Accurate material bills of quantities, Building Regs Part A-P compliance checks, and trade estimates customized for all 100 major UK cities and local ground conditions.
Calculate cubic metres of concrete, bags of cement, sharp sand, and 20mm ballast for patio and garage slabs.
Launch Calculator →Compute the exact number of standard 215x102.5x65mm UK bricks and sand/cement mortar bags for single and double skin walls.
Launch Calculator →Determine safe joist depth and centres (400mm / 600mm) for domestic suspended timber floor and flat roof spans.
Launch Calculator →Estimate CLS 38x89mm timber studs, noggins, and 12.5mm tapered edge plasterboards needed for internal room dividers.
Launch Calculator →Calculate square metres, box quantities, adhesive buckets, and joint grout weight with cut wastage allowances.
Launch Calculator →Model PV generation based on roof pitch, UK geographic latitude, orientation (South/East/West), and Smart Export Guarantee (SEG).
Launch Calculator →Compare electricity per kWh at COP 3.2 against gas boiler 90% condensing efficiency and calculate annual fuel bill delta.
Launch Calculator →Calculate mineral wool thermal resistance, upgrading from 50mm to recommended 270mm UK Part L standard, and energy savings.
Launch Calculator →Determine Twin & Earth (T&E) copper conductor size (1.5mm² to 16mm²) ensuring voltage drop stays below statutory 3% (lighting) and 5% (power).
Launch Calculator →Verify maximum demand, Type A / Type B 30mA RCD, and 6mm² or 10mm² SWA armoured cable sizing for outdoor wallbox chargers.
Launch Calculator →Compute radiator heat loss for living rooms and bedrooms based on room volume, double glazing, exterior walls, and ΔT50 flow temperatures.
Launch Calculator →Estimate 16mm Pert-Al-Pert pipe coils, 150mm/200mm pipe centres, and loop counts for screed and timber floor overlays.
Launch Calculator →Verify whether single-storey rear extension exceeds 3m (attached) or 4m (detached) or qualifies for 6m/8m Larger Home Extension Scheme.
Launch Calculator →Calculate cubic volume of proposed rear dormer against statutory limits (40m³ for terraced, 50m³ for detached/semi-detached).
Launch Calculator →Calculate exact material cost per gram, electricity consumption, and fail-rate margin for Bambu Lab, Prusa, and Creality prints.
Launch Calculator →Estimate beam kerf width (0.1mm - 0.25mm) for tight interlocking finger joints in 3mm/6mm birch plywood and acrylic.
Launch Calculator →Calculate cubic metres of concrete, bags of cement, sharp sand, and 20mm ballast for patio and garage slabs. Customized for Standard UK Spec with Greater London & South East Climate & Price Index, calibrated for British standard domestic installations and building control approvals.
Launch Calculator →Compute the exact number of standard 215x102.5x65mm UK bricks and sand/cement mortar bags for single and double skin walls. Customized for Heavy Duty Industrial with Greater London & South East Climate & Price Index, engineered for high-load commercial settings and reinforced construction.
Launch Calculator →Every formula and tolerance in DIY 123 UK is calibrated directly against codified British Standards, Eurocodes, and HM Government Approved Documents.
Full alignment with UK Building Regulations including Part A (Structure), Part L (Conservation of fuel and power), and Part P (Electrical safety in dwellings).
Concrete mix proportions, characteristic compressive strength (C20/C25/C30), and sub-base MOT Type 1 compaction ratios certified to European civil standards.
Local depth adjustments for frost penetration, London shrinkable clay subsoils, high water table gravels, and Scottish wind load factors.
Zero tracking of property dimensions or renovation budgets. All structural calculations execute locally inside your browser isolate with sub-millisecond latency.