Free Building Regulations tools & calculators.
Straightforward calculators and guidance tools designed to help homeowners, designers, builders and assessors understand common Building Regulations requirements before progressing to a full technical assessment.
Start with the question you need answered
The toolkit will grow over time, with each tool designed to answer a specific question without overwhelming users with unnecessary technical detail.
Not sure which Building Regulations services you need?
Answer a series of straightforward questions about your building and proposed work. The service finder will then provide an initial list of the calculations, assessments, certificates and tests your project may require.
Complete the short guided questionnaire and receive a tailored list of the services that may be relevant.
Start the service finder →Building Regulations & Future Homes Checker
Check which Part L, Part F, Part O and energy-assessment package is likely to apply using the Building Control submission and individual-building commencement dates.
Part O Overheating Route Finder
Answer a short series of questions to see whether the Part O simplified method appears possible or whether a TM59 assessment is likely to be the appropriate route.
Excess Glazing Calculator
Check whether the proposed windows, doors, rooflights and roof lanterns in a domestic extension are likely to exceed the normal Part L glazing allowance.
P/A Ratio Calculator
Calculate a floor’s exposed perimeter-to-area ratio for use when determining ground-floor thermal performance and U-values.
Roof Pitch Calculator
Convert roof rise and run measurements into pitch angles, gradients and useful dimensions for early design checks.
U-value Calculator
Produce an initial estimate of heat loss through a wall, floor or roof using the thickness and thermal conductivity of each construction layer.
Floor Area Calculator
Calculate the area of simple or combined room shapes and produce a clear total for quotations, assessments and project planning.
Ventilation Calculator
Carry out an initial check of common extract, whole-dwelling and background ventilation requirements for domestic projects.
Need a formal calculation or Building Regulations report?
Online tools are useful for initial checks, but some projects require a formal assessment prepared by a qualified assessor. Contact Barlings KWA for practical advice and a fixed quotation.
For a formal report, explore our SAP calculations for homes, SBEM calculations and BRUKL reports for commercial buildings, or Part O and TM59 overheating assessments. We review the drawings and your submission requirements before confirming the assessment scope.