If you are preparing to build a house in Kenya, you will probably hear the term BOQ fairly early in the process.
BOQ stands for Bill of Quantities.
It is a detailed document that breaks a construction project into measurable items and helps show what materials, labour and work are expected to be required.
A BOQ can be one of the most useful documents you have before requesting contractor quotations.
But how much does one cost?
There is no single universal BOQ price in Kenya.
The fee depends on factors such as:
- size of the project
- complexity of the design
- level of detail required
- whether architectural and structural drawings are complete
- whether the quantity surveyor is providing BOQ preparation only or broader cost-management services
For homeowners, the important thing is not simply to find the cheapest BOQ.
It is to get a document detailed enough to help you understand and control the cost of your project.
What is a BOQ?
A Bill of Quantities is a structured breakdown of the work required to construct a building.
It can include items such as:
- excavation
- concrete
- reinforcement
- masonry
- roofing
- doors and windows
- plumbing
- electrical work
- finishes
- external works
Each item is measured so that contractors can price the same scope of work.
This makes quotations much easier to compare.
Without a BOQ, one contractor may include work that another leaves out.
You may then end up comparing prices that look similar but are actually based on different assumptions.
Who prepares a BOQ in Kenya?
A BOQ is normally prepared by a quantity surveyor.
The Architectural Association of Kenya describes quantity surveyors as construction-cost professionals who prepare estimates, manage project costs and advise clients on affordability and value for money.
The Institute of Quantity Surveyors of Kenya similarly represents the profession and publishes construction-cost resources for the industry.
How much does a BOQ cost in Kenya?
There is no single official flat fee that applies to every residential project.
A quantity surveyor may charge based on:
- project value
- floor area
- complexity
- scope of work
- time required
- whether the service includes ongoing cost control
For a simple residential project, some professionals may quote a fixed fee for preparing the BOQ.
For larger or more complicated projects, fees may be calculated as part of a broader professional appointment.
Because fee structures vary, the safest approach is to request quotations from several qualified quantity surveyors for the same scope.
Ask specifically:
“How much will you charge to prepare a detailed BOQ from my completed architectural and structural drawings?”
That makes the quotations easier to compare.
Why is there no simple national BOQ price?
Consider two projects.
Project A
A compact 100 m² bungalow with:
- simple geometry
- one floor
- standard finishes
- straightforward structural design
Project B
A 300 m² maisonette with:
- multiple levels
- balconies
- several bathrooms
- complex roofing
- premium finishes
- extensive external works
Producing a detailed BOQ for Project B requires considerably more measurement and analysis.
It would therefore be misleading to expect both projects to cost the same to quantify.
What information does a quantity surveyor need?
A BOQ becomes more useful when the project design is sufficiently developed.
The quantity surveyor will typically need documents such as:
- architectural drawings
- structural drawings
- specifications
- schedules where relevant
If the drawings are incomplete, the QS may need to make more assumptions.
That reduces the precision of the estimate.
So the usual progression is:
Design → drawings → BOQ → contractor quotations
rather than preparing a detailed BOQ before the project itself has been designed.
What does a BOQ normally contain?
The exact structure varies by project, but it may include sections for:
Preliminaries
These can include general project requirements such as:
- site establishment
- temporary works
- supervision
- insurance
- contractor obligations
Substructure
This may cover:
- excavation
- foundation concrete
- reinforcement
- foundation walling
- hardcore
- floor slab
See our guide to foundation costs in Kenya.
Superstructure
This can include:
- walls
- columns
- beams
- upper floors
- structural elements
Roofing
The BOQ may measure:
- trusses
- roofing sheets or tiles
- ridges
- valleys
- gutters
- accessories
Plumbing
This can include:
- water supply
- drainage
- sanitary connections
- tanks and related systems
Electrical work
This may include:
- wiring
- conduits
- sockets
- switches
- distribution equipment
- lighting points
See Electrical Installation Costs in Kenya.
Finishes
This can include:
- plaster
- paint
- tiles
- ceilings
- doors
- cabinetry
- sanitaryware allowances
See House Finishing Costs in Kenya.
Why is a BOQ useful when getting contractor quotes?
Suppose you ask three contractors:
“How much will you charge to build my house?”
One says:
KSh 8.2M
Another:
KSh 9M
Another:
KSh 9.7M
Without a detailed scope, you may not know why the quotations differ.
One contractor may have included:
- wardrobes
- external drainage
- premium sanitaryware
while another has excluded them.
A BOQ gives each contractor a common basis for pricing.
That makes the comparison much more meaningful.
See our guide to how to compare construction quotes in Kenya.
Can a BOQ help prevent budget overruns?
It can help considerably.
A BOQ allows you to see where the expected money is going before construction begins.
It can help identify:
- expensive design choices
- large material quantities
- unrealistic allowances
- costly finishes
- potential opportunities to simplify the project
Construction Kenya specifically recommends obtaining a BOQ before building, noting that it provides a breakdown of project materials and costs and helps homeowners understand what they need to finance at each construction stage.
However, a BOQ cannot guarantee that the final construction price will never change.
Costs can still move because of:
- material-price changes
- design changes
- unforeseen site conditions
- variations
- additional work
It is therefore a cost-control tool, not a magical fixed-price guarantee.
Is a BOQ the same as a construction estimate?
Not exactly.
A preliminary construction estimate might tell you:
This house may cost approximately KSh 8M–9M.
A BOQ goes much deeper.
It breaks the project into individual measured items that can be priced.
That makes a preliminary estimate useful early in the planning process and a BOQ useful once the design has developed further.
A sensible progression is:
Early idea → cost-per-m² estimate → architectural design → BOQ → contractor quotes
You can begin with our construction cost per square metre in Kenya guide.
Do you need a BOQ for a small house?
Not every homeowner uses one.
However, even for a relatively small house, a BOQ can make budgeting and contractor comparison much clearer.
The larger and more expensive the project becomes, the more valuable detailed cost planning tends to be.
If you are unsure whether hiring a QS makes sense for your project, see Do You Need a Quantity Surveyor to Build a House in Kenya?
Can the contractor prepare the cost breakdown instead?
A contractor can provide a detailed quotation or cost breakdown.
That can still be useful.
However, the contractor is bidding for the work, while an independently appointed quantity surveyor is advising the client on project cost.
Those roles are not identical.
An independent BOQ can give multiple contractors the same document to price, making comparisons more consistent.
Should you choose the cheapest quantity surveyor?
Not automatically.
The BOQ may influence decisions involving millions of shillings in construction expenditure.
A very cheap but incomplete document could create false savings.
When comparing quantity surveyors, consider:
- professional qualifications
- experience with similar residential projects
- level of BOQ detail
- turnaround time
- whether revisions are included
- whether they can assist with tender evaluation
- whether ongoing cost-control services are available
The fee should be considered relative to the size of the project it is helping you manage.
Where do quantity surveyors get construction-cost data?
Professional quantity surveyors rely on market information, project records and industry cost resources.
The Institute of Quantity Surveyors of Kenya currently publishes a 2025/2026 Construction Costs Handbook, which it describes as a current industry cost resource.
That kind of data helps professionals benchmark materials, labour and construction costs when preparing estimates.
When should you get a BOQ?
A good time is usually after:
- the architectural drawings are substantially complete
- structural information is available
- major specification decisions have been made
But before:
- selecting a contractor
- committing to the construction price
- beginning major work
That gives you the opportunity to review the expected cost before becoming financially committed.
Estimate your project before commissioning a BOQ
If you are still at the early research stage, you probably do not need a detailed BOQ yet.
First determine whether the house you are considering is broadly affordable.
MyJenga lets you estimate your project based on:
- location
- house type
- floor area
- number of storeys
- finish level
Once your project has drawings and is moving toward construction, a detailed BOQ can replace broad estimates with much greater specificity.
Frequently asked questions
How much does a BOQ cost in Kenya?
There is no universal fixed price.
Fees vary according to project size, complexity, drawings, scope and the quantity surveyor providing the service.
The best approach is to obtain quotations from qualified quantity surveyors for the same defined scope.
Who prepares a BOQ?
A Bill of Quantities is normally prepared by a quantity surveyor.
Can an architect prepare a BOQ?
Architects may provide preliminary cost guidance, but detailed quantity measurement and construction cost management are core quantity-surveying functions.
Do I need architectural drawings before getting a BOQ?
For a detailed BOQ, you generally need sufficiently developed architectural drawings and relevant structural information.
Why do I need a BOQ?
A BOQ helps you:
- understand expected construction costs
- compare contractor quotations
- plan financing
- identify expensive items
- manage project expenditure
Is a BOQ worth paying for?
For a substantial construction project, detailed cost information can be valuable because the decisions involved may affect millions of shillings.
The value depends on the quality and scope of the service, not simply whether a document called a BOQ exists.
Final takeaway
There is no single fixed price for preparing a BOQ in Kenya.
The fee depends on the size and complexity of your project and the professional services you require.
More important than chasing the lowest BOQ fee is making sure the document gives you a credible picture of:
- quantities
- expected costs
- project scope
- contractor pricing
A good BOQ can turn:
“I think this house will cost about KSh 8 million”
into a much more structured understanding of exactly where that money is expected to go.
Start with an affordability estimate.
Develop the design.
Then use professional cost planning before committing to construction.
Leave a Reply