A 1,800m² mixed-use trade park development for a regional commercial property developer in Bury, Greater Manchester — four steel-frame trade counter units suited to B2/B8 occupiers, sized at approximately 450m² each, sharing a common customer parking forecourt with EV charging on the customer side, individual roller-shutter rear loading to a service access lane, demising walls between units for full fire and acoustic separation, separately-metered services per unit, and pre-agreed signage zones aligned to the letting agent's marketing material. Eleven-month programme delivered as a phased handover — two pre-let units operational at week 32, two speculative units completed at week 44.
A regional commercial property developer specialising in trade park and small-shed industrial product across the North West commissioned a 1,800m² multi-unit trade park development on a 1.4-acre serviced plot on the edge of Bury, Greater Manchester. Trade parks are a specific commercial product: four (or five, or six) standardised steel-frame units sharing a common customer forecourt, each suited to a different tradesperson-facing tenant — Toolstation, Howdens, Screwfix, plumbing or tile merchants, light industrial occupiers. The whole scheme is engineered for lettability rather than for one operator's exact specification.
The site arrived to us serviced and planning-permitted in principle for a B2/B8 development. The use class flexibility was deliberate: B2 (general industrial) and B8 (storage and distribution) widen the tenant pool for the letting agent, and a unit can be re-let between B2 and B8 occupiers across its lifetime without further planning. Our role: take it from a serviced field to four operational units, two of them with named pre-let tenants requiring landlord-side enabling works at handover and two completed to a high speculative-let standard ready for the letting agent to market through to occupancy.
We were one of three contractors tendering. We won the work because our methodology document was the only one to (a) treat the four units as a single shell-and-core programme with phased handover rather than as four sequential builds, (b) coordinate the demising wall fire and acoustic specification at design stage with the letting agent's input on tenant likelihood, and (c) align the signage zones, customer-side branding opportunity and forecourt finishes with the letting agent's marketing material before site start so the units could be photographed for marketing as soon as the cladding went on. Eleven months on site, two pre-let handovers at week 32 and the speculative pair at week 44, all four units let by month 14 from contract signing.
The brief came from the developer's Development Director and the appointed letting agent jointly, with named involvement from a B2/B8 design consultant on tenant fit-out provision. Priorities, in their stated order:
Multi-unit trade park developments are operationally simpler than a big-box warehouse and architecturally simpler than a Cat-B fit-out, but have their own specific constraints around lettability, multi-tenant separation and phased handover. Six interrelated challenges had to be locked down before site start.
The whole scheme depends on each of the four units being identical at shell level so the letting agent can offer any unit to any tenant without committing to a unit-specific spec at lease signing. We engineered the units identically at shell-and-core: same steel grid, same eaves height (7m clear), same slab grade, same demising wall spec, same trade counter glazing module, same mezzanine position, same roller-shutter door size and position. Tenant-specific Cat-A2 fit-out provisions (counter joinery, racking, cooling, branding) left as add-on works costed against named tenants when the lease lands.
Multi-unit developments live or die on the demising walls between tenants. We specified each demising wall to 60-minute fire resistance and Rw 50dB acoustic separation, taken from slab to roof slab (not just to suspended ceiling height), with continuous compartmentation through the roof void above. Separately-fed electrical and water services either side of every demising wall to allow independent isolation. Independent acoustic and fire compartmentation inspections by the local Building Control authority at first-fix and at completion.
Trade parks succeed on customer experience: the tradesperson in a van wants to park, walk in, find what they need, pay, load up, leave. The customer-facing front of each unit must work at retail standard while the rear must work at light industrial standard. We engineered the forecourt with 28 customer parking bays sized for typical Transit-class vans (5.5m long, 2.4m wide bays with 6m aisle), kerb-line dropped from forecourt to unit thresholds for level loading-trolley access, and customer-facing glazed shopfronts to each trade counter zone in a uniform aluminium frame system across all four units.
The rear service lane separates customer-facing activity from goods-in delivery. We laid the rear lane as a 6m-wide reinforced concrete strip running the full width of the development with turning heads at both ends sized for 10m rigid HGV access (not full articulated — the typical tenants take rigid wagon deliveries, not artic), individual roller-shutter doors at 4m width per unit with electric operation, and rear pedestrian access doors with simple latch security for staff-only goods-in handover.
The two pre-let tenants (Toolstation and a regional plumbing merchant) signed agreements for lease before site start with handover dates set at week 32. The speculative pair would complete at week 44 once the letting agent had time to market. Programme had to deliver two operational handovers, not one. We sequenced the build to bring all four shells, all four roofs, all four cladded envelopes and the entire forecourt and rear service lane to completion together at week 28, then completed the two pre-let units' tenant-specific landlord-side enabling works ahead of the speculative pair. Both handover dates met.
Speculative units need to be lettable as soon as they're photographable, which on a developer-led trade park scheme is typically as soon as the cladding goes on. The letting agent was active in marketing from week 22 onwards: drone photography of the partially-cladded scheme at week 24, full external photography at week 28, internal photography at week 35. We coordinated the build sequence to keep the customer-facing forecourt presentable from the cladding-complete milestone — finished kerb lines, line-marking, signage zones primed and ready for tenant decals, EV charging visibly installed.
Multi-unit trade park developments succeed or fail on three things: standardising the shell so each unit is genuinely tenant-agnostic, engineering the demising separation to a spec that holds up to multi-tenant occupancy without ongoing landlord disputes, and sequencing the programme to a phased handover so pre-let units can go operational before the speculative pair completes. Our approach was structured around four disciplines.
Single shell-and-core programme, not four sequential builds. The two competing tenders treated the four units as four sequential builds — build unit 1, then unit 2, then unit 3, then unit 4. We treated it as a single shell-and-core build with all four units progressing in parallel through every workstream: foundations together, slab together, steel together, cladding together, then unit-specific finishing layered on top. Programme came in at 11 months against competing-bid averages of 14-16 months because parallel-track build-out is significantly faster than serial.
Demising spec at design stage with letting agent input. The letting agent's view on the tenant likelihood mix matters at design stage, not at lease stage. We worked with the letting agent in pre-construction to identify the four most likely B2/B8 tenant categories on the regional trade park market and engineered the demising walls to handle the highest-acoustic-load combination among them (Howdens or a tile merchant adjacent to a Toolstation: 50dB the agreed minimum). Spec held independently to fire and to acoustic, fully tested at first-fix and completion.
Phased handover sequenced from quote stage. Two operational handovers in one project means two handover packs, two Building Control completion inspections, two BREEAM assessor visits at the relevant stages, two site security restructures (the operational pre-let units fenced off from the still-active site for the remaining 12 weeks), and two sets of tenant-side IT, signage and Cat-A2 enabling works at distinct points in the programme. We costed both handovers at quote stage and held the dates as contractually distinct milestones.
Letting agent treated as a stakeholder, not a viewer. The letting agent had named involvement from week 1: design-stage input on customer-facing finishes, signage zone agreement, drone photography access from week 22, marketing material accuracy review at week 30. By the time the speculative pair was complete at week 44, the letting agent had been marketing them for roughly 14 weeks; both let within four weeks of physical completion.
Forty-four calendar weeks (eleven months) on site, preceded by 5 weeks of pre-construction (planning conditions discharge, BREEAM pre-assessment, ground investigation, letting agent design coordination). Site programme sequenced against two operational handovers: pre-let pair at week 32, speculative pair at week 44.
Planning conditions discharged: tree survey, surface water management plan, signage zones agreed in principle. BREEAM pre-assessment with registered assessor, credit pathway agreed to Good target. Ground investigation: 4 trial pits, 3 boreholes to 8m, geotechnical engineer's report. Letting agent design coordination: customer-facing finishes, totem signage spec, marketing photography schedule. Steel-portal frame designed for the standardised four-unit grid, 6-week fabricator lead time placed.
Site cleared, topsoil stripped and stockpiled. Survey and setting out of the four-unit grid, customer forecourt, rear service lane, totem signage position, attenuation pond. Drainage runs laid for foul, surface water and pond outflow.
CFA bored piles installed across the column grid for all four units in parallel, 14 columns total, 450mm diameter, 8m typical depth. Pile caps cast over each pile. Continuous ground beam around the perimeter of each unit and along each demising line. Service ducts laid to each unit's separately-metered position.
FM3 standard power-floated slab poured one pour per unit, 4 pours total of approximately 450m² each, at 175mm thickness with high-strength fibre reinforcement. Slab to FM3 tolerance throughout. Independent flatness survey at week 9: 99.4% within FM3, no failure points.
Steel arrived in two deliveries from the fabricator. 50-tonne mobile crane on site for the duration. All four unit shells erected in parallel: eaves columns set, primary 14m clear-span rafters lifted, secondary purlins bolted up, demising-wall spine columns set on continuous ground beams. Roof structure complete across all four units at end of week 13.
Demising walls built first, taken slab-to-slab through the roof void to maintain compartmentation (60-minute fire, Rw 50dB acoustic). Roof cladding installed: composite insulated panel system. Wall cladding installed across all four elevations in matching profile. Trade counter customer-front glazed shopfronts framed and ready for glass install. Friday week 17: full envelope watertight across all four units, signed off as the project's primary hold-point. Letting agent drone photography Saturday week 17.
Customer-facing glazed shopfronts installed across all four trade counter zones in matching aluminium frame system. M&E first fix throughout each unit: high-bay LED lighting circuits, small power, separately-metered service positions, BMS cabling. Mezzanine structures erected at the rear of each unit at 40m² per unit, composite floor decks fitted, separate stairs framed.
Customer parking forecourt: 28 bays line-marked, 6 with EV charging stanchions (active) plus future-proof cabling for a further 8. Rear service lane laid in reinforced concrete with turning heads sized for 10m rigid HGVs. Roller-shutter rear loading doors fitted at all four units. Letting agent external photography Friday week 24 with EV charging visibly installed and forecourt line-marking complete.
Two pre-let units (Toolstation and the regional plumbing merchant) received tenant-specific landlord-side enabling works: tenant-spec lighting circuits, tenant-spec data outlets, tenant-spec cooling on the trade counter zone, tenant-spec floor finishes in the customer area. Both units fully decorated. Sprinkler heads dropped to tenant-spec ceiling levels. Mezzanine offices fitted out as tenant-specified.
Building Control completion inspection for the two pre-let units. BREEAM evidence pack assembled for the relevant credit categories. Snagging round at the two pre-let units identified 21 items; 17 cleared by handover. Handover at week 32: keys, project file, O&M manuals, sprinkler test certificate, structural sign-offs, BMS operating documentation, signage zone agreed positions, EV charging certification. Two pre-let tenants began their own internal Cat-B fit-outs the following Monday.
Two speculative units brought to high speculative-let standard: full painted internal walls, sealed power-floated slab, lighting installed and commissioned, mezzanine offices in shell-and-core finish ready for tenant fit-out, customer-facing glazed shopfronts and trade counter zone fitted to a clean letting standard. Site security restructured: operational pre-let units fenced off from the active site, separate site access for the remaining works.
Letting agent internal photography Friday week 38 with both speculative units cleaned, lit and presentation-ready. Marketing material live with the letting agent's portal by Monday week 39. BREEAM evidence pack assembled for the speculative pair across the relevant credit categories. Final BREEAM assessor site visit week 41. Sprinkler quarterly tests on the operational pre-let pair clean.
Building Control completion inspection for the speculative pair. Final snagging round identified 13 items; 11 cleared by handover. Speculative pair handover at week 44: keys to developer for letting-agent management, full handover pack delivered, BREEAM Good certificate issued for the development at 58.4% scoring 6 weeks post-handover. Both speculative units had viewing activity during the marketing period; both let within 4 weeks of physical completion (one at week 47, one at week 49 from contract signing). All four units operational and let by month 14.
The technical detail behind a 4-unit trade park engineered for multi-tenant lettability and phased handover.
4 identical steel-frame units at approximately 450m² GIA each. 14m clear-span column grid, 7m clear eaves height. 175mm power-floated slab to FM3 tolerance throughout. Eaves columns 305 × 165 UB, primary rafters 406 × 178 UB. Each unit identical at shell-and-core for full tenant-agnostic lettability.
Compartmentation walls between units: twin-leaf metal stud with double 15mm fire-rated plasterboard each side, mineral wool fill, taken slab-to-slab through roof void. 60-minute fire resistance, Rw 50dB acoustic separation. Continuous compartmentation through roof void above. Independent fire and acoustic Building Control inspections passed.
Customer-facing trade counter zone at the front of each unit, approximately 60m². Aluminium frame glazed shopfronts in matching specification across all four units, 12.7mm laminated glass to reception, level-access threshold from forecourt. Branded fascia signage zone above each entrance.
40m² rear mezzanine to each unit. Steel mezzanine structure, composite floor deck, separate stair access. Shell-and-core finish for speculative units, tenant-specific fit-out for pre-let units. Suitable for office or staff welfare facility per tenant requirement.
6m-wide reinforced concrete service lane running the full width of the development. Turning heads at both ends sized for 10m rigid HGV access. Individual electric roller-shutter doors at 4m width per unit. Pedestrian access doors with simple latch security for staff-only goods-in. Lane separated from customer forecourt by building line.
28 customer parking bays sized for Transit-class vans (5.5m long, 2.4m wide, 6m aisle). 6 active EV charging bays at 22kW each, future-proof cabling pulled to a further 8 bays. Cycle parking near unit fronts. Single shared totem signage at the forecourt entrance listing all four tenants.
Wet-pipe sprinkler protection across all four units to standard occupancy hazard 3, town main feed with backflow prevention, separate isolation valves per unit. Each unit independently fire-compartmentated through demising walls. Mains-wired smoke detection on a per-unit basis. Hydraulic test certified at first commissioning.
BREEAM Good rating, 58.4% scoring across the development. LED lighting throughout with daylight-sensor dimming, low-flush WCs, 6 EV charging bays plus 8 future-proof, attenuation pond doubling as ecology habitat, cycle parking, FSC-certified timber, recycled aggregate in non-structural concrete.
A 4-unit, 1,800m² multi-tenant trade park development on a 1.4-acre serviced plot on the edge of Bury, delivered against an 11-month fixed-price contract with no variation orders, the slab measured at 99.4% within FM3 tolerance, the demising compartmentation passed at first Building Control inspection on both fire and acoustic spec, BREEAM Good certified at 58.4% scoring, the pre-let pair operational at week 32 against the contracted week-32 milestone, and the speculative pair completed at week 44 against the contracted week-44 milestone. Both speculative units let within four weeks of physical completion through the developer's appointed letting agent. All four units occupied and trading by month 14 from contract signing.
The developer's Development Director's framing, twelve months from full occupancy: "The shell-and-core was a clean as-built, the demising specification has produced zero acoustic complaints from any tenant in the first year, and the letting agent had the speculative pair on the market for fourteen weeks before they completed, which is why they let in four weeks. We've already engaged Building Group to quote our next two trade park sites in the region." Trade counter footfall across the four tenants is averaging roughly 480 customers per week per unit (combined ~1,920) against an industry comparator of ~350. Occupancy rate at month 14 is 100% with all four leases on five-year terms.
We had three contractors quote on this development. The two competing bids both proposed building the four units sequentially, which would have put us at fourteen to sixteen months on site rather than eleven, and would have given us a single handover at the end rather than a phased one. Building Group came back with a parallel-track build-out across all four shells, costed in for two distinct operational handovers at week thirty-two and week forty-four, and proposed coordinating the letting agent into the design stage so the speculative pair could be marketed from drone-photography stage onwards. Every part of that delivered. The pre-let pair handed over on the contracted date, the speculative pair handed over on the contracted date, both speculative units let within four weeks of completion, and we have had zero acoustic complaints from any of the four tenants in the first year of occupancy. Building Group will be quoting our next two regional trade park sites. We would recommend them to any commercial property developer working on multi-unit schemes.
If you're a commercial property developer working on a trade park scheme, a multi-unit light industrial estate, a small-shed development or a mixed B2/B8 scheme, we'll come out for a free site visit, walk the proposed plot with your development team and letting agent, and put a fixed-price methodology document on your desk — with the standardised shell, the demising compartmentation, the phased handover programme and the letting-agent coordination all costed in.
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