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A cozy living room featuring a fireplace and a large window, allowing natural light to fill the space

Expert builders in Royston with a 9.7 Checkatrade rating

Building better spaces, creating lasting value.

Fully managed team. Free no-obligation quotes. 4.97 Trusted Trader rating.

What sets us apart

Wide range of building services

Comprehensive solutions for renovation, extension, and construction projects.

Experienced, skilled team

Qualified professionals delivering dependable workmanship.

Quality results in every project

High standards are maintained from start to finish.

What we offer

A brick wall with a broom and shovel leaning against it, suggesting a cleaning or maintenance area

House extensions

Expand your living space with our tailored single- or double-storey house extensions, designed to match your property and your needs.

A cozy small living room featuring a desk and a couch, with warm lighting and decorative elements

Garage conversions

Transform your unused garage into a practical space like a home office, gym, or bedroom, with conversions built to last by our team.

House renovations

Upgrade your home with our renovations, including painting, patios, and complete refurbishments to modernise your property.

New brickwork extension under construction

Bricklaying

Benefit from our skilled brickwork for new builds, extensions, repairs, and matching existing brickwork to ensure a flawless finish.

Rebuilt red brick chimney stack

Chimney services

Rely on us for chimney repairs, removals, and restorations to improve both the safety and appearance of your home.

A house surrounded by scaffolding, indicating ongoing construction or renovation work on the exterior

General building work

From groundworks to major structural projects, we cover every aspect of construction with our commitment to high standards.

Your trusted builders in Royston

Mills Building Co has spent the past 15 years building a reputation for honest, reliable work throughout Royston, Hertfordshire, and beyond. We know that starting any building project can be daunting, whether you're planning a home extension, garage conversion, or long-awaited renovation. Our team combines practical experience with industry-recognised qualifications, including a City & Guilds of London Institute Bricklaying Level 2 NVQ, ensuring high standards on every project. We work with trusted subcontractors to manage every detail carefully, ensuring you feel secure throughout the process. You can also explore our blog for useful insights, advice, and inspiration for your next building project.

A general interior view of a home extension used as a dining room with dining table and ch
A row of houses featuring distinct black and white roofs, showcasing a unique architectural style

Why choose us for your next project?

  • 9.7 rating on Checkatrade.

  • Fully managed team handles everything.

  • All work is covered by free, no-obligation quotes.

  • Experienced in domestic and commercial builds.

  • Friendly service that puts you first.

The team was great and reliable and did a great job. Very reasonably priced compared to some of the other quotes I received. Will be using them again. Highly Recommended!

Full-service building experts you can rely on

You want expert builders who turn up when they say they will, keep the site tidy, and actually listen to what you want for your home. We offer all of that, along with flexible skills that cover everything from brickwork and groundworks to carpentry, plumbing, chimney services and electrical work through our reliable subcontractors. Mills Building Co is proud to offer a full end-to-end service, so you never have to juggle different trades or chase contractors. We manage your project with the same care we'd want for our homes, so you can get back to enjoying your space sooner.

Frequently asked questions

Expert builders delivering quality results

Call now and let us help you achieve your plans.

A patio featuring a table with chairs and a large umbrella providing shade.
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