What is HomeCalc.uk?
HomeCalc.uk is a free collection of home improvement calculators built specifically for UK homeowners. Whether you are planning a new roof, laying a concrete slab, building a garden wall, or sizing a radiator, our tools give you accurate material quantities and cost estimates — fast, with no signup required.
We currently offer eight calculators covering roofing, concrete, bricks and mortar, wall rendering, decking, fencing, radiator BTU sizing, and heat pump grant eligibility. Each tool is designed to answer the questions homeowners actually ask: how much material do I need, what will it cost, and what size or specification should I choose?
Our Mission
Too many homeowners overspend on materials because they are guessing quantities, or they make multiple trips to the builder's merchant because they underestimated. Contractors sometimes inflate material lists because there is no easy way for a homeowner to verify the numbers.
HomeCalc.uk exists to put accurate, independent information into the hands of every UK homeowner — for free. We believe that better information leads to better decisions, less waste, and fairer pricing across the home improvement industry.
Our Values
Accuracy first. Every calculator is built on verified UK standards and real pricing data. We would rather show no result than an inaccurate one.
No barriers. No account creation, no email required, no paywalls. You open the page, enter your measurements, and get your answer.
UK-specific. We do not convert American data and hope for the best. Our material sizes, pricing, building regulations, and terminology are British from the ground up.
Transparency. We explain exactly how each calculation works, what assumptions we make, and where our data comes from. If a number is an estimate, we say so.
How We Calculate
All calculations are based on standard UK building specifications and industry guidelines. Here are some of the key references we use:
Brick and masonry: Standard UK brick dimensions of 215 x 102.5 x 65mm with a 10mm mortar joint, as specified in BS EN 771-1. Mortar quantities follow the ratios recommended in BS EN 998-2 for general-purpose mortar.
Concrete: Slab thicknesses follow NHBC guidance (typically 100mm for domestic paths and patios, 150mm for driveways). We calculate for both 20kg and 25kg pre-mixed bags, covering the most common sizes stocked by UK builders' merchants.
Roofing: Tile coverage rates are based on manufacturer specifications for standard UK interlocking concrete tiles, plain tiles, and natural slate. We include ridge tiles, hip tiles where applicable, and a standard 10% wastage allowance as recommended by roofing trade bodies.
Rendering: Coverage rates for sand/cement, monocouche, and silicone render systems are based on manufacturer data and standard two-coat application thicknesses.
Heating: BTU calculations follow CIBSE (Chartered Institution of Building Services Engineers) guidelines for domestic heating, factoring in room dimensions, insulation quality, window area, and exposure. Heat pump sizing uses data from the Energy Saving Trust and the Microgeneration Certification Scheme (MCS).
Pricing Data
Material prices are reviewed and updated at the start of each calendar year. Our 2026 prices reflect current trade and retail averages from major UK suppliers including Wickes, B&Q, Travis Perkins, Jewson, and Screwfix. Labour rates are based on regional averages published by trade bodies such as the Federation of Master Builders (FMB) and cross-referenced with live quotation data.
We are committed to updating pricing annually so that our estimates remain useful for real project budgeting. If you notice a price that looks out of date, please let us know.
Who Built HomeCalc?
HomeCalc.uk was built by home improvement professionals and web developers who were frustrated by the lack of accurate, UK-specific calculation tools online. Most existing calculators use American measurements, outdated prices, or require you to sign up before showing results. We wanted something better.
Our team has hands-on experience in domestic building projects and a commitment to making specialist knowledge accessible to everyone. We work with tradespeople, quantity surveyors, and material suppliers to ensure our tools reflect how things are actually done on UK building sites.
Industry References
Our calculators are informed by guidance from the following organisations and standards:
NHBC (National House Building Council) -- BS EN 771-1 (clay and calcium silicate masonry units) -- BS EN 998-2 (masonry mortar) -- CIBSE domestic heating guides -- Energy Saving Trust -- Microgeneration Certification Scheme (MCS) -- Federation of Master Builders (FMB) -- UK Building Regulations Part L (conservation of fuel and power).
Contact
Questions, suggestions, or spotted an error in one of our calculators? Get in touch here. We read every message and use your feedback to improve our tools.