Material-Only vs. Labor-Only vs. Turnkey (Full Contract): Which Saves You More Money?

When a builder compares a labour-only quote with a turnkey proposal, the lowest headline figure can look like an obvious saving. But the quote is only one part of the cost. Someone must still order materials, check deliveries, secure stock, coordinate trades, approve substitutions, manage waste and solve the delays caused when something is missing. If those duties move from the contractor to the owner, the price may move too—but so does the work and the risk.

This guide explains material-only purchasing, labour-only contracting and turnkey building in Kenya, including the hidden tasks that can erase an apparent saving. The practical answer to “which saves more money?” is: whichever arrangement gives you the lowest verified total cost for the same finished scope, with responsibilities and exclusions written down.

First, define what each quote means

There is no single everyday meaning of “material-only” or “labour-only” used by every contractor. One supplier may use “material-only” to mean that it sells and delivers materials but does not install them. A homeowner may use the same words to mean that the owner will buy the materials separately and hire a crew. A labour-only contractor usually provides workmanship for a stated scope, while the owner supplies the materials. Always rely on the signed scope, not the label in an advert or WhatsApp message.

For a fair comparison in this article, client-supplied materials means the homeowner purchases the specified materials directly and separately engages labour. Labour-only means the contractor or foreperson prices for labour and the agreed supervision of defined work, while the client remains responsible for materials unless the contract says otherwise. Turnkey means one main contractor coordinates the agreed work and supplies the included materials through to a stated handover standard. Design, approvals, external works, utilities, furniture and appliances are not automatically included just because a quote says turnkey.

Compare total cost, not just the contractor’s fee

Use the same approved drawings, measured quantities, material specification, workmanship standard, programme and exclusions for every tender. Ask each bidder to price the same work breakdown: preliminaries and site management; substructure; frame and walls; roof; finishes; electrical and plumbing; external works; taxes; provisional sums; and any owner-supplied items. Without that common baseline, a lower labour-only amount may simply omit scaffolding, transport, waste removal, temporary utilities, supervision or finishing work that another bidder included.

A useful comparison is: equivalent project cost = contractor or labour price + materials not included + delivery and offloading + supervision and procurement time + security and storage + waste, damage and replacements + delay/financing cost + rework + excluded professional, approval and external-work costs. Add the value of your own hours. A day spent chasing a short load is still a project cost, even if it does not appear on a contractor invoice.

For an order-of-cost reference—not a tender quotation—the publicly viewable Cadreatech calculator states that it applies IQSK Cost Handbook 2025/2026 Part C rates. Its example for a standard private dwelling in Nairobi uses KSh 45,200 per square metre, VAT-inclusive. At 60 m² gross floor area, that is KSh 2,712,000 base building cost; adding the calculator’s optional 10% contingency gives KSh 2,983,200. The calculator says it is indicative, not a BOQ or tender sum, and excludes items such as land, approvals, financing, furniture and many external works. It does not tell you that labour-only or turnkey will cost a particular percentage more or less. Use a measured, project-specific BOQ and comparable written quotes to find that out. See the calculator’s assumptions.

Labour-only: the saving is conditional

The attraction is straightforward: the owner can compare supplier prices, buy only what the drawings call for and avoid paying a main contractor to handle procurement. A labour-only arrangement can be sensible when a project is simple, quantities are measured, the owner has construction knowledge or a trusted independent supervisor, and materials can be delivered to a secure site on schedule.

The trade-off is that the owner becomes part of the supply chain. You may need to collect quotations, check specifications, make deposits, arrange transport, receive loads, count items, protect stock, release materials to crews and resolve shortages. If the crew reaches a stage with no sand, steel or fittings, labour can stand idle. The programme then slips even if the labour rate looked attractive. Multiple site visits, fuel, mobile money charges, loading and unloading, storage and replacement orders are all real costs.

Labour-only does not inherently cause theft, poor workmanship or delay. Weak controls make those risks more likely. The owner and contractor should agree who keeps keys, who signs delivery notes, who is allowed to remove surplus materials, how daily labour attendance is recorded, which person can approve a substitution, and what happens when work is rejected. Pay against measured milestones and inspection records rather than a vague promise to “finish the house.”

Client-managed materials: avoid being short-changed at delivery

Buying direct can improve visibility, but a low unit price is not a saving if the delivered quantity or grade is wrong. Sand and aggregate are commonly sold by truckload, yet truck body size, heaped load, moisture, contamination and how the load is measured can differ. Before ordering, state the required material and approximate quantity in the purchase order, record the supplier and agreed delivery basis, and check the load before signing. Where practical, confirm the vehicle’s usable dimensions or use a documented weighing or volume method; keep a photo of the truck and delivery ticket. Do not assume that “one lorry” is a standard unit.

Timber also needs a specification. “Good timber” is not enough for a roof or structural use. The designer or engineer should identify the required species or accepted equivalent, dimensions, grading or strength class where relevant, treatment, moisture condition and permitted use. Count or bundle-check on arrival; photograph labels and damage; store timber off the ground and protected from standing water while allowing ventilation. For cement, confirm the type and grade specified for the work, intact bags and a dry, raised store. For reinforcement, use the design’s required bar size, grade and length. Never substitute structural materials simply because a shop says they are “close enough”; refer the change to the responsible professional.

Use staged purchasing rather than placing the entire build’s materials on an exposed site. Purchase against the next verified work package, the lead time and secure storage capacity. This reduces idle stock and makes reconciliation easier. It can mean more delivery trips, so include transport and offloading in the comparison. Record supplier quotes, order numbers, receipts, delivery notes, returns and any credit note; keep one owner-approved purchase log that the site team can see.

Turnkey: one scope can reduce hand-offs, not remove every risk

A full contract can give the homeowner one main point of responsibility for procurement, labour coordination, site supervision and delivery of the included work. That may be valuable when the owner is busy, lives far from the site or cannot coordinate several suppliers and trade crews. It can also make the programme easier to plan because purchasing decisions sit with the party responsible for the work sequence.

But turnkey is a scope description, not a magic guarantee. The contract is only price-certain if the drawings, quantities, specifications, assumptions, escalation rules, provisional sums, taxes and variation procedure are clear. A fixed-price promise can be undermined by vague finishes, incomplete drawings, late client selections, site conditions, unpriced external works or changes after signing. A completion date is meaningful only with defined start conditions, milestones, owner decisions, extensions and consequences for delay. “Performance guarantee” should identify the promised result, how it will be tested, who remedies a defect and for how long. Ask for the actual insurance schedule and certificate, confirm the insured party, project period, limits, exclusions and whether theft, third-party injury and damage to the works are covered. Do not assume a contractor’s policy covers every owner risk.

Before hiring a building contractor in Kenya, check their current National Construction Authority registration, practising licence and category against the type and value of works. NCA states that a person may not carry on contractor business without registration and a valid licence. Its local contractor guidance describes registration categories; its project registration page states that the developer/owner applies to register a construction project and lists a signed contract, approved drawings and a QS-signed/stamped BOQ summary among the requirements. The Authority’s page says the application should be made within 30 days of award. Check current NCA instructions for your specific project and confirm that the architect, engineer and quantity surveyor hold the relevant professional registration and current licence.

Material pilferage and waste: make the record visible

Loss is not only theft. Materials can be damaged in transport, stored badly, ordered in excess, cut inefficiently, contaminated, misused or wasted after a design change. A residential-frame study in Clay City and Kasarani, covering 32 active projects, identified issues including inadequate control and supervision, inexperienced workers or contractors, sub-quality purchases, misuse, poor storage and lack of security among factors contributing to waste in that sample. It is a local case study, not a national theft rate and not proof that one contract model always performs better. Its useful lesson is that purchasing, design coordination, storage and supervision all matter.

Reconcile materials by stage. For each key item, start with the BOQ allowance and approved purchase order; record what arrived, what was accepted or rejected, what was issued to the work, what was returned, what was damaged or wasted and what remains in store. Compare the installed quantity and work progress with the record. Photograph each delivery and store count, note the date and responsible person, and require written approval before a material substitution or a purchase above an agreed threshold. A shared spreadsheet or site app can make the record current for the owner and contractor; “real-time” only helps if entries are made promptly and supported by receipts.

A practical hybrid: keep the critical work coordinated

Many homeowners do not need to choose between personally buying every bag of cement and surrendering every selection to a contractor. A hybrid can keep foundations, concrete, reinforcement, structural masonry, roofing and concealed electrical or plumbing work under one coordinated main contract, while allowing the client to select a limited list of visible finishes—such as tiles, sanitaryware, taps, lights or door hardware—within agreed allowances.

For every owner-selected item, write down the specification, approved equivalent, quantity, budget allowance, supplier, delivery date, storage responsibility and who checks compatibility. Confirm that the item meets the designer’s and relevant professional’s requirements and that it arrives before installation. Agree who carries the cost of a late or defective item and how the contractor’s workmanship warranty applies when the client supplies the product. The contractor should not be expected to install an unapproved item that conflicts with the drawings, code, system warranty or other trades. Keep the list short: the more separate suppliers and delivery dates you create, the more coordination you retain.

Which approach suits your project?

• Consider client-supplied materials or labour-only if the work is clearly measured, you have time to visit and document the site, suppliers are dependable, storage is secure, and an independent QS or competent supervisor can check quality and quantities.
• Consider turnkey if you want a single party to plan and coordinate the included work, cannot manage frequent procurement decisions, or are building in a way where sequencing and specialist interfaces matter. Compare the contractor’s capacity, references, licence, programme and exclusions—not only the total.
• Consider a hybrid if you want control over selected finishes but do not want to manage the core structural procurement and site sequence. Define the owner-purchased list and keep everything else in the main scope.

None of these options protects a project from incomplete drawings, late decisions or poor supervision. A capable labour contractor with a detailed BOQ can outperform a poorly specified turnkey quote; a competent turnkey team can save a busy owner substantial time and reduce hand-offs. The choice depends on who can manage the responsibilities more reliably at a lower total cost.

Before you sign: a homeowner’s comparison checklist

1. Issue the same drawing revision, BOQ, material schedule and finish standard to every bidder. Identify who is responsible for design and approvals.
2. Mark each BOQ line as contractor-supplied, owner-supplied, provisional or excluded. State the brand/grade or performance specification and how substitutions are approved.
3. Compare VAT treatment, preliminaries, transport, offloading, storage, temporary services, waste removal, testing, external works and professional fees. Do not add VAT twice to a rate already stated inclusive of VAT.
4. Write a programme with procurement lead times, delivery dates, site access, inspection hold points, owner decision dates and the person responsible when a material is late.
5. Use documented payment milestones tied to measured work, approved materials or defined deliverables. State how advance payments are secured and how variations are valued and approved before work proceeds.
6. Agree site security, custody of materials, delivery-note sign-off, stock counts, damage/loss reporting, removal of surplus materials and who pays for reorders where responsibility is disputed.
7. Specify workmanship inspection, testing, defects correction, handover records, warranties, completion criteria, insurance evidence, termination rights and a dispute-resolution route. Have a Kenyan construction professional or lawyer review a significant contract.

Frequently asked questions

Does a labour-only contract always cost less than turnkey?

No. It usually moves material procurement and more coordination to the owner; it does not make those tasks free. Compare the labour quote plus all owner-supplied materials, delivery, supervision, storage, waste, replacements and delay costs with a turnkey proposal for the same scope.

Can I buy sand and timber myself to save money?

You can, but define the quantity and quality before buying. Check the delivered load before signing, retain delivery records, specify timber dimensions and treatment, protect stock and ask the design team about structural suitability. A lower price is not useful if the material is short, defective or unsuitable.

Does “turnkey” mean fixed price, a guaranteed completion date and insurance?

Not automatically. Read the signed contract for a complete scope, price basis, exclusions, change process, programme and extensions, defect obligations and insurance evidence. A label in a quotation is not a substitute for those terms.

What is the safest way to compare building contractors in Nairobi?

Provide identical drawings, a measured BOQ and finish schedule, then compare scope line by line. Verify current NCA registration and licence, review similar completed work, ask who supervises the site, and record payment, delivery, variation, insurance and handover terms before work starts.

Conclusion: buy accountability, not just a price

Labour-only, client-managed materials and turnkey contracting can all work. The cheaper choice is the one whose responsibilities match the owner’s time, experience, site access and ability to control quantity, quality, cash flow and programme. If you cannot personally supervise procurement, include a competent quantity surveyor or project manager in the comparison; if you can, make your controls as formal as the contractor’s.

For a transparent comparison, build from one measured scope, identify what each quote includes and reconcile every major material against the work completed. Discover GenZ Constructors' transparent turnkey contracting with real-time digital material reconciliation.

Sources and further reading

• National Construction Authority: Project Registration
• National Construction Authority: Local Contractor Registration
• IJERT: Residential construction material-waste study in northern Nairobi
• Cadreatech: IQSK 2025/2026-based Kenya construction cost calculator and assumptions