is where costs swing the most. A kitchen can be finished in laminate or in imported stone for the same footprint at very different totals, and both are legitimate choices depending on the brief.

Get a real Bill of Quantities before you commit

A one-page estimate is not a budget. Ask any contractor you're considering for a proper Bill of Quantities (BOQ) that breaks the project into line items — materials, labour, and a rate for each. This is the single biggest thing that separates a predictable build from one that doubles in cost halfway through. If a contractor won't give you a BOQ before asking for a deposit, treat that as a warning sign, not a shortcut.

Budget for what you can't see yet

Older Nairobi homes in particular tend to hide surprises behind walls and under floors — outdated wiring, corroded plumbing, or foundations that need reinforcement once opened up. A contingency of 10–15% on top of the BOQ total is standard practice, not a padded number. Projects that skip this line are usually the ones that stall for weeks waiting on an unplanned change order.

Tie payments to milestones, not dates

A sound payment schedule follows physical progress — foundation complete, structure to roof level, first fix (plumbing/electrical), second fix and finishes, handover — rather than the calendar. This protects both sides: you're not paying for work that hasn't happened, and the contractor isn't financing your project out of pocket.

Don't forget permit and professional fees

County approvals, NCA registration checks, and structural engineer sign-off for anything load-bearing are real costs that belong in the budget from day one, not added as a surprise once drawings are ready. For most residential renovations in Nairobi County, budgeting 3–6% of construction cost for permits, approvals, and professional fees is a reasonable starting point — your contractor should be able to confirm current rates for your specific project.

Every renovation conversation eventually runs into the same question: does this need an engineer, or just a good finishing crew? Getting the answer wrong in either direction either wastes money on unnecessary approvals, or — far more seriously — puts a structural change into a home without the checks it needed.

Cosmetic renovation: changing how a space looks

Cosmetic work changes finishes without touching the building's structure: repainting, re-tiling, replacing kitchen or bathroom fittings, new flooring, updated lighting, built-in cabinetry that doesn't bear load. This category generally doesn't require county approval or an engineer, though electrical and plumbing work should still be handled by a qualified tradesperson.

Structural renovation: changing what holds the building up

Structural work changes the building's load path: removing or altering a load-bearing wall, adding a second storey, extending the footprint, altering the roof structure, or working near foundations. This category requires a structural engineer's assessment, drawings, and — in almost every case — county approval before work starts. Skipping this step isn't just a compliance risk; it's a genuine safety risk to everyone who uses the building afterward.

Why soil and site conditions matter here

Parts of Nairobi and the wider region sit on expansive or black cotton soils that shift with moisture, which makes foundation work and any load-bearing alteration more sensitive to get wrong than in many other markets. A proper site and soil assessment before structural work isn't a formality — it's the difference between a wall that lasts decades and one that cracks within a season.

How to tell which one you're planning

• Are you removing, moving, or cutting into any wall that carries weight from above? → Structural.
• Are you adding floor area, a room, or a storey? → Structural.
• Are you changing only surfaces — paint, tiles, fittings, cabinetry — without touching walls or the roof line? → Cosmetic.
• Not sure? Get a site visit before you get a quote. A five-minute assessment is far cheaper than an assumption that turns out wrong.

Most renovations are actually a mix of both, which is exactly why we scope every project with a structural assessment first — it sets the real budget and timeline before any finish decisions are made.

The construction sector has no shortage of people willing to take a deposit and start digging. It has a much smaller pool of contractors who can actually finish what they start, on the budget they quoted. These five questions separate the two, and any contractor worth hiring should answer all of them without hesitating.

1. Are you registered with the National Construction Authority, and at what class?

Kenya's NCA classifies contractors by the scale of project they're licensed to handle. Ask for the registration number and verify it — a legitimate contractor will have no problem sharing this, because it's public information.

2. Can I see proof of insurance and liability cover?

Site accidents and property damage happen even on well-run projects. Insurance protects you as the client from being financially exposed if something goes wrong on your property during construction.

3. Will I get a full Bill of Quantities, not just a total price?

A single lump-sum number with no breakdown makes it impossible to know what you're actually paying for, or to compare quotes fairly between contractors. A proper BOQ, with material and labour rates itemized, is standard practice for any serious contractor.

4. Who is on-site day to day, and how is subcontractor work supervised?

Find out whether the person who sold you the project is the person managing it, and how often specialist subcontractors (electrical, plumbing, structural) are inspected before their work gets closed up behind walls and floors.

5. What happens after handover if something fails?

Ask specifically about the workmanship warranty period and what it covers. A contractor confident in their work will offer this without being asked twice — and will put it in writing.

If a contractor can answer all five clearly and in writing, you're talking to a professional operation. If any answer is vague, that vagueness tends to show up again later — usually at the worst possible point in the project.