Why Planning Matters Before You Break Ground
Building an industrial unit is a significant investment, whether you are developing a warehouse, manufacturing facility, or distribution hub. The difference between a project that runs smoothly and one that spirals into delays and cost overruns almost always comes down to planning. Get the early stages right and the rest follows. Rush them and you will spend the entire build chasing problems.
This guide walks through the full process of industrial unit construction from initial site selection through to handover. It is based on our experience delivering industrial projects across Lancashire and the North West, and it covers what actually matters at each stage rather than just the theory.
Step 1: Site Selection and Due Diligence
Before anything else, you need the right site. That sounds obvious, but the number of developers who commit to a plot before doing proper due diligence is surprising. The site dictates everything that follows, from your planning strategy to your foundation design to your overall budget.
Key things to assess when choosing a site for industrial unit construction include ground conditions, flood risk, access for heavy goods vehicles, proximity to the road network, and availability of utility connections. A site that looks perfect on paper can become a nightmare if the ground is contaminated, the drainage infrastructure is inadequate, or the local highway authority has concerns about traffic generation.
Commission a desktop study early. This will flag any obvious environmental or geotechnical risks. If the site has a history of industrial use, you may need a Phase 2 intrusive investigation before you can finalise your foundation design. Spending a few thousand pounds on surveys at this stage can save tens of thousands later.
You should also check whether the site has any restrictive covenants, easements, or rights of way that could affect your layout. These are the kinds of issues that solicitors should pick up during the land transaction, but it pays to be aware of them from day one.
Step 2: Planning Permission
Industrial development in England falls under several use classes. The most relevant are Use Class E (which covers light industrial uses that can be carried out in a residential area without causing nuisance), Use Class B2 (general industrial), and Use Class B8 (storage and distribution). Understanding which class your operation falls into is important because it affects both your planning application and the conditions that may be attached to any permission.
For a straightforward industrial unit construction project on an established employment site, planning permission is usually achievable without too much difficulty. However, if you are proposing development on greenfield land, near residential properties, or in an area with environmental designations, you should expect a more involved process. Pre-application discussions with the local planning authority are well worth the time and cost. They give you an early indication of any concerns and allow you to address them before submitting your formal application.
Your planning application will typically need to include site plans, floor plans, elevations, a design and access statement, a transport assessment or statement, a drainage strategy, and possibly an ecological survey. Allow eight to twelve weeks for determination of a standard application, though complex schemes can take considerably longer.
Step 3: The Design Brief
Once you have a site and a realistic prospect of gaining planning permission, you need to develop your design brief. This is the document that tells your design team and contractor exactly what you need the building to do.
A good brief for an industrial unit should cover clear height requirements, floor loading capacity, door positions and sizes (including roller shutter specifications), office and welfare accommodation, power requirements, heating and ventilation strategy, and any process-specific needs such as extraction systems or reinforced floor areas.
Think carefully about future flexibility. Industrial buildings often change use over their lifetime, so designing in some adaptability now, whether that means additional structural capacity, provision for future mezzanine floors, or extra service connections, can add significant value. The cost of building in flexibility at the design stage is a fraction of what it would cost to retrofit later.
Step 4: Choosing Your Procurement Route
There are several ways to procure an industrial building project. The most common options are traditional procurement, where you appoint designers and a contractor separately, and design and build, where a single contractor takes responsibility for both design and construction.
For most industrial unit construction projects, design and build offers clear advantages. It provides a single point of responsibility, typically delivers faster programmes, and gives you cost certainty earlier in the process. If you want to understand more about how this approach works, our page on commercial fit out projects covers some of the principles involved.
Whichever route you choose, get your procurement strategy right early. Changing direction midway through a project is expensive and disruptive.
Step 5: Groundworks and Foundations
Groundworks are where theory meets reality. No matter how good your design is on paper, the ground conditions on site will have the final say on your foundation solution and, by extension, a significant chunk of your budget.
For most industrial units, foundations will be one of three types: traditional pad foundations beneath columns with ground beams between them, piled foundations where ground conditions are poor, or raft foundations for smaller units. The choice depends entirely on your ground investigation results and the structural loads involved.
Drainage is the other major element of the groundworks package. Industrial sites typically need foul drainage connections, surface water drainage (often incorporating attenuation to limit discharge rates), and possibly trade effluent connections depending on your operation. Sustainable drainage systems, or SuDS, are now a standard requirement on most new developments, so factor in the space and cost for attenuation tanks, permeable paving, or swales.
Do not underestimate the time groundworks take. On a large site with poor ground, this phase can run for several weeks before any steelwork arrives. It is also the phase most vulnerable to weather delays, so programme it accordingly.
Step 6: Structural Frame
The structural frame is the skeleton of your industrial unit, and for the vast majority of projects in the UK, that means a steel portal frame. Steel offers the best combination of span capability, speed of erection, and cost for industrial buildings. If you are interested in how steel frame structures work and what they offer, take a look at our steel frame buildings page.
Frame erection is one of the most visible phases of a project. A well-organised steel erection team can have the primary structure up in a matter of days on a typical unit, which is always an encouraging milestone for the client. However, the speed of erection on site depends entirely on the quality of the design, detailing, and fabrication that happened in the weeks and months before delivery.
Secondary steelwork, including purlins, side rails, eaves beams, and bracing, follows the primary frame. This secondary structure supports the cladding and roofing and also provides lateral stability to the building. It needs to be designed and detailed with just as much care as the main frame.
Step 7: Cladding and Roofing
Once the frame is up, the building gets its envelope. For industrial unit construction, the cladding and roofing system is a critical decision because it affects thermal performance, weather resistance, appearance, and long-term maintenance costs.
The most common options are composite insulated panels (which offer good thermal performance and fast installation), built-up systems using liner sheets, insulation, and outer sheets (which offer more flexibility in specification), and sometimes precast concrete panels for the lower walls where impact resistance is needed.
Roofing on industrial units is almost always profiled metal, either as part of a composite panel system or a built-up system. Key considerations include the roof pitch (which affects drainage and internal clear height), the provision of rooflights for natural daylight, and the inclusion of smoke ventilation if required by Building Regulations.
Do not skimp on the building envelope. A poorly specified or installed cladding system will cause problems for the entire life of the building, from condensation and heat loss to water ingress and premature deterioration.
Step 8: Internal Fit Out
Most industrial units include some element of office and welfare accommodation. This might be a simple two-room office with a kitchen and WC facilities, or it could be a substantial multi-storey office block attached to the main warehouse or production space.
The fit out of these areas is a separate package of work that runs alongside or follows the main shell construction. It includes partitions, suspended ceilings, floor finishes, mechanical and electrical installations, data cabling, and decoration. For more detail on what is involved in fitting out commercial spaces, visit our commercial fit out page.
Welfare facilities for the industrial area itself, including toilets, changing rooms, drying rooms, and canteen space, need to comply with the Construction (Design and Management) Regulations and the Workplace (Health, Safety and Welfare) Regulations. Get these right from the outset rather than trying to squeeze them in at the end.
Step 9: External Works
External works cover everything outside the building footprint, including access roads, car parking, loading yards, fencing, landscaping, and external lighting. On an industrial project, the external works package can represent a significant proportion of the overall cost, particularly where extensive hardstanding is needed for HGV manoeuvring.
The design of your external layout needs to account for vehicle tracking (making sure lorries can get in, turn, and get out safely), car parking numbers (which will be set by your planning permission), and surface water drainage. Heavy-duty areas like loading bays and HGV routes need appropriately designed pavements, typically concrete or heavy-duty asphalt, rather than standard car park construction.
Landscaping requirements are usually set by planning conditions. They may seem like a minor detail, but failing to complete landscaping can prevent you from discharging planning conditions and, in turn, delay occupation.
Step 10: Programme Planning and Cost Management
A realistic programme is essential for any industrial unit construction project. For a standard single-unit development, expect a construction period of around 20 to 30 weeks from breaking ground to handover, depending on the size and complexity of the building. Add to that the lead time for design, planning, and procurement, and you are looking at a total project timeline of 9 to 18 months from inception to occupation.
Cost management should be a continuous process, not something you do once at the start and then forget about. Establish a realistic budget early, include a meaningful contingency (10% is typical for a straightforward project), and monitor costs throughout the build. The biggest cost risks on industrial projects tend to be ground conditions, steel price fluctuations, and changes to the brief during construction.
Regular cost reporting and open communication between client and contractor are the best ways to avoid unpleasant surprises. If something is going to cost more than expected, you want to know about it as early as possible so you can make informed decisions.
Step 11: Handover and Occupation
The handover process is more than just handing over the keys. A proper handover should include a thorough snagging inspection, the provision of all operation and maintenance manuals, as-built drawings, test certificates, and warranties. You should also receive an EPC (Energy Performance Certificate) and, depending on the nature of the building, a fire risk assessment.
Allow time for a defects liability period, typically 12 months, during which the contractor is obliged to return and rectify any defects that emerge. This is standard practice in the industry and provides an important safety net for the client.
Make sure you have a clear plan for the transition from construction to occupation. This includes arranging your own building insurance, setting up utility accounts, installing your own equipment, and briefing your staff on the building’s fire safety arrangements and emergency procedures.
Getting Your Industrial Unit Project Right
Successful industrial unit construction comes down to thorough planning, realistic budgeting, and choosing the right team to deliver the project. Every stage from site selection to handover has its own challenges, but none of them are insurmountable when they are approached with the right level of expertise and preparation.
At Ashbarn Construction, we have delivered industrial projects of all sizes across Lancashire and the North West. If you are planning an industrial unit and want to discuss your project with an experienced contractor, get in touch with our team and we will be happy to help.
