A 6,200m² speculative steel-portal-frame distribution warehouse on the M62/M1 corridor in West Yorkshire — 142 CFA piles to 14m, RC ground beams, FM2 power-floated racking-ready slab, 6 dock-level bays with Hormann levellers and shelters, 320m² mezzanine office with curtain-wall glazing, high-bay LED lighting on a daylight-sensor system, and a 4,800m² HGV-rated yard with palisade fencing, ANPR-ready gatehouse and cellular SuDS attenuation. Twelve-month programme delivered against fixed price; a 3PL tenant signed in month seven and dovetailed into the final two months without disturbing the developer's base contract. BREEAM Very Good achieved at 53.4%.
A regional commercial property developer with a long track record of speculative industrial schemes commissioned a 6,200m² mid-box distribution warehouse on a 1.6-hectare site adjacent to the M62/M1 corridor in Wakefield. The site is one of the prime UK distribution geographies — equidistant between Leeds, Sheffield and Manchester with motorway access in three directions — and the developer had pre-let interest from two parties at planning stage. The brief was a 3PL-ready specification: FM2 floor flatness for narrow-aisle racking, six dock-level bays sized for full-articulated HGVs, a 320m² mezzanine office with curtain-wall glazing, and a yard configured for an articulated swept-path with secondary trailer parking. Twelve-month programme, fixed-price contract, with the developer holding the construction risk and the tenant fit-out scoped as a separate package outside our contract.
We were appointed via two-stage tender against three other contractors. Our bid came in second on stage-one fees by approximately £42,000 against the leading offer. We were appointed for stage two because our methodology document was the only one to (a) cost the Section 278 highway works, the planning conditions discharge schedule and the build-over agreement with Yorkshire Water inside the contract sum rather than as provisional sums, (b) commit to a 14-day weather contingency on the steel erection programme rather than treating an October-March erection window as a free programme variable, and (c) specify the FM2 floor flatness as a contractual deliverable to be tested independently to TR34 with a Walking Floor Profileograph rather than as a "best endeavours" line in the slab specification.
A 3PL tenant on a fifteen-year lease signed in month seven of the build, with vacant-possession occupancy required at the contracted practical completion date. Tenant-specific changes — eight additional ANPR cameras at the yard perimeter, three brand signage frames on the elevation, an upgrade from a standard wet-pipe sprinkler system to ESFR for the tenant's storage class — were handled via a separate tenant-funded works package agreed in month eight, dovetailed into the final two months of our programme without disturbing the developer's fixed-price base contract. Practical completion was certified on the contracted date. The tenant took occupancy two weeks later after their racking installer had loaded the building.
The brief came from the developer's Construction Director, the developer's quantity surveyor and a retained warehouse specialist consultant jointly. Priorities, in their stated order:
A speculative 6,200m² distribution warehouse on a 12-month programme is a coordinated set of trades stacked on a critical path that runs through groundworks, steel erection and slab pour. Every constraint had a workaround that had to be planned before the topsoil came off.
The site investigation report logged 3-4m of soft alluvium overlying a competent sandstone bearing stratum — typical of the M1 corridor and not viable for pad foundations under a steel portal frame of this span. We took the SI report into the bid and priced a CFA piling solution: 142 piles at 450mm diameter, 14m deep, with reinforced concrete ground beams tying the pile heads. Piling sub-contracted on a fixed price within our contract sum. Independent pile integrity testing on a 10% representative sample at month 3: all 14 piles within tolerance, no defects logged.
The new vehicle access required a Section 278 agreement with the local highway authority for a new bell-mouth junction off the local distributor road, including a deceleration lane, dropped kerbs, footway diversion and updated highway lighting. We engaged the highway authority pre-bid, agreed the design and approved-list contractor pre-start, and held the S278 works as a parallel sub-contract with their own programme dovetailed against our yard programme. S278 completion certified in month 9, well ahead of practical completion.
Steel erection landed on the autumn-winter window. Yorkshire steel erection in November-February carries genuine weather risk: high winds for crane lifts, frozen concrete in pad bases, lost shifts. We costed a 14-day weather contingency into the steel erection programme at bid stage and held those days as float in the master programme rather than treating them as a free variable. Six lost shifts were absorbed into the contingency without consuming any programme float on the critical path. Steel-up complete in month 4 against the contracted month-4 date.
The floor flatness specification was the most demanding line in the contract. FM2 to TR34 fourth-edition is the standard 3PL racking floor: 95% of the FF (overall flatness) and FL (overall levelness) measurements within the published tolerance bands, no individual reading outside the maximum. We specified a single-pour strategy with laser screed across the full 6,200m², supplemented by power-trowelling at 6, 12 and 18 hours post-pour. Independent floor flatness testing in month 7 by a UKAS-accredited floor specialist using a Walking Floor Profileograph: 17 of 17 panels passed first-time, mean FF 38.2 against a target FF 35.
The yard layout had to accommodate 16.5m articulated HGVs reversing onto six dock bays in sequence with a separate trailer parking strip. We commissioned a full swept-path analysis at design stage using AutoTrack software, tested with a 16.5m articulated unit at the developer's existing nearby site for ground-truth, and set the dock approach concrete pads, kerbs and fence lines off that swept envelope. Dock equipment specified to Hormann HLT 2-50 hydraulic levellers with three-sided telescopic dock shelters, knee bumpers, dock lights and tenant-ready dock-lock provision. Dock equipment commissioned in month 11.
The 3PL tenant signed in month 7. Their fit-out specialist requested three changes outside the developer's base contract: eight additional ANPR cameras at the yard perimeter, three brand-signage frames on the western elevation, and an upgrade from the contracted wet-pipe sprinkler system to ESFR for their storage class. We agreed a separate tenant-funded works package in month 8, sub-contracted the additional sprinkler density and cameras, and dovetailed them into months 11 and 12 of our base programme. The developer's fixed-price base contract was unaffected; the tenant's variation order ran on a separate sheet of paper.
Industrial new-builds at this scale succeed or fail on the discipline of the early-stage workstreams — the SI report, the planning conditions discharge, the S278, the piling design — long before the steel erector mobilises. Our approach was built around four governance disciplines and one technical discipline.
Pre-start workstreams resolved before mobilisation. The two competing tenders treated the pre-commencement planning conditions, the Section 278 highway works and the Yorkshire Water build-over agreement as items that the developer would resolve in parallel with the early build. We treated them as gating items: every condition discharged in writing before mobilisation, S278 design approved on the highway authority's approved-contractor list before week one, build-over agreement countersigned month one. Zero condition-related programme delays across the full twelve months.
SI-driven foundation design, priced fixed. The site investigation report had been issued to all tenderers; the two competing bids priced pad-foundation alternatives subject to a "soft ground allowance" line. We took the SI at face value, designed CFA piles to the bearing stratum on stage-one fees, and priced the piling sub-contract as a fixed price within our contract sum. The developer's quantity surveyor confirmed in their stage-two appointment letter that this was the single largest reason we were appointed: foundation cost certainty on a soft-ground site.
Steel erection treated as a weather-exposed workstream. The contracted erection window landed October-March. Yorkshire steel erection in those months loses shifts to high winds and frozen pad bases as a routine fact of life. We costed 14 calendar days of weather contingency into the master programme at bid stage and held those days as float on the critical path, not as a hopeful overrun. Six shifts lost across November-January, all absorbed into the contingency, steel-up complete on the contracted month-4 milestone with no extension of time requested.
FM2 floor flatness owned by a single sub-contractor on a single pour. Multi-pour large industrial slabs are a standard cost-saving on FM2 spec but introduce panel-edge tolerance failures that show up in the third-party flatness test as the hardest single thing to remedy after handover. We specified a single laser-screeded pour for the full 6,200m² on a single shift, with the slab sub-contractor on a fixed-price contract that included the third-party flatness test as a contractual hold-point. 17 of 17 panels passed first-time. Mean FF 38.2 against a target FF 35; mean FL 28.4 against a target FL 25.
Two hundred and fifty working days from possession of site to practical completion. A civils-led mobilisation, a steel-up sequenced against weather contingency, a single-pour slab, and a tenant fit-out interface dovetailed into the final two months without disturbing the base contract.
Site possession, welfare cabin compound and material storage area established on the eastern boundary. All pre-commencement planning conditions discharged in writing in the first three weeks: ecology survey sign-off, archaeology watching brief commencement, surface water drainage strategy approval, contamination-by-exception report submitted and accepted. Section 278 highway works agreement countersigned. Build-over agreement with Yorkshire Water countersigned. CDM Principal Contractor handover, F10 notification submitted. Existing site clearance and topsoil strip across the 1.6-hectare site.
Bulk earthworks: 11,400m³ of cut-and-fill across the platform with surplus material exported under hazardous-waste tracking where contamination thresholds applied. Foul and surface water drainage to the boundary: 380m of foul to the public sewer connection, 470m of surface water to the cellular attenuation tank position. Cellular attenuation tank installed under the future yard footprint with concrete protection slab over. Oil interceptor installed on the yard drainage outfall. Wildflower bund along the western boundary completed and seeded as the biodiversity net gain measure.
CFA piling sub-contractor mobilised week one of month three. 142 piles at 450mm diameter to 14m depth into the sandstone bearing stratum, completed across 18 working days. Independent pile integrity testing on 14 piles (10% sample) by a UKAS-accredited test house: all 14 within tolerance, no defects. Reinforced concrete ground beams cast on the pile heads to tie the foundation grid for the portal frame bases. Ground-floor sub-base laid and compacted. Service ducting through the slab subgrade for incoming utilities, dock-area drains and tenant-flexible cable routes.
Steel sub-contractor mobilised on a fixed sequence: 23 single-span 28m portal frames at 7m centres, gable-end frames, eaves beams, secondary purlins on 1.65m centres, gable-frame and longitudinal bracing, mezzanine support steel. 14 calendar days of weather contingency held in the master programme; six shifts lost across November to high winds and one frozen-base morning, all absorbed without consuming critical-path float. Steel-up complete on the contracted month-4 milestone. Independent steelwork inspection by a third-party engineer pre-cladding: zero non-conformances logged.
Composite roofing system installed: 120mm PIR-cored composite panels on standing-seam profile, 10% rooflight area in twin-skin GRP rooflights, smoke vents to the fire strategy, full thermal performance to current Part L. Wall cladding: 100mm PIR-cored insulated composite panels, full envelope air-tightness detailing. Roller-shutter and personnel door openings formed. Building weather-tight by end of month five — the master-programme weather-tight milestone. Internal trades onto first-fix from the start of month six.
The critical pour. Single laser-screeded ground-bearing slab across the full 6,200m², 175mm thickness on a 1200-gauge polythene damp-proof membrane on a 50mm sand blinding on the compacted Type-1 sub-base. Power-trowelling sequenced at 6, 12 and 18 hours post-pour with three trowel rigs working in parallel from the four corners. Curing under a polythene membrane for 7 days. Saw-cut control joints installed at 7 days. Single-pour strategy on a single 14-hour shift with three concrete pumps and a continuous truck-line through the access road.
Independent floor flatness test in week one of month seven by a UKAS-accredited floor specialist using a Walking Floor Profileograph: 17 of 17 panels passed first-time at TR34 fourth-edition FM2 specification, mean FF 38.2 against target FF 35, mean FL 28.4 against target FL 25. FM2 certification report bound and delivered to the developer. Mezzanine office construction: steel deck floor, 320m² office shell, partition framing, first-fix M&E. 3PL tenant lease signed during week three of month seven; tenant-fit-out specialist mobilised in week four for cabling and ANPR survey.
Warehouse M&E first-fix: incoming three-phase supply terminated, distribution boards set, busbar rising main run, high-bay LED lighting cable runs and daylight-sensor wiring. Mezzanine office M&E first-fix: small power, lighting, comms cabling, comfort cooling pre-installation. Rooflight smoke vents installed and motorised. Tenant-funded works package agreed in writing in month eight: ESFR sprinkler upgrade in lieu of the contracted wet-pipe system, eight additional ANPR cameras, three brand signage frames. Sub-contracted on separate fixed prices, dovetailed into months 11-12.
Section 278 highway works completed: bell-mouth junction off the local distributor road, deceleration lane, dropped kerbs, footway diversion, updated highway lighting. Section 278 completion certificate issued by the highway authority. Yard sub-base: fully-bound stone base course laid across 4,800m², with concrete-paved dock approach and turning-circle areas formed in advance of the asphalt overlay. Mezzanine office curtain-wall glazing installed on the elevation facing the warehouse floor and on the outer elevation, integrated with the cladding.
Yard heavy-duty asphalt overlay laid across the 4,800m² in two passes, line-marked for HGV swept paths, dock approaches, trailer parking and the car park. Palisade fencing erected on the perimeter, sliding access gate hung, ANPR-ready gatehouse pod set in position with cabling pre-installed. Warehouse M&E second-fix: high-bay LED light fittings hung, daylight-sensor system commissioned in test mode, distribution boards energised. Mezzanine office second-fix: switchplates, sockets, light fittings, comms patch panels.
Dock equipment installed across all six bays: Hormann HLT 2-50 hydraulic dock levellers, three-sided telescopic dock shelters, knee bumpers, dock lights, tenant-ready dock-lock provision. ESFR sprinkler system installed in lieu of the original wet-pipe specification per the tenant-funded variation. ESFR commissioning by the sprinkler sub-contractor's specialist team, FM Global witness test on Wednesday of week three of month eleven, full system pass certificate issued. Tenant ANPR cameras installed at the eight additional perimeter positions. Snag round one walkthrough end of month eleven.
Final snag round in week one of month twelve: 47 items closed by end of week two. Air-permeability test on the envelope: result 4.8 m³/(h.m²) at 50Pa against a contracted target of less than 5.0. BREEAM assessment by the developer's appointed BRE assessor in week three: 53.4% scoring achieved against a contracted target of 50% (Very Good). Practical completion certificate issued on the contracted date. Full O&M manuals, certification reports, BREEAM report, FM2 floor test report, S278 completion certificate, F-Gas certificates and warranty package handed over to the developer. Tenant occupancy two weeks later after racking installation.
The technical detail behind a 6,200m² speculative distribution warehouse built to a 3PL-ready specification with FM2 floor flatness, BREEAM Very Good and a tenant-fit-out interface dovetailed into the final two months.
142 continuous flight auger piles at 450mm diameter to 14m depth into the sandstone bearing stratum, with reinforced concrete ground beams tying the pile heads. Independent pile integrity testing on a 10% representative sample (14 piles): all within tolerance. Foundation cost certainty achieved at fixed price within contract sum.
175mm thickness ground-bearing slab on 1200-gauge DPM on 50mm sand blinding on compacted Type-1 sub-base. Single laser-screeded pour across the full 6,200m² on a 14-hour shift. Power-trowelling at 6, 12 and 18 hours post-pour. Independent UKAS-accredited test to TR34 fourth-edition: 17/17 panels first-time pass, mean FF 38.2 vs FF 35 target.
23 single-span 28m portal frames at 7m centres, 12.5m haunch height, 15m to apex. Secondary purlins on 1.65m centres. Gable-end frames, eaves beams, longitudinal and gable-frame bracing to current Eurocode wind loadings. Mezzanine support steel integrated. All steelwork to BS EN 1090 execution class EXC2, fully galvanised at exposed-condition members.
Walls: 100mm PIR-cored insulated composite panels, full air-tightness detailing, RAL-7016 anthracite finish to elevation specification. Roof: 120mm PIR-cored composite roofing system on standing-seam profile, 10% rooflight area in twin-skin GRP rooflights, motorised smoke vents to fire strategy. Air-permeability test result: 4.8 m³/(h.m²) at 50Pa against target less than 5.0.
Hormann HLT 2-50 hydraulic dock levellers (2,000mm operating range, 50kN load capacity), three-sided telescopic dock shelters with full perimeter seal, knee bumpers, dock lights, tenant-ready dock-lock provision. 1.2m dock height. Concrete-paved dock approaches sized for 16.5m articulated HGV swept path verified by AutoTrack analysis.
Steel-deck mezzanine floor supported off the portal frame, 320m² on a single level. Curtain-wall glazing on the elevation facing the warehouse floor (line-of-sight management visibility) and external curtain-wall glazing on the outer elevation for daylight. Cassette comfort cooling, comms cabling for 24 desk positions, lift-and-stair access pre-prepared for tenant fit-out specification.
High-bay LED fittings throughout the warehouse on a daylight-sensor control system tied to the rooflights, with motion-activated zones in lower-traffic aisles. Target lux of 200 at floor level under full operation, dimmed to 100 lux daylight-augmented mode. Mezzanine office lighting: Cat-A daylight-linked system, dimmable LED panels.
Original wet-pipe sprinkler system upgraded to ESFR (Early Suppression Fast Response) in lieu of contracted spec, per tenant-funded variation. ESFR designed for the tenant's storage class and rack-aisle configuration. FM Global witness test passed first-time. Smoke detection and alarm to BS 5839 Part 1 Category L1, motorised roof smoke vents, dry-riser-equivalent for fire and rescue access.
Cellular attenuation tank under the yard sized to the discharge consent agreed with Yorkshire Water. Oil interceptor on the yard drainage outfall. Foul drainage 380m to public sewer connection. Surface water drainage 470m to attenuation tank. Build-over agreement with Yorkshire Water countersigned month one and complied with throughout.
4,800m² HGV-rated yard surfacing: heavy-duty asphalt overlay on a fully-bound base course, with concrete-paved dock approaches and turning circles. Palisade-fenced perimeter (2.4m height) with anti-climb topping. Sliding access gate, ANPR-ready gatehouse pod, CCTV mast-points pre-cabled, eight perimeter ANPR cameras installed under tenant-funded variation.
BREEAM Very Good achieved at 53.4% scoring against contracted 50% target. PV-ready roof structure (panel weights and electrical infrastructure provisioned for future tenant install), eight EV charging points in the car park, daylight sensors throughout, wildflower bund on the western boundary as biodiversity net gain. Air-permeability 4.8 m³/(h.m²).
Section 278 highway works completed: bell-mouth junction, deceleration lane, dropped kerbs, footway diversion, updated highway lighting. All pre-commencement and pre-occupation planning conditions discharged in writing. Build-over agreement with Yorkshire Water countersigned. Discharge of conditions binder delivered to the developer at handover.
A 6,200m² speculative distribution warehouse on the M62/M1 corridor delivered against a 12-month fixed-price contract with no developer variation orders, the steel-up milestone hit on the contracted month-4 date, every one of 17 FM2 floor flatness panels passing first-time, every one of 14 pile integrity tests within tolerance, the BREEAM Very Good target exceeded at 53.4%, the S278 highway works completed a full month ahead of programme, and zero RIDDOR-reportable accidents across 138,000 contract hours. Practical completion was certified on the contracted date. The 3PL tenant took occupancy two weeks later after their racking installer had loaded the building.
The 3PL tenant signed in month seven and asked for three changes outside the developer's contract: an ESFR sprinkler upgrade for their storage class, eight additional perimeter ANPR cameras and three brand signage frames on the elevation. We agreed a separate tenant-funded works package in month eight, sub-contracted the additional packages, and dovetailed them into months 11 and 12 of the base programme. The developer's fixed-price contract was unaffected; the tenant moved in to a building configured for them. The Canary Wharf HQ Fit-Out we delivered earlier in the year was an 11-week regulated tower fit-out for a financial services tenant; the Birmingham Colmore Row HQ was an 8-week heritage Cat-B inside a Grade II shell. This was the same methodology applied to a 12-month industrial new-build for a developer who needed cost certainty on a soft-ground site and a tenant who needed FM2 floor flatness on day one of trading.
We are a regional commercial property developer with twenty years of speculative industrial schemes behind us, and our quantity surveyor has worked with most of the contractors operating in the Yorkshire industrial market. We tendered four contractors on this Wakefield scheme. Building Group came in second on stage-one fees by forty-two thousand pounds. We appointed them for stage two because their methodology document was the only one to price the Section 278 highway works, the planning conditions discharge and the build-over agreement inside the contract sum, the only one to commit to a fourteen-day weather contingency on the steel erection programme rather than treating an October-March window as a free variable, and the only one to specify the FM2 floor flatness as a contractual deliverable to be tested independently to TR34 with a Walking Floor Profileograph. The cheaper bids would have hit us with all three of those as variations within the first six months. Twelve months later we had a building with seventeen of seventeen floor flatness panels first-time pass, BREEAM Very Good at fifty-three point four per cent, the steel up on the contracted date, and zero variation orders raised against the developer contract. The tenant signed in month seven, asked for three changes outside our contract, and Building Group ran those as a separate tenant-funded works package without disturbing our base programme by a single day. We have already appointed them on a second scheme.
If you're a developer with land under option, an investor with a planning consent in hand, or an owner-occupier needing a 3PL-ready spec, we'll come out for a free site visit, walk the SI report and the planning consent with your construction director, quantity surveyor and warehouse consultant, and put a fixed-price methodology document on your desk — with the foundation design, the FM2 slab specification, the dock equipment, the yard works, the S278 highway agreement and the BREEAM scoring strategy all costed in.
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