Understanding Commercial New Build Costs in the UK
If you are planning a commercial new build, the first question on your mind is almost certainly about cost. It is a fair question, but it is also one of the hardest to answer with a single figure. The commercial new build cost for a basic warehouse unit in Lancashire will look very different from a high-specification office building in a city centre, and the variables that sit between those two extremes are numerous.
What we can do is give you a realistic framework for understanding where costs come from, what drives them up or down, and how to plan your budget so that you avoid nasty surprises halfway through the project. This guide draws on our experience delivering commercial builds across the North West and is written for business owners, developers, and property investors who want straight answers rather than vague estimates.
Typical Cost Per Square Metre for Different Building Types
The most useful way to benchmark commercial new build cost is by looking at cost per square metre. These figures cover the building works themselves, including structure, envelope, internal finishes, and basic mechanical and electrical services. They do not include land purchase, professional fees, or VAT unless stated.
For industrial and warehouse buildings, you are typically looking at somewhere between 450 and 900 pounds per square metre. A straightforward portal frame warehouse with minimal internal fit out will sit at the lower end, while a unit with office accommodation, welfare facilities, and higher-specification services will push towards the upper range. If you are considering a steel frame building, the structural costs can be very competitive for larger spans, which is one reason steel remains the go-to choice for industrial projects.
Office buildings tend to fall in the range of 1,200 to 2,500 pounds per square metre, depending heavily on the level of finish. A basic open-plan office with standard suspended ceilings, carpet tiles, and simple mechanical ventilation will cost considerably less than a building with full air conditioning, raised access floors, high-quality joinery, and architectural features. The specification you choose has a direct and significant impact on the overall commercial new build cost.
Retail units generally fall between 800 and 1,800 pounds per square metre for the shell and core, though this varies enormously depending on whether you are building a standalone unit, a small parade, or part of a larger development. The tenant fit out on top of that is a separate cost entirely, and for some retail uses it can be as much as the base build itself.
Mixed-use developments, which combine retail or commercial space on the ground floor with offices or residential above, tend to be among the more expensive building types per square metre. The complexity of servicing different uses within the same structure, meeting separate Building Regulations requirements, and managing acoustic separation all add cost. Expect figures of 1,500 to 3,000 pounds per square metre depending on the mix and specification.
What Drives the Cost of a Commercial New Build
Knowing the per-square-metre ranges is a useful starting point, but understanding what pushes your project towards the top or bottom of those ranges is where the real value lies. Here are the main factors.
Location. Building in the North West is generally more affordable than the South East, but even within Lancashire there are variations. Sites in town centres with restricted access, limited laydown areas, and busy roads will cost more to build on than open sites on industrial estates where deliveries are straightforward and there is room to work. The local authority you are dealing with can also affect timelines and therefore costs, as planning and building control processes vary.
Ground conditions. This is one of the biggest unknowns on any new build project and one of the most common sources of cost overruns. If your site has poor bearing capacity, a high water table, contamination from previous uses, or is on a slope that requires significant earthworks, the foundation costs can escalate quickly. A thorough site investigation before you commit to a design is money well spent. We have seen projects where the foundations alone accounted for 15 to 20 percent of the total build cost because ground conditions were worse than expected.
Building specification. Every decision about materials and finishes has a cost implication. The difference between a standard blockwork and render facade and a curtain walling system can be hundreds of pounds per square metre. Similarly, the choice between natural ventilation and a full comfort cooling system, or between basic LED lighting and a smart lighting control system, will move the needle significantly. There is nothing wrong with a high specification if it delivers value for your business, but it is important to understand the cost impact of each decision.
Services and infrastructure. The mechanical and electrical services within a commercial building typically account for 25 to 40 percent of the total build cost, and on highly serviced buildings like laboratories or data centres, it can be even more. Beyond the building itself, you may need to fund new utility connections, drainage infrastructure, access roads, and external works. These costs are easy to underestimate at the early stages of a project.
Programme and timing. The length of the build programme directly affects the commercial new build cost because many overhead costs, from site management and welfare to scaffolding hire and insurance, are time-related. A longer programme means higher costs. Equally, if you need to build during winter months, weather-related delays and the need for additional protection measures can add expense. Starting on site in spring generally gives you the best chance of an efficient programme for most building types.
Design and Planning Fees
Before a single spade goes into the ground, you will need to invest in professional fees for design, planning, and statutory approvals. As a rule of thumb, expect professional fees to add between 10 and 15 percent to the construction cost, though this can vary depending on the complexity of the project and the number of specialists involved.
Your core design team will typically include an architect or building designer, a structural engineer, and a mechanical and electrical engineer. Depending on the project, you may also need a planning consultant, an acoustic consultant, a fire engineer, an ecologist, a transport consultant, and various other specialists. Each of these adds cost, but they also add value by ensuring the building is properly designed, compliant with regulations, and fit for purpose.
Planning application fees are set by the local authority and are relatively modest in the context of a commercial build, but the cost of preparing the application, including any supporting reports and assessments, can be significant. If your site is in a sensitive location or your proposals are contentious, the planning process can also take longer than expected, which has knock-on effects for your programme and cash flow.
Building Regulations approval is a separate process and another cost to factor in. Whether you use the local authority building control service or an approved inspector, there will be fees for plan checking and site inspections throughout the build.
Procurement Routes and Their Impact on Cost
The way you procure your commercial new build has a significant bearing on cost certainty, programme, and risk allocation. The two most common routes are traditional procurement and design and build.
With traditional procurement, you employ a design team to produce detailed drawings and specifications, then tender the work to contractors who price against that information. This gives you a high degree of control over the design and a competitive price, but it takes longer because the design has to be substantially complete before you can go to tender. Changes during construction can be costly because the contractor is pricing variations against a fixed specification.
Design and build is the more common route for commercial projects these days. You appoint a contractor early in the process, often on the basis of a set of employer’s requirements rather than a fully detailed design. The contractor then takes responsibility for completing the design and delivering the building for an agreed price. This approach generally offers better cost certainty and a shorter overall programme because design and construction can overlap. However, you need to be very clear about what you want in the employer’s requirements, because anything not specified will be delivered to the contractor’s standard, which may not match your expectations.
A good contractor will help you navigate this process and be transparent about where costs sit. If you are considering a design and build approach, it is worth having a conversation with potential contractors early, even before you have finalised your brief. At Ashbarn, we work with clients from the earliest stages to help them understand the commercial new build cost implications of different design and specification choices.
Contingency Planning
Every commercial new build budget should include a contingency allowance. The question is how much. For a straightforward project on a well-understood site with a clear brief, a contingency of 5 to 10 percent of the construction cost is reasonable. For a more complex project, or one where there are unknowns around ground conditions, existing services, or planning requirements, 10 to 15 percent is more prudent.
It is tempting to view contingency as money you hope not to spend, but in practice some of it will almost always be used. Ground conditions may be slightly different from the site investigation predictions. The client may want to make changes during the build. Utility companies may impose requirements that were not anticipated. A well-managed contingency is not a sign of poor planning. It is a sign of realistic planning.
One of the most effective ways to manage commercial new build cost is to make decisions early and stick with them. Late changes are almost always more expensive than early ones because they disrupt work that is already in progress and may require abortive costs. If you are going to invest time anywhere in the process, invest it in getting the brief and specification right before construction starts.
How Programme and Phasing Affect Your Budget
The build programme is not just about how long the project takes. It also affects cash flow, which for many businesses is as important as the total cost. A longer programme means your capital is tied up for longer before the building starts generating income, and it also means you are paying professional fees, insurance, and finance costs for a longer period.
Phasing can be a useful tool for managing cash flow on larger projects. For example, if you are building a mixed-use development, you might complete and let the retail units first, generating income that helps fund the upper floors. Or if you are building a large industrial facility, you might phase the construction so that you can occupy part of the building while the rest is still under construction.
Phasing does add some cost because of the need to manage interfaces between completed and in-progress sections, provide temporary services, and maintain safe access. But the cash flow benefits can outweigh the additional construction cost, particularly on larger projects.
Getting an Accurate Cost Estimate
If you are at the early stages of planning a commercial new build, the best thing you can do is talk to a contractor who has experience delivering similar projects. Online cost calculators and published guides can give you a very rough idea, but every project is different, and the only way to get a figure you can rely on is to have someone who understands construction look at your specific requirements, site, and programme.
We would always recommend getting a site visit and initial assessment before committing to a budget figure. This allows the contractor to understand the site constraints, access arrangements, and any obvious issues that might affect cost. It also gives you a chance to assess whether the contractor is someone you can work with, which matters more than many people realise on a project that might last 6 to 18 months.
At Ashbarn Construction, we provide honest, detailed cost guidance from the outset. Whether you are building a warehouse, an office, a retail unit, or something more complex, we can help you understand the true commercial new build cost and plan your project with confidence. We also deliver commercial fit out and commercial joinery works, so we can take your project from shell to fully fitted if needed.
If you are planning a commercial new build in Lancashire or the wider North West, get in touch with our team to discuss your project and get a realistic cost assessment based on your specific requirements.
