How to Choose a Building Contractor in Kenya

Step 1: Know What Type of Contractor You Need

Not all contractors are the same. Understanding the types helps you hire the right one:

• Full building contractor: Manages the entire project from foundation to finishing. Best if you don't want to manage individual fundis yourself.
• Phase-based contractor: You hire different specialists for each phase (foundation guy, walling guy, roofer, etc.). More work to manage but can be cheaper.
• Fundi (artisan): Individual skilled workers you hire directly. Cheapest option but requires you to supervise closely and source materials yourself.
• NCA-registered contractor: Officially registered with the National Construction Authority. Required for commercial projects and recommended for any significant build.

Step 2: Find Potential Contractors

• Use JengaHub: Browse verified contractors in Nairobi with ratings, phone numbers, and reviews.
• Ask for referrals: Talk to friends, family, or neighbours who have built recently. Visit their houses to see the quality of work.
• Check NCA database: The National Construction Authority maintains a list of registered contractors by category (NCA 1 through NCA 8).
• Visit ongoing projects: If you see a construction site with good workmanship in your area, ask who the contractor is.

Step 3: Vet Your Shortlist

Once you have 3–5 potential contractors, verify each one:

Step 4: Compare Quotes Carefully

Get written quotes from at least 3 contractors. When comparing:

• Don't just pick the cheapest: Unusually low quotes often mean cutting corners, using substandard materials, or surprise costs later.
• Ensure quotes are detailed: Each phase should have itemized costs. Vague "lump sum" quotes are a red flag.
• Clarify what's included: Does the quote include materials, transport, labour, and supervision? Or just labour?
• Ask about payment schedule: Never pay 100% upfront. A typical schedule is 30% to start, then payments at each phase milestone.
• Check the timeline: A 3-bedroom bungalow typically takes 4–6 months. If someone promises 2 months, be skeptical.

Step 5: Sign a Written Contract

This is non-negotiable. A written contract protects both you and the contractor. It should include:

• Full scope of work (what exactly they will do)
• Total cost and payment schedule tied to milestones
• Timeline with expected completion dates per phase
• Materials specifications (cement brand, steel gauge, etc.)
• Warranty period for defects (minimum 6 months)
• Penalty clauses for delays
• Dispute resolution process

Red Flags to Watch For

• Demands full payment upfront
• No written contract or refuses to sign one
• Cannot provide references or past projects
• Significantly cheaper than all other quotes
• No physical office or permanent phone number
• Pressures you to decide immediately
• Won't work with your architect or quantity surveyor
• History of incomplete projects (ask around)

During Construction: Stay Involved

• Visit the site regularly: At least 2–3 times per week, or hire a site supervisor.
• Take photos: Document progress at every stage. This is useful for disputes and insurance.
• Pay per milestone: Only release payment when each phase is completed to your satisfaction.
• Involve your architect: They should inspect work at key stages (foundation, walling, roofing).
• Keep receipts: Track every material purchase and payment. A simple notebook or spreadsheet works.

Related Guides

• Cost to Build a 3-Bedroom House in Kenya (2026 Guide)
• Cement Prices in Nairobi — Brand Comparison & Where to Buy