Ekotrope CODE: Residential Energy Code Compliance Software
REScheck tells you if you passed. CODE tells you how to pass for less.
Ekotrope CODE is the purpose-built Total UA calculator that shows you every way to hit compliance, so you can swap a window spec, optimize an insulation choice, and still pass. For builders, architects, and engineers.
✓ No credit card required
Trusted by the Energy Rating Industry
2M+ homes rated in Ekotrope
Used by 5,000+ HERS Raters
See every path to compliance. Pick the best one. Compliance optimized for cost, not just code
Every assembly. Every alternative. Every passing margin laid out in one view. Click any cell to swap it in and watch your compliance score recalculate live. Learn how the Trade-off Explorer works here.
Built for the way you actually work.
No spreadsheets. No guesswork. Just the cleanest way to model an envelope, evaluate options, and ship the report.
Instant recalculation
Swap an assembly and watch every cell, score, and pass/fail indicator update in real time.
Clear pass/fail at every step
Green means you're passing. Red means you're not. No interpretation. No surprises at submittal.
Jurisdiction-specific logic
State and local code variants are built in. Pick your jurisdiction; we apply the right rules.
Optimized for cost, not just code
Find the lowest cost compliance package, not the just first one that passes.
Trusted permit reports
Ekotrope permit reports are accepted by code officials for thousands of homes each week.
Always current
Codes change. We track adoptions and amendments and update the rules so you don't have to.
Try it for Free!
Ekotrope Code is free to use — no commitment. Sign up to get your account login to evaluate your building plans and generate your first compliance reports.
Frequently Asked Questions
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Yes. Ekotrope CODE calculates the same Total UA / Total TC pathway that REScheck calculates.
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IECC 2006 through 2024, plus state-specific amendments. Find the full list here (https://www.ekotrope.com/code-official-resources)
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Yes. Ekotrope permit reports are accepted by jurisdictions across the country. Ekotrope reports are used on >400,000 homes annually.
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REScheck supports a limited set of energy codes. Ekotrope CODE supports many more and adds new codes quickly. Ekotrope Code supports innovative tools like the Tradeoff Explorer.
Ekotrope CODE resources
Getting started with Ekotrope CODE
A complete walkthrough of Ekotrope CODE, our Total UA calculator for the IECC compliance path. Covers how to open the tool, enter project information and envelope components, read your results, explore tradeoffs, and download a PDF report.
Understanding UA compliance
Explains the building science behind the Total UA compliance path. Covers how UA is calculated, what the proposed vs. budget comparison means, and when to use this path vs. other IECC options. Read this when you want to understand the why behind the numbers.
Trade-off explorer
A grid at the bottom of every project showing alternative values for each component type — walls, glazing, roofs, slabs, and more. Select any combination to instantly see how swapping one component affects your overall UA and whether the home still passes.
More resources
Project information Building envelope components