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Extend your

As the UK’s number one home extension company, our architects have the design, planning and building expertise to help you grow your home.


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That wall, your wall.

You know, the one you're forever talking about knocking down to grow your home.

It’s still there. With so much planning to navigate. Costs to calculate. All that admin.

But it’s time to take one last look.

Because together, we’re breaking through that wall.

Just like we have with the 6,000+ homeowners that came before you.

How it works

One of the reasons home renovators love Resi is we can help with every aspect of your project. Got something already covered? No problem! We can help with as much or as little as you need.


We’ll visit your home with a 3D laser scanner to capture everything we need to get your project started.

1-2 weeks


Our skilled designers work closely with you to produce architectural drawings that bring out the best in your home.

6-8 weeks


Using our team of in-house planning officers, we’ll manage your chosen planning route on your behalf.

8-14 weeks


We can help with everything from Building Regulations drawings to introductions to vetted trades professionals.

16-24 weeks


Our finance partners have access to over 90 lenders, helping secure the funds needed to complete your project.

6-8 weeks

"Resi are a great investment.

We saw a couple of ‘all in’ firms before we found Resi. The others were extremely expensive and not as flexible as Resi."

- Helena Drake

Estimate your construction costs

Which part of your property would you like to extend?

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First Floor

Keep your project
on time & budget

With Resi’s unique online Dashboard, you can keep on top of your project. Any time, from anywhere. All for free.


Never miss a thing

Keep on top of your tasks, appointments and timelines so you never have to worry about holding up the project, whether you’re on your laptop or phone.

Know who and when to hire

Whatever trades professional you need for your project, we can introduce you to vetted contractors and even give you a helpful prompt when to hire them to keep things running smoothly.

Learn the industry lingo

We get it, there’s a lot to learn and the industry can be overwhelming. The Resi dashboard provides heaps of helpful videos, articles and guides.

Keep everything in one place

There’s a lot of admin, documents and messages involved in a renovation. But your Resi dashboard keeps it all neatly organised so you don’t have to go hunting for it.

Stay on top of your budget

We’re working on a handy budgeting tool so you know what you’ve spent, what you’ve spent it on, and get helpful alerts in case you’re at risk of going over budget. Coming soon!

“The best bit has been the online dashboard. It helps keep all information in one place and keeps everything on track while demystifying what is a complex process.

So much better than previous experiences.”

Alex Wood, Stratford

Hire your home extension dream team

Hiring the right trades professionals can make or break your project.

Resi can help introduce you to vetted professionals in your area, from building contractors and structural engineers to CCTV drainage surveyors and more.

“We used Resi's services to engage on a number of levels from hiring the structural engineer, to approved building inspectors.

They really held our hands through the process.

The whole experience, which let's face it can be pretty daunting, was made so much easier by having such a dedicated team.

We cannot recommend Resi enough as it's clear to us that it's not just about the services they offer its more about the clients lived experiences.”

D. Sandhu, Greenwich

We've helped more UK homeowners extend their house than any other architect

The average architect completes ~12 projects per year

Resi completes over 1,500 projects per year.

Worried about getting planning permission?
We've secured 7,600 of those, too.

Enter your postcode to see some recent projects in your area

What makes a home a happy home?

Architecture shouldn’t just be about aesthetics and grand designs. It’s about how your home makes you feel.

Resi is the first architectural design practise to be guided by the 6 pillars discovered in the Science of a Happy Home report.



Adaptable homes are able to meet our changing needs and respond to our daily rhythms, as well as the long term changes in our lives.


A home is a place to connect, giving us the space to interact with family and friends while also maintaining our relationship to the outside world.


Who we are should shape where we live. A home should be a mirror which reflects our values and personalities - uniquely tailored to who we are.


To be nourishing our homes should provide the conditions we need to thrive, optimising everything from light levels to air and sound quality.


After a long day our home should help us switch off, with spaces that make us feel calm, comfortable and at ease.


Homes that are secure provide us with shelter, safety and stability, and we don’t have too much to worry about in terms of looking after them.

Get an instant quote

Please answer a few quick questions about your project to retrieve your quote.

Ground Floor
First Floor


What does Resi offer?

Resi brings together all the architectural services you’ll need to get ready to build.

These include…

  1. Finance
  2. Measured surveys
  3. Home design
  4. 3D models and interactive walkthroughs
  5. Planning submission
  6. Party wall surveys
  7. Structural engineering
  8. Building regulations

At Resi, our mission is to help you grow your home with confidence. Our Connect service introduces you to vetted contractors who can help bring your designs to life during construction. We vet contractors by assessing them against a range of criteria amongst which are: whether or not they are Trustmark or FMB affiliated, whether they have the relevant insurances in place; an assessment of their past work; meeting minimum financial standards; and finally, references from both previous customers and trade.

We’re the perfect starting point for any homeowner looking to dramatically transform their property. Taking you step by step through all the nitty gritty of planning, while still allowing you the freedom to design a space perfectly suited to your home’s needs.

All this is facilitated by our online platform, which allows you to manage everything in one easy to use place. You’ll be able to submit your home details, view perspective designs, and chat to your architect - all from the from comfort of your own home.

Put simply: Resi offers all the benefits of architecture, with none of the headaches.

Why would I use Resi?

We recommend using our services if you’re considering any major home project, such as an extension, conversion, significant renovation, or new build.

Working with an architectural service has a number of benefits.

  1. Better design
  2. Better utilisation of space
  3. Increased chance of planning approval
  4. More protection from bad practices

To name just a few!

Of course, we’re more than just an architectural service. Our all-in-one platform brings together everything you need to get your ideas ready for the construction site. Alongside design and planning, this includes surveying, building regulations, financing, and introductions to local professionals.

Our Dashboard will make sure you stay up to date with each new development, while also allowing you to reach our team with any questions you might have. You can review documents, submit revision notes, assess local contractors, and even explore your financing options. Ultimately, thanks to Resi, there’s never been a more joyful way to grow your home.

How much does an architect cost in the UK?

The cost of an architect varies. When it comes to traditional architecture practices, the industry typically recommends you work out the cost of your architect based on a percentage of your total budget.

On average, a traditional practice will charge between 5% - 10%.

For example, let’s say you’re building a classic rear extension in London and it’s expected your project will cost around £75,000 overall. If you’re using a traditional practice, you’ll need to budget between £3750 and £7500 for your architect.

If your architect isn’t using a percentage model, then they might be charging you by the hour. On average, this can be anywhere between £75 - £200 per hour. How many hours your project will need will depend on both the size and complexity.

Want to know the cost of Resi’s architectural services? Try our quick quote tool.

Can I design my own house without an architect?

There’s no legal requirement to have an architect by your side. However, this doesn’t mean you shouldn’t seriously consider hiring one. For any major project, such as extension, extensive renovation, or new build, an architect can help you get the most out of your project, ensure it meets all legal requirements, advise on budgets and contractors, plus much more.

Should I hire an architect or engineer?

Structural engineers are a different kettle of fish to architects. Where architects can cover a wide range of services, structural engineers tend to specialise in only a few key areas - namely, making your house stand up. Structural engineers are mainly needed if you’re doing anything that might affect the structure of your home. Be this a rear extension, dormer loft conversion, or even removing a chimney. Typically during the building regulations stage, your structural engineer will calculate the weight of your proposed structure, and specify key elements such as steel beams.

In contrast, an architect can cover...

  • Design and architectural drawings
  • 3D models
  • Planning submission
  • Building regulations
  • Contractor recommendations
  • Site visits
  • How do I find a good architect?

    Finding an architect can be done in minutes but finding a GOOD architect can take work. When considering any architect, we always recommend you take the time to have a consultation with their team. You should then take a look at their portfolio and see if their work matches your requirements, as well as check to make sure they have experience of working with your local authority.

    A lot of homeowners get lured in by fancy awards, but unless you have the desire (and budget) for conceptual architectural design, you might be happier with an architect who works predominantly with everyday homeowners.

    And, of course, you should always pay close attention to customer reviews.

    Does an architect have to be RIBA registered?

    In order to design a home, an architect doesn’t necessarily need to be a RIBA registered architect and it doesn’t always guarantee the best results.

    At Resi, we're lucky to have RIBA architects on board, but we also have a whole host of other architects from different backgrounds who have a proven track record delivering great everyday homes. Since 2016, we’ve helped over 3000 homeowners nationwide and it is this experience, not a certificate, that makes us a fantastic service.

    Are architects worth the money?

    Put simply: yes! Architects are masters of their craft and can bring plenty of benefits to the home renovation process. By bringing one on board you will enjoy…

    A more beautiful and functional space. Architects can help ensure you maximise your space and customise the layout to the unique way your family lives, rather than just following the trends.

    Increased planning success. Architects come with years of experience, not only in design, but planning. Chances are they’ll have dealt with your local authority in the past, and know how to research your area. Meaning you’re far more likely to secure planning success with an architect, than without.

    Budget management. At Resi, our architects make sure you have a clear view of not only our charges, but of future professionals you’ll have to contract. We’ll advise on how much you’ll need for what, and when you’ll likely be parting with it. Not only that, our Resi Finance team can also help you explore your funding options and find the right route for your home.