How to Read a BOQ in Kenya

To read a bill of quantities, or BOQ, start with the scope and drawing references, then check the descriptions, units, quantities, rates and amounts. Finish by identifying allowances, exclusions and the conditions that can change the price. The total only becomes useful when you understand what it buys.

For a homeowner building in Kenya, the aim is to have a clear conversation with the quantity surveyor and contractor before committing money. You do not need to measure every wall yourself. You do need to recognise an unanswered question and make sure someone takes responsibility for answering it.

This guide explains how to review a BOQ for a residential project. It includes a reading sequence, a comparison worksheet and questions to take into your next project meeting. Your project's measurement rules and contract determine how particular items are priced and paid.

What a BOQ tells you

A BOQ describes and quantifies work so it can be priced on a stated basis. A priced version also records the rates and amounts. It can help you see how the proposed construction cost is distributed across the project.

Keep it alongside the drawings, specifications and contract documents. A brief line in a bill may rely on a separate specification for the full material or workmanship requirement. An official Kenyan example, the Ministry of Water's Griftu tender BOQ, expressly connects its bill to the drawings, specifications and conditions. That is a useful reading habit; this public-works document is not a contract template for your house.

A BOQ should also tell you its limits. Which design revision was measured? What is provisional? Which packages sit outside the document? If those answers are missing, ask for clarification before treating the summary as a complete project budget.

Start with the document, not the total

Before checking prices, confirm that everyone is talking about the same project.

Suppose you have changed from a simple pitched roof to a usable roof terrace. A BOQ prepared before that decision may describe a different package of work. Correct multiplication will not resolve an outdated design basis.

Ask the team to issue a coordinated revision and identify what changed. Save the previous version, but mark it as superseded so it is not accidentally sent to another contractor.

Understand the BOQ columns

Most reading mistakes become easier to spot once you separate quantity from price.

Common units include square metres (m²), cubic metres (m³), metres (m), kilograms (kg), number (No.) and sum. They are not interchangeable. An area of finished wall cannot be compared directly with a volume of concrete.

For a normally measured item, quantity × rate = amount. Some entries instead contain allowances, lump sums or rates without an extended quantity; check their instructions rather than forcing every line into the same calculation.

A simple reading exercise

Imagine a line with a quantity of 24 m² and a rate shown as R. Its amount is 24 × R. If the confirmed quantity changes to 30 m², the arithmetic difference at that same rate is 6 × R.

This is a fictional arithmetic example, with no market price or project estimate. Whether the contract permits an adjustment, and which rate applies, must be checked separately.

The more useful question is often what the description covers. For floor tiling, ask where the tile selection, installation, substrate preparation and skirting are described. They may be together, separately measured or partly excluded. Avoid assuming that a heading such as “floor finishes” answers all four questions.

Read the notes and allowances

The introductory pages explain how the figures should be understood. Read the preambles and pricing instructions before comparing rates.

As a reference, RICS NRM 2 distinguishes measured work, preliminaries and allowances within detailed pricing documents. It is UK practice information, not a declaration that every Kenyan BOQ must use NRM 2. Ask your QS which measurement basis applies to your bill.

Three terms deserve attention:

• Preliminaries: project-wide requirements and costs associated with carrying out the works. Ask which site facilities, management, temporary services and obligations have been priced.
• Provisional sum: an allowance for work that is not sufficiently defined for firm pricing. Ask what remains undecided and how the eventual instruction and adjustment will be handled.
• Prime cost or PC allowance: an allowance associated with specified supply or specialist work. Check the document's definition and which installation, attendance or other additions sit outside it.

Do not read an allowance as confirmation that the final selection will fit that figure. Record what the allowance covers, who must make the decision, and when a firm proposal is needed.

A useful meeting question is: “Which decisions would let us replace these allowances with defined work before starting?”

Check what is outside the price

Prepare a scope checklist based on your own plot and brief. For every item, ask the team to mark included, excluded, allowed provisionally or not applicable, and give a document reference.

Consider:

• Site access, clearance and any existing structures to be dealt with.
• Groundworks whose scope depends on the site investigation and design.
• Boundary works, gates, paving, landscaping and stormwater drainage.
• Water storage, pumping and the selected wastewater solution.
• Electrical and plumbing installations, fittings and testing.
• Kitchen fittings, wardrobes, appliances and other owner selections.
• Utility connection work and any separate provider charges.
• Professional services, approval costs and other client-side expenses.

This is a discussion checklist, not a claim that every house needs every item or that every BOQ excludes them. A package might appear in another bill, be supplied directly by the owner, or genuinely fall outside the project.

For example, “plumbing included” leaves room for questions. Does the scope include the fittings you have chosen? Where are the tank and pump described? Who handles external pipework? Use the MEP engineering service information to frame the systems discussion, then ask for your project's precise scope in writing.

Distinguish the contractor's priced works from the whole-project budget. Keep client-side expenses and any separately held reserve visible, without counting the same allowance twice.

Compare contractors on the same basis

Send each contractor the same issue of the drawings, specifications and BOQ, together with the same clarification process. Record any later amendments so every bidder can price the current scope.

Then compare the returned documents, not just the last page. A lower figure may reflect a different assumption, an exclusion or a genuine pricing difference. Find out which before deciding it represents better value.

Use this worksheet during tender review:

Ask your QS to explain significant differences and show their effect on the comparison. Preserve the original tender and record clarifications separately; do not silently edit a contractor's submission to make it look comparable.

A blank price deserves a question. It might be included elsewhere, omitted, or left for clarification. It does not automatically mean the work is free, and its contractual treatment should not be guessed.

Price is also only one part of contractor selection. Discuss the delivery team, relevant capability, programme and proposed supervision alongside the financial comparison.

Use a query log before signing

A clear question is easier to resolve than a general complaint that the bill “looks expensive”. Give each issue an item reference and describe the decision you need.

Keep the response, its author and its date with the query. Where the answer changes the scope or price, ensure it appears in the agreed documents rather than remaining only in a meeting note or message.

The goal is to reach a version everyone can identify and explain. A folder containing several similarly named spreadsheets without a clear final issue creates avoidable confusion.

What happens after construction starts?

Keep the agreed pricing documents available during construction. When someone proposes a change, record the affected work, reason, pricing basis and programme implications. Obtain the instruction or approval required by your contract before treating the change as agreed.

Do not assume every quantity difference changes the contract sum. The treatment depends on the contract and the circumstances. Equally, a BOQ total is not an unconditional promise that every later design choice is already covered.

For payment discussions, ask the appointed professionals to explain the work being valued, supporting records and relevant contract provisions. Distinguish work completed from money merely requested. If an interim statement includes materials on site, ask how their eligibility and evidence have been checked under the contract.

A simple owner record can track the original agreed amount, approved changes, pending proposals, certified payments and payments actually made. Keep those categories separate so a proposal is not mistaken for approval or a certificate for a bank transfer.

Construction project management helps coordinate these decisions and records. The allocation of certification and contractual duties should be explicit in the professional appointments and building contract.

Questions homeowners ask about BOQs

Is a BOQ the same as an estimate or quotation?

They serve different purposes, although a priced BOQ can support either. An estimate expresses an assessment of cost on stated assumptions. A contractor's quotation is an offer for a stated scope and conditions. A BOQ organises described quantities and, when priced, rates and amounts. Ask what stage the document represents rather than relying on its filename.

Who should explain or check my BOQ?

Start with the person who prepared it and involve your appointed quantity surveyor in measurement, pricing and tender queries. BORAQS' quantity-surveying training logbook includes preparation of bills and related cost-management work within professional training. Check a practitioner's current registration and agreed scope separately; this guide does not certify anyone's credentials.

Can I use the BOQ as a materials shopping list?

Do not order directly from quantities without checking what they measure. A work item may combine materials and installation, and purchasing involves product sizes, packaging, wastage assumptions, delivery and storage. Ask the responsible team to prepare the procurement information for the work being scheduled.

Does a BOQ stop construction costs changing?

It helps make the starting scope and pricing clearer. It cannot remove design changes, unresolved selections or every site uncertainty. The practical protection is a coordinated design, transparent assumptions and a documented process for decisions and changes.

Can I check the price using a cost-per-square-metre calculator?

Use an indicative calculation for early orientation, then compare its inclusions with your actual design and scope. It does not verify measured quantities or tell you whether a tender is complete. Our construction cost calculator provides an indicative starting point; a drawing-based review is a separate service.

Take these questions to your next meeting

Before accepting a construction price, make sure you can answer:

1. Which drawing and specification revisions does this bill cover?
2. Which parts are measured and which remain allowances?
3. Where are the exclusions and owner-supplied items recorded?
4. Have competing prices been compared on the same scope and tax basis?
5. What decisions are still needed, and who must make them?
6. How will changes and payment applications be assessed under the contract?
7. Which issue of the documents will form the agreed basis for the work?

If you cannot answer one, turn it into a written query with a named person responsible for closing it.

For help defining a costing brief, request a fee proposal or read about our cost-estimation service. Detailed drawing-based costing is paid work. You may share available plans with your enquiry, but uploading plans is optional; the scope, fee and deliverables should be agreed before the service starts.

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Cover photograph: Lucas Kepner on Unsplash, used under the Unsplash License.