A Passivhaus home is one of the most comfortable homes you can live in. Warm without effort. Fresh air without opening a window. Energy bills a fraction of what you'd expect. Not because of expensive gadgets, because the home itself is built to work harder from the ground up. Every G2 Passivhaus project is delivered to the standard, not as an approximation of it.
What We Deliver:
Up to 90% lower heating bills — built into the fabric of the home
Consistent warmth throughout — no cold spots, no draughts, no surprises
Fresh, filtered air in every room — quietly, continuously, without you thinking about it
Whether you're planning a new build or seeking certification for an existing project, our dedicated Passivhaus team ensures every detail meets this exacting standard.
Most homes in the UK were built before anyone thought seriously about comfort. Cold in winter. Stuffy in summer. Expensive to run. G2 changes that. We work with your existing home — not against it — transforming how it feels to live there, reducing its impact on the climate, without losing what makes it yours.
Our Approach:
We assess the whole home first — before a single decision is made
Better insulation, improved airtightness, smarter windows — done in the right order
A home that stays warm without the heating working overtime
Sensitive to the character of your home, uncompromising on the result
Verified performance improvement — not a promise, a measurement
Great projects deserve great coordination. When design thinking and construction expertise work in harmony — under one roof, with one team taking full ownership — something remarkable happens. Decisions get made faster. Nothing gets lost in translation. And the build delivers exactly what was promised.
G2 Design & Build brings that clarity to every project we take on. Whether you're a homeowner with a vision, a designer looking for a construction partner who genuinely understands the brief, or a developer who needs certainty of delivery — we work with you, not around you.
Passivhaus new builds, deep retrofits, high-spec extensions. Whatever the project, the standard never changes: Beautifully crafted, healthy homes, delivered with care and precision.
Our Process:
One team, one point of contact — from first conversation to final handover
Collaborative by nature — we work alongside your designer, architect, or directly with you
Every project considered through the lens of performance, comfort, and your aspirations
Passivhaus, retrofit, or high-spec extension — the same standard applied throughout
A home — or development — that performs beautifully from the moment it's complete
Not every project is a Passivhaus new build. G2 takes on a select number of extension and refurbishment projects each year — work where design ambition and build quality matter, and where a client values getting it right over getting it cheapest. The same standard applies: careful specification, honest programme, and a result we’re proud to walk away from. Where the opportunity exists to raise a home’s performance — better insulation, improved airtightness, smarter glazing — we’ll always raise it.
Our Approach:
High-spec single and double-storey extensions, including structural and basement work
Whole-house refurbishments with a focus on quality finish and longevity
Performance improvements integrated where the brief allows
Fabric-first thinking applied to every element, regardless of project scale
