Category: Hiring professionals

You do not always need a quantity surveyor to start thinking about building a house.

But once your project becomes serious, a quantity surveyor can become one of the most useful professionals on the team.

Their main role is to help you understand and control construction cost.

That can include:

• preparing cost estimates
• producing a Bill of Quantities
• advising on affordability
• comparing contractor prices
• tracking project expenditure
• assessing variations
• helping you avoid budget surprises

The larger and more expensive the project becomes, the more valuable that cost control can be.

If you are still at the early research stage, start with an indicative estimate using MyJenga.

Calculate my building cost →

What does a quantity surveyor actually do?

A quantity surveyor, often abbreviated as QS, is a construction-cost professional.

Their work can include:

• estimating what a project is likely to cost
• measuring construction work
• preparing Bills of Quantities
• advising on materials and specifications
• comparing tenders
• tracking spending during construction
• valuing completed work
• assessing changes and variations

In simple terms:

the architect helps define what you are building

while

the quantity surveyor helps you understand what it will cost.

Do you legally need a quantity surveyor for every house?

You can research affordability before commissioning a detailed BOQ. Once you prepare a construction project for registration, however, professional documentation matters.

The NCA project-registration checklist requires a BOQ summary signed and stamped by a quantity surveyor, along with approved drawings and other documents. It also requires project consultants to hold the appropriate registration and practising licences.

A limited appointment for cost planning or BOQ preparation differs from retaining a QS throughout construction. Agree the service scope with a registered QS and confirm the requirements for your project before work begins.

When is a quantity surveyor especially useful?

1. When your budget is tight

If you have a fixed budget, a quantity surveyor can help determine whether the design is realistic before construction begins.

That is much better than discovering halfway through the project that the house is too expensive.

For example, if your budget is KSh 8 million and the design is likely to cost KSh 11 million, you want to know that before excavation starts.

See How Much Money Do You Need to Start Building a House in Kenya?

2. When you want a detailed BOQ

One of the main reasons homeowners hire a QS is to prepare a Bill of Quantities.

A BOQ breaks the project down into measurable items that contractors can price.

That makes quotations easier to compare and gives you a clearer picture of where the money is going.

See What Does a BOQ Cost in Kenya?

3. When you are comparing several contractors

Suppose three contractors quote:

• KSh 8.4M
• KSh 9.1M
• KSh 10.2M

Without a consistent scope, you may not know why the prices differ.

One contractor may have excluded:

• wardrobes
• external drainage
• kitchen cabinetry
• some electrical work

while another includes them.

A QS can help normalize the comparison.

See How to Compare Construction Quotes in Kenya.

4. When the design is complex

A simple bungalow is easier to estimate than a large multi-storey house with:

• several bathrooms
• balconies
• retaining walls
• complicated roofing
• premium finishes
• extensive external works

The more complex the project becomes, the more assumptions can creep into casual estimates.

A QS helps reduce that uncertainty.

5. When construction will happen in phases

If you plan to build over time, cost planning can help you understand how much each stage is likely to require.

That can help you avoid beginning a phase you cannot finish.

See Can I Build in Phases in Kenya?

6. When you expect changes during construction

Changes cost money.

For example:

• moving walls
• adding a bathroom
• upgrading tiles
• changing the roof
• increasing room sizes

A quantity surveyor can help assess what those changes are likely to cost before you approve them.

What is the difference between a QS and a contractor estimate?

A contractor estimate is prepared by someone who may be bidding to do the work.

A quantity surveyor is usually advising the client on project cost.

Those are different roles.

A contractor may say:

“I can build this for KSh 9 million.”

A QS may break that KSh 9 million into:

• substructure
• walling
• roofing
• plumbing
• electrical
• finishes
• preliminaries
• external works

That gives you much more visibility.

Can an architect estimate construction cost?

Architects can give preliminary guidance on cost.

That can be useful early in the design process.

But detailed measurement, costing and cost control are core quantity-surveying functions.

So if the project is substantial, an architect’s rough estimate should not necessarily replace detailed cost planning.

Can you build without a BOQ?

Do not treat informal building practices as permission to skip required documentation. NCA lists a QS-signed and stamped BOQ summary among its project-registration requirements.

A detailed BOQ also helps define what is included, compare contractor bids and assess variations. The level of detail and the ongoing QS service should be agreed for your project.

Can a quantity surveyor save you money?

Potentially, yes.

The biggest financial value often comes from identifying problems before they become expensive.

For example, a QS may help reveal that:

• the house is too large for the budget
• certain finishes are disproportionately expensive
• contractor rates are unusually high
• quantities appear excessive
• a design change has a major cost effect

Avoiding one large mistake can sometimes matter more than the professional fee itself.

But hiring a QS does not guarantee a cheap project

A quantity surveyor cannot make an inherently expensive design cheap.

If you want:

• a large floor area
• premium imported finishes
• complex structural work
• elaborate roofing
• expensive glazing

the project can still cost a lot.

The QS helps make those costs visible.

That distinction is important.

Cost control is not the same as simply choosing the cheapest materials.

At what stage should you hire a QS?

A useful sequence is:

Early design stage

The QS can provide preliminary cost advice while the design is still flexible.

This is valuable because changes are easier to make before detailed drawings are complete.

Detailed design stage

Once architectural and structural drawings are developed, the QS can prepare a more detailed estimate or BOQ.

Tender stage

The QS can help compare contractor quotations.

Construction stage

They can also help monitor costs, value work completed, and assess variations.

You do not necessarily need the full range of services for every residential project.

Some homeowners may only need:

• a preliminary estimate
• a BOQ
• tender comparison

What should you ask a quantity surveyor?

Before hiring one, ask:

• Have you worked on similar residential projects?
• What exactly is included in your fee?
• Will you prepare a detailed BOQ?
• Will you help compare contractor quotations?
• Are revisions included?
• Can you assist during construction?
• What information do you need from my architect?

You want to understand the scope rather than simply comparing fees.

What if you are still just researching?

You probably do not need a detailed BOQ or full QS appointment yet.

At the early stage, what you need most is a reasonable affordability estimate.

For example:

• can you afford a 100 m² bungalow?
• can you afford a 200 m² maisonette?
• should you reduce the floor area?
• should you build in phases?

MyJenga is designed for that early stage.

Enter details such as:

• location
• house type
• floor area
• number of storeys
• finish level

and get an indicative construction-cost range.

Calculate my building cost →

Once the design becomes concrete, you can then move toward detailed professional costing.

How does a QS fit with the rest of the building team?

A typical residential project may involve:

• architect
• structural engineer
• quantity surveyor
• contractor
• specialist trades

Each role is different.

Architect

Focuses on the design and coordination of the building.

Structural engineer

Ensures the structural system is properly designed.

Quantity surveyor

Focuses on cost, quantities and financial control.

Contractor

Executes the construction work.

The team works best when each professional understands the same project and scope.

Do you need a QS for a small bungalow?

Maybe not for every stage.

A simple small bungalow may be manageable with a more limited quantity-surveying service.

For example, you might only commission:

• cost estimate
• BOQ
• contractor comparison

rather than full-time cost management throughout construction.

See Cost of Building a Bungalow in Kenya.

Do you need a QS for a large maisonette?

The argument becomes stronger.

A larger house may involve:

• more materials
• more trades
• more expensive finishes
• more contractor claims
• more potential variations

On a KSh 15M or KSh 20M project, cost-control mistakes can become substantial.

See Cost of Building a 4-Bedroom Maisonette in Kenya.

Frequently asked questions

Do I have to hire a quantity surveyor to build a house in Kenya?

NCA requires a BOQ summary signed and stamped by a QS for project registration. You can agree a limited professional appointment rather than assuming full-time cost management is always necessary.

However, a quantity surveyor can be very valuable for budgeting, BOQ preparation, contractor comparison and cost control.

What does a quantity surveyor do?

A QS helps estimate, measure, plan and control construction costs.

Is a BOQ prepared by a quantity surveyor?

Yes, detailed Bills of Quantities are normally prepared by quantity surveyors.

Can I get a BOQ without hiring a QS for the entire project?

Yes.

You can commission a limited service such as BOQ preparation rather than necessarily appointing the QS for every stage of construction.

Is a QS worth it for a small house?

It depends on the complexity and value of the project.

For a small straightforward house, a limited cost-planning service may be sufficient.

For a large or expensive project, detailed cost management becomes increasingly valuable.

Final takeaway

You do not necessarily need a quantity surveyor before you can start thinking about building.

But once your project moves from:

“I want to build a house”

to

“I have drawings, a budget and I am preparing to spend millions of shillings”

professional cost advice can become extremely useful.

A QS can help you:

• understand what the project should cost
• prepare a BOQ
• compare contractors
• manage variations
• monitor expenditure

Start with a broad affordability estimate.

Then, as the design becomes more concrete, move toward detailed professional costing.

Estimate the likely cost of your project with MyJenga →

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

See Roofing Costs in Kenya.

Plumbing

This can include:

• water supply
• drainage
• sanitary connections
• tanks and related systems

See Plumbing Costs in Kenya.

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

Calculate my building cost →

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.

Estimate the likely cost of your project with MyJenga →