Builders In London Colney

Builders In
London Colney

Are you looking for credible and highly-rated builders in London Colney?

We have over 30 5* reviews from many happy customers. 

cjs house 100

Local Builders

50+ years of construction experience delivering high standards.

cjs insurance

Insured building contractors

Enjoy peace of mind knowing all our construction work is fully insured.

cjs trust

Trustworthy St
Albans builders

Rated as the best builders, more than 90% of our building work comes from recommendations.

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Choose Us

Why Choose Us As Your London Colney Builders?

We reside and operate in London Colney in Hertfordshire and take pride in providing exceptional craftsmanship and a professional approach. Our customers have rated us as the top builders in London Colney, with 5-star reviews, and 90% of our work comes from recommendations from satisfied neighbours, family, and friends. We are honoured to be an active part of the community. To learn more, please visit our About us. page. 


We check in weekly

We know how important it is to be kept up to date on the progress of your project.


Free initial consultation

We provide precise advice and knowledge to help you get started with your project.


Genuine 5* reviews

With 5* reviews on Trustpilot, You can read for yourself what an excellent job we do for our customers.


Useful Local Contacts

We have built a diverse list of reliable local contacts, saving you money, Time and hassle.



Building Services London Colney

Home Extensions

single storey extension st albans

Loft conversions

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Garage Converions

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Garden Rooms

Garden room built by CJ Smiths in st albans

Home Refurbishments

kitchen extension st albans


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Local Builders

Cjsmiths builders London Colney covers all aspects of building work to a very high standard. This includes anything from home refurbishments to home extensions and loft conversions. We are a building company that takes our reputation seriously, aiming to provide the highest quality construction work.

If you are looking for trusted builders in Hertfordshire, feel free to contact us to request a free quote, and we will be able to provide you with an accurate estimate for your project.



What Building Services
Can We Do For You?

Please take a look at some of the most recent construction projects we have completed in St Albans Hertfordshire. Click show more to go through to the projects page.

Complete Renovation And Extension - St Albans

Cjsmiths managed this project from start to finish and we are very proud of the result. We completed a double-storey rear extension and a single-storey front extension. And refurbed the existing home.

Single Storey Rear Kitchen Extension - St Albans

Space is a growing need we all face. Adding a single-storey rear extension to the house increased the space downstairs. Allowing our customers to expand the kitchen area, and increase the natural light.

Ground Floor Extension And Landscaping- St Albans

This beautiful rear extension increased the light and kitchen space. We installed a new pathway around the house and an impressive patio. This increased the property's curb appeal and functionality.



Building Contractors In London Colney

A Fully Managed Solution

Dealing with multiple suppliers and tradesmen while trying to keep a project within budget can be a source of immense stress. The incessant phone calls only add to the pressure. However, our team is equipped to manage the entire process, from coordinating with electricians to collaborating with bifold door manufacturers.

Our clients attest that this is the most significant advantage of partnering with us, as it significantly alleviates the stress associated with construction projects. By entrusting us with the responsibility of overseeing the various components of your project, you can enjoy a sense of tranquility and confidence, knowing that everything is under control.

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Our Process

Service Process

Follow along with our proven four-step process to designing and building the vision you’ve always imagined.


Get Your Free Quote

reach out to us and schedule a free consultation to kickstart your building journey.

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We Plan Together

we'll work together to design and plan the specifics of your project.


We Manage And Build

Our team will manage and build your project according to your specifications


Your Left Happy

You can sit back and relax while we handle all the hard work.



Client Testimony

What Our London Colney Clients
Say About Us?

Feel free to read more about what our previous clients have said about us designing and building their vision.

HK Buono
HK Buono
Had my garden renovation nicely done. Staff are attentive, sincere, efficient and knowledgeable. Able to answer to all my doubts and give constructive advice when facing contingent issues. They also clean up the place at the end of the project, no follow up cleaning needed. One good builder with integrity, knowledge, expertise and efficiency. Will definitely call them up for my next project. Highly recommended.
Deepak Anand
Deepak Anand
Assigning Craig to manage our life long dream of creating a big kitchen/living room (90sqm) was one of the best decisions we ever made. We got in touch with Craig 1 year in advance of works commencing and from the get go Craig scheduled an initial meeting to discuss our plans. Leaving the meeting Craig gave us new ideas and put no pressure on signing and was happy to work around us. Having visited several existing projects and received great customer feedback, we knew Craig was the builder for us as the quality of work was just exemplary. Craig saved us 5K by urging us to allow him to project manage the build and true to his word, he was on onsite multiple times per day, making sure everything was perfect. Along the way, we did encounter some problems, due to the existing condition of the garden but Craig always had a plan to work around them and not change designs with little or no change in cost. Craigs team are highly skilled, clean and respectful. They always tidied and locked up at the end of each day which left us worry free. One great trait about Craig; he treats his jobs like his own home and if he’s not happy with it, the project does not move to the next stage. It is no wonder he is respected in St Albans as a 5star builder. We will 100% be onboarding Craig again to do our 2nd story and driveway in the future. A big thankyou to Craig and his excellent team.
Hannah Franco
Hannah Franco
Craig and his guys did some work in our garden for us and completely transformed it. We couldn’t be happier with the quality of work. The guys working for Craig were polite, punctual and respectful. I will be going back to Craig for our next house project.
Siddika Walji
Siddika Walji
Thanks Craig for creating a beautiful outbuilding at the back of our garden. It looks stunning!
Rebecca Hopkins
Rebecca Hopkins
In the last couple of years we have used CJ Smiths to build us a house from scratch and also to completely renovate and extend our current home. We have been absolutely delighted with the service we have received and have recommended CJ Smiths to many friends and family. Craig and all of his team are professional, friendly and trustworthy and my family have always been pleased to have them working in our home. They are extremely tidy and mindful when working in a home with children, so we’ve never had to worry about any sharp edges/power tools being left around for little people to find! We have also never had to worry about builder’s bad language around the kids as they are all family men and are a pleasure to have around. The jobs have always been finished to a high standard and Craig is completely transparent when it comes to timings, costs, payment schedules and any delays that might crop up due to unforeseen circumstances like weather etc. The team works quickly and efficiently and you will actually miss them when they’re gone!!! Especially Terry the chippie who is completely wonderful and will even make a fuss of your dog and let it out for you if you need him to! 100% recommend CJ Smiths to anyone!
Natalie Atkins
Natalie Atkins
We have used Craig and his team for 3 home-renovation projects now, the last of which being July 2022 - we are looking forward to the team completing a 2-storey side extension for us later this year. - Trustworthy This is number one for us. They do what they say when they say they will do it and at the price agreed. Additional costs were extras added on / changed by us during the project. - Friendly Craig and his team have all been friendly and a pleasure to have in the property. They are polite and respectful and we are comfortable with them (especially as we have young children around). - Tidy The team tidy up at the end of each day and leave tools safely out the way. - Quality Work completed by Craig, his team & contractors has been to a high standard and where there has been a snag list, minor issues have been addressed promptly. -Communication Craig is available to us throughout each project by WhatsApp or phone. It helps having a central person to coordinate with all parties.
Robert Quinn
Robert Quinn
Highly recommended… We recently used CJ Smiths for an extension and full house renovation. From the first meeting, to completing the project, we found Craig and his team absolutely faultless. The project was on time but for unavoidable weather delays. There were also no surprises from a budget perspective. Anything that required an “extra” or a design change was met with a pragmatic response and always a mutually agreeable way of resolving - refreshing in a world where most things are viewed as a problem. Nothing was too much hassle for the CJ Smiths team, who always went above and beyond to ensure we were kept informed of every small change or decision that needed to be made. We even mildly miss the busy house when everyone was on site. A huge thank you to the entire CJ Smiths team - we are delighted with the end result and would highly recommend them to anyone embarking on a renovation.
Philip Tam
Philip Tam
CJ Smiths is a great choice for anyone looking for quality workmanship and friendly service. They pay attention to every detail and deliver excellent results. Their prices are also very reasonable for the value they provide. I was very satisfied with their work and would highly recommend them to anyone. CJ Smiths is the best in the business! 👍🏼
dale Anthony
dale Anthony
Great service - very reliable friendly builders! We had our garden room built in St Albans by Cjsmiths, we found that the level of advice and service was a cut above the builders we have used in the past. During the planning phase, they answered all of our concerns and together we were able to plan and create the perfect space we wanted. The team were very polite and respectful during the build, cleaning up the site daily and treating our home and garden like it was their own! We are incredibly happy with the final result, it was completed on time and to a very high standard. We highly recommend Cjsmiths to anyone looking for builders in St Albans! Thanks
Ryan Smith
Ryan Smith
Outstanding job! Craig and his team completed an loft conversion for us at the beginning of this year and we couldn't be happier. We were so impressed by his level of professionalism from the very start. He managed our expectations and gave us a realistic timeline for the loft conversion to be completed, which ended up being very close to his estimate. We highly recommend C J Smiths for anyone looking for a loft conversion or building work in general. We will definitely be using C J Smiths again in the future. Great job!
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Frequently Asked Questions About London Colney Builders

If you have questions that still need to be answered, please email us. We would be happy to assist you!

A: Yes, of course. We would love you to. With all of our building services being completed in the St.Albans Hertfordshire area, we have many happy customers that would be delighted to show you their property!

A: This will always depend on your requirements. During the initial site visit and consultation, we will determine your project specifics and provide an accurate start date. Please do keep in mind, We are highly recommended and reputable, meaning we are busy. Sometimes customers will face longer lead times than other building firms can offer. BUT, We believe in doing the job right and the FIRST TIME.

A: Yes, as part of our service, we provide professional guidance and help with this sometimes reasonably complex process. Cjsmiths has an excellent relationship with the city council and local building control st albans. We have helped many customers with their applications. 

A: Yes, of course, We work closely with our professional architect and have designed and completed many projects with him. He has decades of experience and can offer advice and suggestions to suit your budget.

A: Payment upfront is not required. We will sit down and consult with you to understand the specifics you are looking for. Once we know what you require, we will send you a detailed quote for the work. We will draw up a payment plan and agree upon the terms and milestones where payments will be made.

Yes, Cjsmiths are based in London Colney, St.Albans. We have provided building services in the area since 2010 and have served many happy customers.

Do You Have Any Questions?

We are here to help! Please feel free to contact us if you have any questions.

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