Table of Contents
Electrical Takeoff Checklist (UK)
A Consultant-Grade Technical Framework for Accurate Electrical Estimating
By Fusion Assist | Accurate Construction Estimates. Fast Turnaround. Real Results.
Introduction
Electrical estimating forms one of the most technically sensitive components of a construction project in the UK. Incorrect electrical takeoffs can cause:
- Overloaded circuits
- Non-compliant cable sizing
- Programme delays
- Fire safety failures
- Inaccurate BOQs
- Cost overruns
- Procurement delays
A well-structured Electrical Takeoff Checklist ensures all quantities, system components, cable routes, containment, protective devices, and design requirements are captured correctly—following BS 7671, BS 5839, BS 5266, and coordination under RIBA Stages 2–4.
This document presents a full consultant-grade checklist used by electrical estimators, QS teams, and MEP coordinators in the UK.
Pre-Takeoff Preparation
Before beginning the takeoff, verify:
Drawing Packages
Ensure the following drawings are present and latest-revision:
- Electrical General Arrangement (GA) Plans
- Lighting Layouts
- Small Power Layouts
- Fire Alarm Layouts
- CCTV / Access Control Layouts
- Containment Layouts
- Risers & Distribution Schematics
- Cable Routing Drawings
- Switchroom / LV Room Layouts
- MEP Coordination Layouts
- Revit/BIM model (if available)
Drawing Verification
Check:
- Revision status
- Title block completeness
- Scale accuracy
- Notes & legends
- Symbol key
- Grid lines & floor levels
- Cross-references to mechanical drawings
- Location plan
Specification Documents
Retrieve and study:
- Employer’s Requirements (ERs)
- Performance specification
- Electrical specification
- Fire strategy
- Schedule of rates
- Design criteria (lux levels, diversity, protection type, cable grouping derating)
Core Electrical Takeoff Checklist
Below is the consultant-grade detailed checklist.
Cable Takeoff
For ALL cable types, record:
Cable Identification
- Circuit reference
- Feed direction (DB-to-load or load-to-DB)
- Cable type (LSF/LSZH, SWA, FP200, NYY-J, Cat6A, fibre)
- Number of cores
- CSA size (mm²)
- Voltage rating
- Protective conductor type
- Screening/shielding requirements
Cable Length
Measure:
- Horizontal runs
- Vertical risers
- Drops to devices
- Routing around obstacles
- Allowances for slack
- Containment offsets
- Spares (typically 10%)
Derating Factors
Apply:
- Grouping factor
- Thermal insulation factor
- Ambient temperature factor
- Installation method factor
- Voltage drop limits under BS 7671
Cable Protection
Count:
- Grommets
- Fire stopping seals
- Cable glands (BW, CW, A2)
- Cable lugs
- Ident tags
Containment Takeoff
Cable Tray
- Width (100mm/150mm/300mm etc.)
- Thickness
- Straight runs
- Risers
- Dropper sections
- 90° bends
- Tees, reducers
- Supports (rod hangers, brackets)
- Accessories (fishplates, bolts, couplers)
Trunking
- Size (50×50, 100×50, 150×100 etc.)
- Multi-compartment requirements
- Lids, corners, tees
- Fire barrier points
Conduit
- PVC conduit (20mm/25mm/32mm)
- Steel conduit
- Bends, elbows, couplings
- Junction boxes
- Saddles & fixings
Cable Basket
- Width
- Depth
- Structural supports
- Accessories
Lighting Systems
Light Fittings
For EACH luminaire:
- Fitting type (LED panel, downlight, batten, emergency)
- Wattage
- Control gear type
- Mounting type (surface/recessed/suspended)
- IP rating
- UGR requirement
- CCT (4000K etc.)
Emergency Lighting
Record:
- Maintained / Non-maintained
- Self-test or central battery
- Escape route fittings
- Exit signs
- Conversion kits
Lighting Controls
Count:
- PIR sensors
- Microwave sensors
- DALI modules
- Switches
- Daylight harvesting sensors
- Control panels
Small Power Takeoff
Devices
Count:
- 13A twin sockets (switched/unswitched)
- USB sockets
- Spur outlets
- Fused connection units
- Floor boxes
- Waterproof sockets
Specialised Outlets
- Cooker outlets
- Appliance isolators
- Underfloor heating controllers
- Server racks
- Industrial sockets (16A/32A/63A)
Distribution Boards & LV Equipment
Distribution Boards
Record:
- DB type (TP&N or SP&N)
- Incomer type
- Ways required
- Diversity calculation
- Schedule of devices
- DP isolation
Switchgear
- LV panels
- MCCBs
- ACBs
- Automatic Transfer Switches (ATS)
- Metering requirements
- Cable entry locations
Fire Alarm System (BS 5839)
Devices
Count:
- Smoke detectors
- Heat detectors
- Beam detectors
- Manual call points
- Sounders
- VADs
- Interface modules
Panels & Control
- Fire Alarm Control Panel
- Repeater panels
- Loop cards
- Power supplies
Cabling
- FP200/Enhanced cable routing
- Segregation from LV cables
- Riser routes
Emergency & Life Safety Systems
- Escape guidance
- Disabled refuge points
- AOV (Automatic Opening Vent) controls
- Fire fighters’ telephones
- Sprinkler valve monitoring
Structured Cabling (Cat6A/Fibre)
- Data outlets
- Patch panels
- Cat6A runs
- Fibre backbone
- Server cabinets
- WiFi access points
- Cable management
Earthing & Bonding
- Earth bars
- Main Earth Terminal
- Sub-main bonding
- Local supplementary bonding
- Lightning protection interfaces
Testing, Commissioning & Certification
Record allowances for:
- Dead testing
- Live testing
- Functional testing
- Emergency lighting testing
- Fire alarm cause & effect testing
- BS 7671 certification
- O&M integration
Coordination Requirements
Electrical takeoffs must reference:
- Mechanical equipment schedules
- Door hardware access control sets
- Ceiling coordination drawings
- Builder’s work drawings
- Acoustic requirements
- Structural openings
- Riser capacity checks
People Also Ask?
- Which UK standard governs electrical design?
BS 7671 (IET Wiring Regulations). - Which fire alarm standard applies?
BS 5839 for design, installation, commissioning, and maintenance. - What software is used for electrical takeoff?
Bluebeam, PlanSwift, Countfire, Trimble Estimation, or Revit for BIM. - When should electrical takeoff occur?
RIBA Stage 3 for initial costing; detailed takeoff at Stage 4. - What is the biggest risk in electrical takeoff?
Incorrect circuit lengths, incorrect cable sizing, and missing containment quantities.