BRS Technology: Building Regulations Solutions Get in touch

Building Regulations software for the construction industry

We build thermal modelling tools, U-value calculators and site compliance apps that help manufacturers, housebuilders and assessors meet the Building Regulations with confidence.

Explore AutoPSISee our projects
Colour temperature map of heat flowing through a cavity wall and ground-floor junction, warm inside and cold outside, with isotherm lines bending around the junction Outside 0 °CInside 20 °C
A 2D heat-flow model of a cavity wall meeting a ground-bearing floor. Each line is 1 °C. Where the lines crowd together, heat is escaping — that's the thermal bridge a PSI value measures.
Software partner toKnauf InsulationGalaxy Insulationand the teams using AutoPSI across the UK

What we build

Every product starts from the regulations: what has to be calculated, evidenced or checked — then we make that the quickest part of the job.

Thermal modelling

AutoPSI calculates PSI values for SAP assessments and fRsi values for retrofit in minutes, replacing pessimistic defaults with modelled figures.

About AutoPSI

Online calculators

Branded U-value calculators that let specifiers check a build-up against Building Regulations targets, built and maintained with insulation manufacturers.

Knauf project

Compliance apps

Mobile tools for collecting the photographic evidence Part L now requires on site, organised so it drops straight into the BREL report.

Galaxy project

AutoPSI: bespoke PSI values in minutes

Since Part L 2021 withdrew Accredited Construction Details, a junction without its own PSI value falls back to a default that is often far worse than the real detail. That gap costs money elsewhere in the specification.

AutoPSI is our online thermal modelling tool for construction junctions. Drag in the layers, place the bridges, and get a PSI value you can use in SAP — without a specialist modelling package.

  • FastModel a junction and get its PSI value in minutes.
  • Easy to useDrag and drop layers and bridging elements.
  • CustomisableBuild bespoke junctions, not just library details.
  • AccurateSelf-accredited for 2D calculations to BR 497 conventions.
  • OnlineNothing to install; work from anywhere.
  • ShareableSend models to the rest of the design team.
Try AutoPSI freeHow AutoPSI works

Who uses AutoPSI

  • Housebuilders
  • Architects
  • SAP assessors
  • Retrofit assessors and coordinators
  • Construction product manufacturers

Recent projects

Long-running partnerships with manufacturers who needed regulation-aware software their customers would actually use.

Sketch of a U-value calculator: a wall build-up of layers beside a result checked against a target Example wall build-up OutsideInside Facing brickResidual cavityInsulation boardBlockworkPlasterboard Calculated U-value 0.18 W/m²K Meets target

Knauf Insulation

U-value calculator

We have worked with Knauf Insulation for a number of years, developing their U-value calculator together so specifiers can check build-ups against the regulations in a few clicks.

Read about the calculator
Sketch of a phone app collecting site photos for each construction detail, with completed items ticked Plot 14 · photo evidence Ground floor junction Wall insulation Eaves junction Window reveals Photos taggedto each detailReady for theBREL report

Galaxy Insulation

GTS app for BREL photo evidence

We partnered with Galaxy Insulation to build the GTS app, which captures the Part L photographic evidence needed for each home and keeps it ready for the BREL report.

Read about the GTS app

Regulation specialists and software engineers, in one team

Regulations first

We know the Approved Documents and the conventions behind them, so the software gets the compliance logic right from day one.

Built with you

We develop alongside our clients, shaping each product around how their teams and customers really work.

Kept current

Standards change. We track every update so the tools your customers rely on stay compliant.

Got a compliance process that should be software?

Tell us what your team calculates, checks or evidences today. We'll tell you how we'd build it.

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