Keystone Renovations is founded
One engineer, one van and a promise to turn up when we say we will in Cardiff.
Our story
Small team, big standards.
How Keystone Renovations became Cardiff's favourite company.
0+Jobs completed
0 hrsEmergency response time
Why Keystone Renovations
Four reasons customers trust Keystone Renovations.
Keystone Renovations keeps homes and businesses across Cardiff warm, safe and running. Qualified engineers, fixed written quotes and a 10-year guarantee on every installation.
- 01
Fixed, written quotes
Clear prices before any work starts, with no surprises on the invoice.
- 02
Qualified engineers
Gas Safe registered and Part P certified, with ID checked on every visit.
- 03
24/7 emergencies
An engineer anywhere in Cardiff within two hours, day or night.
- 04
10-year guarantee
Every installation and renovation backed by our 10-year workmanship guarantee.
Our mission
To be the first place Cardiff turns to, and the one they come back to.
Gareth MillsFounder & Heating Engineer
01
Listen first
Unhurried time and a team who remember your name and what you need.
02
Deliver with expertise
Experienced engineers, the right tools and high standards, all under one roof.
03
Stay local
Rooted in Cardiff, working with local partners, and a team who live here too.
Our story
How we got here.
From day one to today: the moments that shaped Keystone Renovations in Cardiff.
2006
2012
Electrical division
Certified electricians join, so customers get one team for every job.
2018
Renovations launch
In-house bathroom and kitchen renovations with dedicated project managers.
2024
Renewables & EV
Heat pumps, solar and EV chargers for a lower-carbon home.
Meet the team
The people behind Keystone Renovations.
Experienced engineers who know Cardiff, take the time to listen and get the details right.
0+ yrsexperience
Boiler installation
Gareth Mills
Founder & Heating Engineer
Started Keystone Renovations with one van; still surveys every heat pump install personally.
0 yrsexperience
Boiler service
Nadia Hussain
Operations Manager
Runs our booking team and makes sure every engineer turns up on time.
0 yrsexperience
Emergency plumbing
Liam Carter
Renovations Project Manager
Fourteen years managing kitchen and bathroom projects, start to finish.
0 yrsexperience
Bathroom renovation
Sean O'Neill
Lead Electrician
Part P certified and our go-to for rewires, EV chargers and commercial testing.
0+ yrsexperience
Full & partial rewiring
Kofi Mensah
Gas Safe Engineer
Specialist in boiler installs and fault-finding on older systems.
Trusted & accredited
Accredited, reviewed and trusted locally.
Keystone Renovations meets the standards our customers expect, and we're proud to show it.
From 1,800+ reviews0
Our engineers work to recognised standards, and we're independently reviewed by the customers we work with.
More about usGas Safe registered
Part P certified electricians
10-year guarantee
Fully insured to £5m
Get started
Ready when you are. Free quote today.
Tell us what you need and our engineers will take it from there. It's quick, there's no obligation and we reply the same day.