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Who is Resi?

5 min read
Oct '25 • by Heather

Quick summary

Resi offers affordable architectural services for home extensions, with costs starting at around £1,200 for a typical project, including design, planning, and builder introductions. The process generally takes a few weeks to several months, depending on project complexity and planning approval. They focus on making renovations straightforward and transparent for homeowners.

We’re the UK's leading architecture practice for everyday homeowners. Since opening our doors in 2017, we’ve helped transform over 10,000 properties nationwide.

Whether you’re taking on an extension, conversion, or simple renovation, our unique service enables you to manage your whole project from the comfort of your own home.

How did Resi start?

In 2016, our co-founder, Alex, wanted to add a simple side return extension to her home. Three months later, she found herself thousands of pounds lighter with nothing on paper.

Thousands of homeowners and developers all over the UK are facing this same struggle. Having never used an architect before, they’re left baffled by confusing prices and processes that seem to yield little or no result. Because of this, some choose to avoid architects altogether, leaving them vulnerable to cowboy design and build companies.

Seeing an opportunity to change things, Alex enlisted her trusted business partner, Jules, to help figure out a solution. Together, these two leading entrepreneurs envisioned a new way of doing things. A platform that would open up affordable, fast, high-quality architectural services for every UK home.

They put this idea to Alex’s new team of architects, Nick and Rich, who both jumped at the chance to shake up the industry. Combining their expertise, our founders created Resi, an architectural practice designed for everyday homeowners.

No more confusing jargon. No hidden fees. No more delays.

At Resi, we believe everyone deserves to make their house a home. We want to make it easier for homeowners to create their happy space, and we’re achieving that goal with every project we work on.

Getting an extension with permitted development

What does Resi do?

Thanks to Resi’s all-encompassing service, there’s never been an easier way to get your home ready for renovation.

Although we started as an architecture practice, we’ve now expanded to help you during each step of the journey. Here’s how we can help:

Step 1: Research

Before you decide whether or not you want to work with Resi, you can use our free Project Matcher tool to browse extensions on homes just like yours. That, and our library of helpful articles and guides, will help you to see what’s possible, what’s likely to get planning approval, and how much an extension might cost before getting started.

Step 2: Measured survey

Once you’ve signed up with Resi and had your initial calls, we’ll visit your home to capture precise measurements and 360° imagery using 3D scanning technology (a measured survey). The scan is then turned into an accurate digital model of your property, ready for the design phase.

Step 3: Architectural designs and drawings

Then comes the fun part: designing your extension live with your designer during screenshare sessions. You’ll be able to visualise your design clearly in 3D and manage updates easily through your online dashboard.

How much does planning permission cost?

Step 4: Finance

Once your designs are confirmed, we’ll work with you to provide a professional estimate on how much the whole thing will cost. This will give you a detailed breakdown of the budget you’ll need, including everything from timings, labour, and cost of materials. If you need it, our Resi Finance experts will be on hand to advise you on how to fund your project. Whether that’s moving around your savings or even remortgaging your home, we’ll help you find a route that’s tailored to you.

Step 5: Planning support

Whether your project needs planning permission or falls under permitted development, our experts (including ex-council officers who know all the pitfalls to watch out for) will manage your application, liaising with the local authority on your behalf. With an approval rating of over 90%, it’s useful to have our planning consultants on your team.

Step 6: Building regulations

Our team of experts prepare a full drawing package to make sure your extension meets building regulations. Plus, we can introduce you to trusted specialists like structural engineers, drainage surveyors, and party wall surveyors if you need them.

Step 7: Introductions to vetted builders

Once drawings and planning are sorted, it can be tricky to know where to start finding the experts to build your extension. Our Resi Connect service introduces you to vetted contractors in your area to make this a little less stressful. We vet contractors based on their past work, whether or not they’re Trustmark or FMB affiliated, if they have the relevant insurances in place, if they meet minimum financial standards, and references from previous customers and trade. You can select which contractors to get quotes from, and our advisors will work with you to decide who’s best for your project.

How does Resi work?

Our aim is to make home extensions feel easy, and that’s all thanks to our dashboard, an online platform we built. Some of its features include…

  • Project progress updates
  • Screen-sharing calls
  • Planning updates
  • Finance enquiry
  • Transparent financial management
  • Files & uploads management
  • Instant messenger
  • Find suppliers for your project
  • Invite a collaborator
  • Manage multiple projects easily

You can try out our dashboard for yourself. Simply sign up and log in to our site to create a brief for your project.

his Resi renovation in leafy Forest Hill has invited the outdoors in with plenty of pretty indoor plants to brighten the space

Free advice consultations with Resi

Doing a home extension is no small feat, which is why we offer the chance to chat with us before you decide to work with us for the design and planning process. Unlike other architecture practices, which can charge up to £150 for the service, our consultations are completely free.
We want to ensure all homeowners have the advice they need to make the best decisions for their property. If you’re curious about what hidden home potential you could unlock, why not book some time with our experts?

During your session, we can discuss…

  • Budget
  • Timings
  • Planning
  • Professionals required
  • Potential hurdles
  • Design ideas

Plus anything else you might be curious about. Go on, why not try us out for yourself?

Speak to an expert

Our expert team offer free 30 minute phone consultations to help with your project.

Select a date for a call

Research Hub

Explore real extensions, calculate costs, design your own, and more Start browsing