Ductwork, Refrigerant & Air Systems · NRM2 Section 38 (Ventilation & Comfort Cooling)

UK HVAC & Ventilation Estimating: Ductwork, VRF/VRV, MVHR & Air Handling

Complete HVAC measurement translating ventilation plans into DW144 rectangular/circular ductwork gauges, bends, attenuators, VRF copper refrigerant runs, MVHR boxes, and grilles.

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How is hvac & ventilation measured under RICS NRM2?

Ductwork and VRF contractors need clear visibility across duct dimensions, DW144 pressure classes, plenum boxes, smoke/fire dampers, and insulated refrigerant pairs. Our estimators break every air path from AHU intake louvre to room diffuser.

  • Converts rectangular duct widths/heights cleanly into sheet-metal surface area (m2) alongside linear metres for DW144 pricing.
  • Captures fire-rated ductwork sections, intumescent compartment dampers, and Part O / overheating cooling plant cleanly.

Which deliverables and drawings are involved?

  • Galvanised/rectangular & spiral duct takeoff (m/m2)
  • Dampers (VCD/fire/smoke), attenuators & grilles count
  • VRF/VRV refrigerant twin-pipe, condensate & FCU schedule

Drawings & Inputs Accepted

  • Ventilation & air-conditioning floor layouts
  • Ductwork sizing, damper & grille schedules
  • VRF branch selector & refrigerant schematics

Measurement & Deliverable Parameters

How are UK hvac & ventilation takeoffs structured for tender accuracy?

HVAC Estimating — UK Measurement Units, Deliverables & Workflow Specification
Estimating ParameterTechnical SpecificationStandard / Audit Basis
Work Breakdown & UnitsNRM2 Section 38 (Ventilation & Comfort Cooling) in m, m2, nrScaled PDF / DWG plans at 1:50 & 1:100 (dimensions in mm / m)
Waste & Prelim SeparationNet physical takeoff plus 5%–10% typical trade waste splitKeeps net order counts transparent for merchant tenders
Deliverable Workbook100% unlocked formula Excel + colour-coded PDF overlaysIncludes formal RFI log flagging drawing ambiguities
Turnaround & File Transfer24–48 hrs (domestic/single trade) · up to 25 MB uploads3–5 working days typical for multi-trade commercial tenders

Calibration note: 1:50 and 1:100 architectural and structural drawings are scaled to 25 mm masonry tolerances and 100 mm thermal zones, isolating 5 percent to 10 percent wastage from net quantities.

Where is hvac estimating typically applied across UK projects?

Commercial office VRF & FCU fit-outsResidential MVHR Part F/O apartment packagesKitchen extract & commercial make-up AHUsHealthcare clean/negative-pressure suites

Targeted UK Coverage

HVAC Estimating by UK City, County & Postcode District

Major Cities

HVAC & Ventilation in OxfordHVAC & Ventilation in CambridgeHVAC & Ventilation in Reading

Counties

CheshireOxfordshireCambridgeshire

Commercial Postcodes

EC1E14LS1

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HVAC Estimating FAQs

Do ductwork takeoffs measure fittings/bends/reducers or linear metres with fitting factors?

Either format—we provide exact linear lengths per duct dimension plus surface area (m2) and counted transitions, plenums, bends, and attenuators.

Can you price residential MVHR semi-rigid radial ducting separately from rigid galvanised?

Yes. MVHR manifolds, radial 75mm pipe coils, roof cowls, and acoustic attenuators are scheduled specifically for Part F housing packages.

Do VRF packages include BS EN 378 refrigerant leak detection and condensate pumps?

Yes—refrigerant leak detectors in sleeping/hotel zones, BS boxes, and gravity/pumped condensate lines are quantified.

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