Welcome, Resi Friends!
Excited about your home extension? We are too!
We’ve joined forces with Resi to make home extensions easier and more enjoyable. Our structural engineering expertise combined with their design brilliance means you get the best of both worlds.
What’s included in your quote
Every Resi referral gets the full PorthouseDean service — no add-ons, no surprises.
Free change request
Need adjustments? We include a complimentary change request to make sure your project is right.
No win, no fee guarantee
A full refund if our design isn’t approved by Building Control. With a 100% success rate, you’re in capable hands.
Comprehensive insurance
Professional indemnity cover up to £500,000, safeguarding your project at every step.
Dedicated project coordinator
One named coordinator guides you through the whole process, start to finish.
Free virtual site visit
Insights and recommendations from our engineers without anyone leaving your home.
Free desktop geological report — worth £95
As a friend of Resi, enjoy a complimentary geological report so you know your project is built on solid ground. It’s our way of adding value and helping you make informed decisions.
Build with confidence. Build with PorthouseDean.
Your peace of mind, our priority
The guarantees behind every set of calculations we issue.
- Money-back guarantee. A full refund if we fail to secure Building Control approval.
- Insurance coverage. £500,000 professional indemnity, safeguarding your project at every step.
- 100% success rate. Proven excellence in Building Regulations approval.
Building a better future together
Sustainability is part of the service, not an afterthought.
- Sustainability initiatives. For every project we plant a tree to offset carbon emissions and contribute to a healthier planet.
- Aligned with Resi’s values. Eco-friendly solutions that make a positive impact.
- Join our mission. Build sustainably with PorthouseDean, creating spaces that are beautiful, functional and kind to our planet.
Ready to start your home extension project?
Get your structural calculations quote in minutes — no site visit needed.
Get a Quote