Design, Simplified: Introducing Extension Co. 07.07.25
At House Form, we believe that great design should be accessible—not reserved for the few. That belief led to the creation of our sister company: The Extension Co. A fresh-thinking venture, Extension Co. is reimagining how everyday homeowners approach home improvement—through thoughtful, efficient, architect-designed extensions that balance quality, speed, and affordability.
Why The Extension Co.?
The residential extension market is full of compromise. Homeowners often face a tough choice: invest heavily in bespoke architectural design, or settle for something off-the-shelf from a builder-led team. The Extension Co. bridges this gap.
By focusing on post-2005 homes, Extension Co. leverages repeatable design packages, streamlined processes, and pre-vetted construction models to offer architect-led solutions at a fraction of the typical cost. It’s an approach rooted in House Form’s commitment to clarity, quality, and sustainability, but tailored for a broader audience.
Single Storey Rear Extension
A Smarter Way to Extend
At the heart of Extension Co.’s model is the idea that simplicity can still mean sophistication. Each extension type—be it a Single Storey Rear Extension (ECo. Family), Loft Conversion (ECo. Loft), or Garden Outbuilding (ECo. Office, Studio, or Annexe)—is designed with performance and planning efficiency in mind.
These aren’t flat-pack solutions. Each ECo. project is:
Architect-designed, with a focus on light, space, and proportion
Optimised for planning and building regulations compliance
Delivered through a clear, fixed-cost process, giving homeowners certainty and confidence
For families looking to grow, professionals working from home, or anyone craving more usable space without the risk of spiralling budgets, Extension Co. offers a trusted route forward.
Garden Room Internal View
Shared Values, Shared Vision
The Extension Co. operates with the same values that guide us at House Form:
Design integrity without complexity
Sustainable methods that lower impact and improve comfort
Honest pricing, clear process, and well-built results
And just as House Form delivers fully bespoke architecture, Extension Co. delivers repeatable quality at scale—setting a new benchmark in the mainstream extension market.
Thinking About Extending?
If you’re considering a home extension but aren’t sure where to start—or whether the full bespoke route is right for you—Extension Co. might be the perfect fit. Or feel free to get in touch through House Form and we’ll help guide you to the right path.