You've bought the plot, drawn the plans, and found a builder with a great price. Then, weeks into construction, an inspector arrives, asks for paperwork your contractor can't produce, and slaps a stop-order on your site. Work freezes, the workers still need paying, and your "cheap" builder has just become very expensive. The single thing that prevents this? Proof your contractor is registered with the National Construction Authority. Here's why it's not optional — and how to protect yourself.
What is the NCA?
The National Construction Authority (NCA) is Kenya's construction-industry regulator, established under the National Construction Authority Act of 2011. Its job is to register and oversee everyone who builds in Kenya — contractors, skilled workers, and site supervisors — and to keep the industry safe. The Authority credits its work with cutting building-collapse incidents significantly and weeding out the rogue operators behind so many failed and abandoned projects.
It's the law — not a formality
Here's the part many homeowners miss: under the Act, it is a criminal offence to operate as a contractor without NCA registration — and you, the project owner, are not off the hook. Hiring an unregistered contractor exposes you to legal action, and every construction project, residential or commercial, must be registered with the NCA before work begins. A contractor whose licence has lapsed is, in the eyes of the law, not a contractor at all.
The contractor categories (NCA 1–8)
NCA registers contractors in eight categories: NCA 1, the highest, for unlimited-value mega projects, down to NCA 8, the entry level. The category caps the maximum project value a contractor may take on, across classes of work such as buildings, roads, water, and electrical/mechanical. The reassuring news for homeowners: even entry-level NCA 8 covers building works up to around KSh 10 million — which covers most family homes — so any serious home contractor should already be registered. For you, three things matter:
- Your contractor is registered in the buildings class.
- At a level that comfortably covers your project's value.
- And holds a current practising licence.
Two registrations, not one
A crucial distinction trips up many builds: contractor registration and project registration are separate. Your contractor must hold valid NCA registration and a current-year practising licence — and on top of that, your specific project must be registered with the NCA before work starts. Project registration also requires that your consultants (architect, engineer, quantity surveyor) are registered with their own boards (BORAQS, EBK) and that other approvals, such as your county and NEMA, are in order. Only then is an NCA compliance certificate issued for the site.
Why it matters to you — the real risks
Skipping this isn't a paperwork shortcut — it's a financial gamble:
- Stop-orders. Inspectors can halt your site on the spot for an unregistered contractor or a missing compliance certificate, freezing everything while costs keep running.
- Voided insurance. If an accident happens under an unregistered or lapsed licence, your insurer can refuse the claim — leaving you to cover injuries or damage yourself.
- Safety and collapse. Unlicensed contractors are repeatedly linked to the building collapses that make headlines. Registration is the industry's first filter for competence.
- Delays and penalties. Regularising compliance after work has started is far slower and more expensive than getting it right first — and in extreme cases, illegal structures are demolished.
How to check your contractor (in minutes)
You don't have to take a builder's word for it. The NCA publishes its register publicly. Ask your contractor for their NCA registration number, then go to the NCA website, open the "Check Contractor" tool, and enter the number to confirm they're registered — and, just as importantly, that their practising licence is current for this financial year. A worrying share of registered contractors let their annual licence lapse, so "registered once" is not the same as "licensed now."
A note on small builds
There's a practical concession for smaller projects: works valued at around KSh 5 million and below may be carried out under an NCA-accredited site supervisor rather than a full contractor, provided they meet the Authority's requirements. If you're building modestly, ask whether your team qualifies under this route — but the registration principle still applies.
Your pre-build compliance checklist
Before you release any money or break ground, confirm:
- Your contractor's NCA registration and current practising licence (verified on the NCA portal).
- The right category for your project's value and type (buildings class).
- That your project itself is registered with the NCA.
- Your consultants are registered with BORAQS/EBK, and county and NEMA approvals are in hand.
The bottom line
A registered contractor costs no more than an unregistered one — but only one of them can keep your site running, your insurance valid, and your home standing safely. In Kenya in 2026, checking your builder's NCA status is the cheapest insurance you'll ever buy. Spend the five minutes before you spend the millions.
This article is general guidance, not legal advice. Requirements and fees can change; always confirm the current rules with the NCA and your county before starting your project.
