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Find the right builder for your extension

Join 4,600+ UK homeowners who've matched with vetted builders, received expert guidance, and protected their projects with Resi.

Match with curated, vetted builders

Expert support reviewing proposals

100% free service

Optional insurance and payment protection for added peace of mind

Don't just take our word for it

The team at Resi have been so unbelievably help...

The team at Resi have been so unbelievably help...

Annie • NW7

Custom Custom

took all the work and kept me in touch…

took all the work and kept me in touch all the ...

Roger • NW5

Ground floor Internal alteration

I found Resi personnel very helpful

I found Resi personnel very helpful. Their meth...

Jacqueline • CM3

Ground floor Rear

Resi have been amazing from the start

Resi have been amazing from the start, the comm...

Obi • BR5

Garden Annex

It is a 10 from me! :)

It is a 10 from me! :) I found Resi through onl...

Yiming • W14

Custom Custom

Working with Resi has been such a pleasure from...

Working with Resi has been such a pleasure from...

Saqib • SL6

Ground floor Wraparound

Outstanding Service

Shabnam from the Resi finance team is exception...

Joie • MK10

Ground floor Rear

Our experience with Resi

Our experience with Resi was one of the best cu...

Abu • DA8

Loft Hip to gable with main dormer

Excellent

Really good and easy to use online platform

Richard • TW11

Ground floor Wraparound

Delighted home owner

Fantastic service would highly recommend this e...

Lyn • BR6

Ground floor Rear

Really good service,

Really good service, we dealt with multiple at ...

Nick • NW10

Loft Main dormer

Excellent, friendly service

Jack at Resi was brilliant at bringing together...

Oliver • W4

Ground floor Wraparound

How we help you build better

Professional tender comparison

We offer free tender review appointments, giving you impartial, expert advice to help you compare builders' proposals like-for-like, so you can choose with confidence.

 

Vetted builders only

We only work with contractors who pass our rigorous checks, are continually assessed for performance, and specialise in residential projects like rear extensions, loft conversions, and side-returns.

Learn how we vet builders
 

Protect your project

Keep your money safe with payments held securely until each milestone is approved. If something goes wrong, you're backed by independent dispute support — plus access exclusive discounts on renovation insurance to protect your home and your build.

Learn more about project protection
 

Trade discounts, on tap

We can help you save on fixtures and finishes — from tiles to taps. Just ask our Connect Concierge team about the exclusive deals and discounts we have with leading suppliers.

 

1100 stunning extension projects

All completed by builders we introduced

How do we compare?

You won’t get spammed by dozens of unverified accounts

MyBuilder
Free to use
Large network of suppliers
Shortlist of tailored introductions
Tender review calls for impartial, expert advice
100% focused on home extensions
Checkatrade
Free to use
Large network of suppliers
Shortlist of tailored introductions
Tender review calls for impartial, expert advice
100% focused on home extensions
Resi
Free to use
Large network of suppliers
Shortlist of tailored introductions
Tender review calls for impartial, expert advice
100% focused on home extensions
Start a builder search

How it works

Resi isn't your typical 'find a tradesperson' experience. We provide a vetted shortlist of quality builders and help you compare proposals like-for-like.

1. Upload architectural drawings
2. Receive cost estimates from matched builders
3. Video calls with shortlisted builders
4. Detailed, impartial tender comparison over the phone
5. Choose the builder you want to use
6. Contact Resi Concierge to access trade discounts

Why is Resi free?

Our core services - design reviews, vetted builder matching, tender comparisons, and Resi Concierge - are completely free. We're funded by a small commission from builders we introduce to projects.

Where are these builders anyway?

How do we vet them?

Each Resi building contractor must pass the following vetting checks. We only work with builders who meet these criteria

Vetting call
Active website
Known directors
Companies house data
Public liability insurance
Employer's liability insurance
Signs Resi Code of Conduct
Customer testimonials
Multiple recent projects
Prompt response times
Credit risk score
Accreditations
We will tell you if a builder is a member of Trustmark or Federation of Master Builders
Vetting call
Active website
Known directors
Companies house data
Public liability insurance
Employer's liability insurance
Signs Resi Code of Conduct
Customer testimonials
Multiple recent projects
Prompt response times
Credit risk score
Accreditations
We will tell you if a builder is a member of Trustmark or Federation of Master Builders
Find a vetted builder

Protect your project

confidence built in

Payment protect

Keep your money safe and your project on track

  • Project funds are held in a secure, FCA-regulated escrow account.
  • Payments are only released when you're satisfied and sign off each completed milestone.
  • If anything goes wrong, you're backed by independent dispute resolution support.
  • Includes unlimited mediation, plus independent Quantity Surveyor assessments, with on-site visits if needed.
  • Contractors agree to this payment and adjudication process from the start, so expectations are clear.

Small service fee applies

Renovation insurance

Key cover, exclusive rates

  • Standard home insurance often won't cover renovation work. Having building work may even void your policy.
  • Bolt-ons often miss key risks like structural damage or theft. That's why dedicated renovation cover matters.
  • This is specialist cover, provided by one of the UK's leading renovation insurance providers.
  • Flexible policy options to suit your project, from small updates to full-scale builds.
  • Resi customers receive 25% off broker fees with no admin costs.
Start a builder search

Selecting the right contractor

Regardless of whether you use Connect or chose to source a builder on your own, the Connect team always recommend that you follow these steps...

Check their finances

It’s important that you take the time to do a financial background check on your builder’s company.

If you see any changes to the directors, this could be a red flag the company may have filed for bankruptcy in the past.

Check the details

When it comes to your quote, the devil is in the detail.

A good contractor should break down their pricing so you can check every design component has been properly accounted for.

If your quote is too vague, ask your builder to be more transparent with their numbers or seek a construction consultant to guide you.

Customer references

At a minimum, you should speak to at least two previous clients.

One from 6 months ago and another from 18 months ago.

This should help give you an honest overview of your contractor’s current work practices, as well as showing how their work stands the test of time.

To be extra thorough, we also recommend speaking to a client that’s currently onsite to help round out your understanding of a contractor’s product delivery.

Contracts and insurance

Ask your contractor which contract they’ll be using.

We always recommend homeowners go for a JCT contract, as this provides the most security and accountability.

This is recommended by RIBA and is recognised throughout the industry.

Read our guide on construction insurance to learn more

Protect yourself with the right payment plan

We recommend you agree to a payment plan that has you releasing funds when milestones have been met.

These milestones should be the key stages of the build, such as your foundations, superstructure, roof installation, etc.

This will ensure the builder is the one funding the project, while also letting you stay in control of quality throughout construction.

If you can perform quality checks at each milestone, this will provide further protection, and something a project manager can do on your behalf.

Look for anomalies

Watch out for those ‘too good to be true’ quotes and turnarounds.

Often, when a project is priced significantly lower than its counterparts, it can be a sign that key details have been left out - likewise with super quick time estimates.

Will you work well together?

How did you get on with the contractor? The rapport between you will be just as important to them as it is for you.

A lot of contractors are busy and if they’re offered two potential contracts of similar value and start date, their decision will then be based on the relationship with the client.

After all, construction takes time and plans are liable to change.

Having a good working relationship will make their job that much easier, as it will yours.

Ready to Start?

Upload your plans today and get matched with vetted builders who meet your project's needs.

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