DOMESTIC ENERGY ASSESSMENT
Building Your Dream Home? Here's why a Domestic Energy Assessor is your secret weapon for smarter, greener new builds
If you're embarking on a new build project—whether it's your forever family home, a self-build dream, or part of a larger development—you know how exciting (and overwhelming) it can be. Amid all the decisions about layouts, finishes, and that perfect kitchen, one thing often gets overlooked until it's too late: energy efficiency compliance. That's where an On Construction Domestic Energy Assessor (OCDEA) come in. Partnering with a qualified OCDEA turns potential headaches into smooth sailing.
The real talk: Why every New Build needs an OCDEA (and why it matters more than ever)
In the UK, no new home can be legally sold, let, or even signed off by building control without an Energy Performance Certificate (EPC)—and that EPC can only come from an accredited OCDEA using the Standard Assessment Procedure (SAP). It's not optional; it's law under Part L of the Building Regulations (Conservation of Fuel and Power).
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But here's the thing: it's not just ticking a box. With the push toward net-zero and the upcoming shifts (like the transition toward the Home Energy Model in late 2026), getting this right early saves money, reduces carbon emissions, and makes your home warmer, cheaper to run, and more appealing to future buyers.
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Many people who ignore early-stage advice can end up ripping out insulation or adding expensive retrofits. Working with PassiHVAC from day one? You will achieve compliance the first time, often with better-than-minimum ratings that add real value to the property.
Our step-by-step guide: How we make the SAP process simple & stress-free
This part is mostly desk-based—no endless site visits disrupting your build schedule. Here's how it typically flows when you work with PassiHVAC.
We start with a friendly chat
We gather the project drawings, specifications, U-values, heating details, and any renewable energy ideas. No site visits needed at this stage.
​​​​The whole process is fast - design-stage reports often in just a few days to a couple of weeks—and we provide clear reports plus extra tips on future-proofing your home.
The most common questions we get asked (and their straightforward answers).
Final thoughts: Let's make your New Build shine
Getting energy compliance right isn't just about following rules—it's about creating a home that's comfortable, affordable to live in, and kind to the planet. In a world where energy costs fluctuate and sustainability matters more than ever, a solid SAP partnership gives you peace of mind and a real edge.
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If you're planning a new build, extension, or development, we'd love to help. Drop us a message for a no-obligation chat or free initial quote—we'll look at your plans and give you honest, straightforward advice.
Your dream home deserves to be efficient from day one. Let's build it right together!