Most building projects that go wrong don't fail because of poor workmanship. They run into trouble because the budget wasn't realistic, the scope kept changing, decisions came late or nobody was clearly in charge of keeping everything on track. That's where project management and quantity surveying come in. This guide explains what each role does, when it's worth having, and how it can help on extensions, renovations, new builds and commercial projects in Cornwall.
What is a quantity surveyor?
A quantity surveyor, often called a QS, specialises in the cost side of construction. Their job is to help you understand what a project should cost, get fair prices and keep spending under control as the work progresses. Typical QS tasks include:
Cost planning: estimating the likely cost of a design at an early stage, so you know whether it fits your budget before you spend heavily on detailed drawings.
Preparing tender documents: setting out the work in a structured way, sometimes as a bill of quantities, so contractors price the same thing and quotes can be compared fairly.
Analysing tenders: checking quotes for gaps, exclusions and unusual prices.
Valuations: assessing work done on site so payments match progress.
Managing variations: pricing changes as they arise, so you can decide with the cost in front of you.
Final account: agreeing the final cost at the end of the project.
What does a project manager do?
A project manager focuses on delivery: getting the project built to the right standard, on time and within budget. They act as a central point of contact and keep everyone working towards the same plan. Their role can include:
Setting up a realistic programme from design through to completion.
Coordinating designers, engineers, contractors and suppliers.
Tracking progress on site and flagging delays early.
Making sure approvals, such as planning conditions and Building Regulations inspections, are dealt with at the right time.
Organising regular updates and making sure decisions are made when they're needed.
Managing risks and helping resolve problems before they become disputes.
On some projects one person or firm covers both roles. On others, they're separate. Either way, the aim is the same: fewer surprises.
When is it worth having project management or a QS?
Not every job needs them. A straightforward small extension with a clear design and a trusted builder may run smoothly without. Independent support is particularly useful when:
The project is large or complex, such as a new build, barn conversion or major renovation.
You live away from Cornwall, for example if you're renovating a second home or holiday let and can't visit the site regularly.
The budget is tight, and you need confidence that the design and the quotes stack up.
Several contractors are involved, and someone needs to coordinate them.
It's a commercial project, where programme and cost certainty matter to a business. See our commercial building services page.
Cost control in Cornwall's building market
Some factors make cost planning especially important here. Rural and coastal sites can have difficult access, which affects deliveries, plant and labour. Older stone buildings often hide problems that only appear once work starts. Planning conditions in conservation areas and National Landscapes may call for specific materials, such as natural slate or lime render. Busy periods can also affect availability of trades and materials. A good cost plan allows for these, with a sensible contingency rather than an optimistic figure.
Contracts and paperwork
Clear paperwork protects everyone. Whatever the size of the job, it's sensible to have:
A written scope of work and specification.
An agreed price, with any provisional sums clearly identified.
A suitable building contract, such as one of the standard forms used in the industry for homeowner or minor works.
An agreed process for variations and payments.
A programme with key dates.
A project manager or QS can help put these in place, so expectations are clear from the start. Our process page shows how we approach projects from first conversation to handover.
Project management and QS FAQs
Is a quantity surveyor only for big commercial jobs?
No. QS services are common on larger residential projects too, such as self-builds, barn conversions and major extensions, where an early cost plan can prevent expensive redesigns. Our self-build guide explains where this fits.
Does project management add to the overall cost?
There's a fee, but good management can reduce overall cost by avoiding delays, rework and unplanned changes. Whether it's worthwhile depends on the size and complexity of the project.
Can a builder provide project management?
Yes. Many builders manage their own projects and subcontractors. Independent project management and QS services are also available if you want a separate check on cost and progress.
Talk to us about your project
Cornish Building Company offers project management and QS services across Cornwall, alongside our building work. Call us on 01208 816991 or contact us to discuss how we can help.
