How to manage a commercial refurbishment project without going over budget

Why do commercial refurbishments go over budget?

Understanding the causes of overspend is the first step to preventing it. The most common reasons a commercial refurbishment exceeds its budget are not always the most obvious ones.

Incomplete scope at tender stage

When the project brief is vague or unfinished at the point of going to tender, contractors price what they can see. Anything that emerges later becomes a variation – and variations almost always cost more than the equivalent work priced competitively at tender.

Hidden building defects

Older commercial buildings frequently conceal problems that only become apparent once work begins: deteriorated structure, asbestos, substandard previous works, or services in worse condition than expected.

A thorough condition survey before the design stage identifies these risks early, when they can be priced and planned for rather than discovered mid-project.

Design changes during construction

Every design change after a contract is signed carries a cost premium. Changes that would have been straightforward to accommodate at design stage become disruptive and expensive once contractors are on site.

Freezing the design before construction starts, and maintaining discipline around change control throughout, is essential.

Underestimating professional fees and statutory costs

Many budgets focus on construction costs and treat professional fees, planning applications, building regulations, and CDM compliance as secondary considerations. In practice, these can add 15-20 per cent to a project's total cost and should be included from the outset.

Inadequate contingency

Industry guidance recommends a contingency pot of 10-15 per cent for most commercial refurbishment projects, and higher for older or more complex buildings. Projects that go to site with little or no contingency have no buffer when the unexpected occurs.

It is also worth being clear on what the project actually is. The distinction between a refurbishment and a renovation affects scope, cost, and the professional team required, and confusing the two at briefing stage can lead to a budget that does not reflect the actual work involved.

How much does a commercial refurbishment cost?

Commercial refurbishment costs vary significantly depending on the type of work, the building's condition, the specification level, and location. Broad indicative ranges are useful for initial feasibility, but they are not a substitute for a detailed cost plan prepared by a qualified quantity surveyor.

These figures are indicative and London projects typically sit at the upper end of each range. A building with significant hidden defects, asbestos, or poor previous works will cost more than a structurally sound property of equivalent size.

Our cost consultancy and quantity surveying services provide detailed cost plans at feasibility stage, giving you a reliable budget figure before any commitment is made. Ongoing cost monitoring throughout the project is also essential to ensure that figure holds.

What should a commercial refurbishment budget include?

A robust refurbishment budget covers more than construction costs. The following categories should all be included before a project proceeds.

1. Construction costs – The contractor's price for the physical works, including materials, labour, and preliminaries.
2. Professional fees – Architect, building surveyor, cost consultant, structural engineer, and mechanical and electrical consultant fees.
3. Statutory costs – Planning application fees, building regulations, and CDM compliance costs, including the appointment of a principal designer where required.
4. Contingency – A minimum of 10 per cent for modern buildings in reasonable condition, rising to 15–20 per cent for older stock, listed buildings, or projects where a full condition survey has not yet been carried out.
5. Decant and business continuity costs – For occupiers refurbishing a trading premises, the cost of temporary relocation, lost trading time, or phased working arrangements should be modelled as part of the overall project cost.
6. Post-refurbishment costs – Buildings that have been refurbished to a higher specification often carry higher running costs. A planned preventative maintenance programme budgeted from the outset avoids unexpected maintenance expenditure in the years following completion.

How do you manage a commercial refurbishment project effectively?

Sound project management is the discipline that holds budget, programme, and quality together from inception to completion. The following steps are the foundation of effective commercial refurbishment management.

Define scope fully before going to tender

The project brief should describe every element of the work in sufficient detail that contractors can price it accurately and completely. Gaps in the brief become gaps in the price and can fill later at cost.

Commission a measured survey before design begins

Designing to inaccurate floor plans is a common and costly mistake. A measured survey produces accurate CAD drawings of the existing building, giving designers and contractors a reliable baseline and reducing the risk of coordination problems on site.

Appoint a contract administrator

A contract administrator acts as the independent professional between client and contractor, issuing instructions, certifying payments, managing variations, and ensuring the contract is administered correctly throughout.

Without one, disputes are harder to resolve and cost control is weaker. Our contract administration service provides this function across all standard forms of building contract.

Manage change control rigorously

Every variation to the contract scope should be priced, approved, and documented before the work is carried out. Informal instructions or verbal agreements are a reliable route to disputed costs at the end of a project.

Review the programme regularly

Delays cost money, typically through extended preliminaries, prolonged professional fees, and in some cases, contractual claims. A realistic programme agreed at the outset, with regular progress reviews, reduces the risk of programme overrun becoming a cost overrun.

What is the role of a building surveyor in a commercial refurbishment?

A building surveyor brings together the technical, contractual, and cost management expertise that most commercial refurbishment projects require. For property owners, that means confident oversight of the project from initial feasibility through to completion and handover. For occupiers, it means an independent professional whose role is to protect their interests and their budget throughout the process.

Our building consultancy team provides the full range of services a commercial refurbishment requires, from early-stage condition and feasibility advice through to cost consultancy, contract administration, and CDM management.

We also offer space planning services for occupiers looking to make the most of a refurbished space, and work closely with our architectural design colleagues where projects require a more comprehensive design input.

Speak to us about a commercial refurbishment today

Whether you are planning a light refurbishment or a full fit-out, our building consultancy team can help you define your brief, establish a realistic budget, and manage the project through to completion.

Find out more about our refurbishment and fit-out services to see how we can help. Alternatively, get in touch by completing the form below or ringing 0800 051 2593 to arrange an initial conversation with one of our surveyors.