Developers & landlords · From first tenant to full occupation · Research checked 2026-09-05
A development’s water system must work when the first homes are occupied and when the last phase is complete. Those are different operating conditions. Before making a sales or tenancy promise, establish the source evidence, storage and distribution design, ownership and maintenance responsibilities. Treat the borehole as one component of the property’s long-term infrastructure, with accessible records and a funded operating plan.
Your first decision. Define phase-one demand and final-build demand separately, then decide how each phase will be commissioned and managed.
Complete water due diligence before promising supply
Collect land and access information, available source records, an occupancy programme and the master plan. Reserve space for the borehole headworks, tank maintenance, pump removal and electrical equipment. A point that is accessible during construction may become inaccessible after walls and parking are built. Resolve that conflict before mobilisation.
Identify the demand assumptions behind marketing statements. A nearby borehole or an initial water strike does not establish the supply available to every apartment. Ask the responsible designer to reconcile interpreted pumping-test results with the phased demand and any supplementary supply. Record the limits of the evidence and the contingency if the intended production is not available.
Commission the building system as well as the source
WHO’s building-water guidance links poor system design and management with preventable health risks. Its scope includes apartment blocks and commercial properties, reinforcing the need to consider the route from source through storage and plumbing to users. Water safety in buildings.
Map elevation differences, upper-floor pressure, booster duties and pipe routes. Specify accessible sampling points and maintenance isolation. Coordinate structural support for storage with the relevant designer. If different sources will be used, establish how they are connected and controlled, with appropriate protection against unintended cross-connections. Source approval does not demonstrate that the installed building network is ready for occupation.
Make a plan for empty units and future phases
EPA’s 2025 technical guidance identifies reduced occupancy, long networks and unused branches as contributors to stagnation. This is a water-quality mechanism to consider during phased operation, not a Kenyan legal standard quoted from a US publication. WaterSense at Work: Water Quality Considerations.
Ask how future branches will be managed until they enter service. Avoid leaving a vague instruction to “flush occasionally” without a responsible person, system assessment and written procedure. Review usable storage and turnover at low occupancy as well as the eventual peak. Recommission changed sections and update the drawings when later phases connect.
Make measurement and management transferable
EPA describes submetering as a way to identify tenant and equipment demand, supported by suitable meter sizing, access and maintenance. Whether and how residents may be charged requires a separate local legal and contractual assessment. WaterSense at Work: Metering and Submetering.
Separate common-area use, treatment losses and individual consumption in the monitoring plan. Record meter locations and starting readings at handover. Establish who owns the borehole, who may enter the equipment area and who pays for pump replacement. Provide the management company with service arrangements and a recurring budget, rather than transferring a folder of warranties without operating responsibilities.
One development, two occupancy conditions
Illustrative planning example. Assume 20 homes and an illustrative 500 litres per occupied home per day. This is a demonstration assumption, not a Kenyan design allowance or a claim about actual residents.
| Phase | Calculation | Household component |
|---|---|---|
| First occupation: five homes | 5 × 500 litres | 2.5 m³/day |
| Full occupation: twenty homes | 20 × 500 litres | 10 m³/day |
| Other uses | Common areas, cleaning and losses | Assess separately |
The final-build household component is four times the initial component. Compare storage turnover and operating arrangements at both stages, then add actual common uses and peak-flow requirements. Do not interpret the daily totals as pump discharge rates or as proof the borehole can support the completed scheme.
A quotation that matches this project
Use one coordinated scope across drilling, civil, plumbing and electrical packages. Mark who supplies each interface: tank controls, incoming cables, pipe trenches, testing and final reinstatement. Unassigned interfaces frequently become additional work during commissioning.
| Budget item | What changes the scope | What to ask for |
|---|---|---|
| Phased source provision | Tested production and future demand | Evidence-backed capacity assumptions and contingency |
| Storage and pressure zones | Building heights, usable volume and occupation stages | Hydraulic design and structural responsibilities |
| Metering and controls | Tenant/common uses and access | Meter schedule, drawings and commissioning readings |
| Management handover | Ownership, maintenance access and recurring obligations | Asset inventory and funded operating plan |
For a new Kenyan borehole, compare the survey, mobilisation, drilled metres, casing/screens, development, pumping test and laboratory analysis as distinct quantities. Then price the verified pump duty, power, storage, treatment and pipe route. Our planning calculator is an initial estimate; a complete quotation needs the actual site and inclusions. WRA’s permitting workflow distinguishes authorisation to construct works from the subsequent water-use permit.
Acceptance, records and the first month of operation
Require a phase-specific acceptance record before residents rely on the supply. Keep open defects and future works distinct from completed and verified items.
- Match as-built pipe routes, valve labels and meter identifiers to the occupied phase.
- Retain laboratory results and commissioning measurements for the complete supply route.
- Record maintenance access rights and the person authorised to isolate shared equipment.
- Give the managing entity an asset register, service contacts, warranties and a replacement budget.
Build the brief around the Kenyan site
Send the unit schedule, phasing dates, levels, master plan and source evidence. The county research helps frame geological due diligence; the building and operating arrangements need their own professional review.
- Borehole construction
- Pump selection and installation
- Water plumbing and storage
- Water analysis and treatment planning
- Nairobi research guide
- Kiambu research guide
- Water planning for individual homes
- Managing a Kenyan rental project from the UAE
Review your development water scope
Can one large tank serve every construction phase?
Possibly, but assess usable capacity, turnover, pressure and maintenance at each occupancy stage. The final-development demand does not describe the first months of operation.
Does a borehole automatically allow tenant water billing?
No legal conclusion follows from drilling alone. Clarify the applicable service requirements, ownership and tenancy arrangements with the relevant authorities and advisers.
What should residents receive at handover?
Provide clear operating responsibility, contacts, relevant water-quality information and a documented maintenance arrangement. The managing entity also needs the technical asset and commissioning records.
Sources, applicability and remaining checks
- Water safety in buildings — World Health Organization, 2011-02-01.
- WaterSense at Work: Water Quality Considerations — US Environmental Protection Agency, 2025-05.
- WaterSense at Work: Metering and Submetering — US Environmental Protection Agency, 2023-11.
This is development planning guidance, not an approval of a water-resale model or building design. WHO and EPA evidence supports water-system mechanisms; foreign standards are not automatically Kenyan requirements. No site yield, unit demand, easement, billing authority or structural capacity has been verified.