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You dream it, we'll build it.

From lofts and extensions to full refurbishments, we deliver well-built spaces that add real value — managed properly from start to finish.

Ratings

Trusted reviews from Google

Book A Free Consultation

Check Our Services

Schedule a

Free Consultation

Ratings

Trusted reviews from Google

You dream it, we'll build it.

From lofts and extensions to full refurbishments, we deliver well-built spaces that add real value — managed properly from start to finish.

Ratings

Trusted reviews from Google

Book A Free Consultation

Check Our Services

Schedule a

Free Consultation

Ratings

Trusted reviews from Google

You dream it, we'll build it.

From lofts and extensions to full refurbishments, we deliver well-built spaces that add real value — managed properly from start to finish.

Ratings

Trusted reviews from Google

Book A Free Consultation

Check Our Services

Schedule a

Free Consultation

We are a top rated 5 star builders and extension specailists

Excellent work, very pleased with all aspects of this extension project. Attention to detail and standard of workmanship were first class. Totally trustworthy, and reliable.

John Roe, Purley

We are a top rated 5 star builders and extension specailists

Excellent work, very pleased with all aspects of this extension project. Attention to detail and standard of workmanship were first class. Totally trustworthy, and reliable.

John Roe, Purley

We are a top rated 5 star builders and extension specailists

Excellent work, very pleased with all aspects of this extension project. Attention to detail and standard of workmanship were first class. Totally trustworthy, and reliable.

John Roe, Purley

We are a top rated 5 star builders and extension specailists

Excellent work, very pleased with all aspects of this extension project. Attention to detail and standard of workmanship were first class. Totally trustworthy, and reliable.

John Roe, Purley

Servicing in the West London and Surrey area

Our Service - reimagine homes

Explore All Services

Loft Conversions

Transform unused roof space into a bright, functional living area. From design to completion, we deliver high-quality loft conversions that add space, comfort and long-term value.

Loft Conversions

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Loft Conversions

Transform unused roof space into a bright, functional living area. From design to completion, we deliver high-quality loft conversions that add space, comfort and long-term value.

Home Extensions

Create more room to live, work and relax with a well-designed extension. We build seamless additions that enhance your home’s layout, flow and overall value.

Home Extensions

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Home Extensions

Create more room to live, work and relax with a well-designed extension. We build seamless additions that enhance your home’s layout, flow and overall value.

Full Home Refurbishments

Reimagine your entire home with a complete refurbishment. We upgrade, modernise and improve every detail, delivering a cohesive finish that transforms how your space looks and feels

Full Home Refurbishments

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Full Home Refurbishments

Reimagine your entire home with a complete refurbishment. We upgrade, modernise and improve every detail, delivering a cohesive finish that transforms how your space looks and feels

Groundworks and Drainage

Strong foundations are essential to every successful build. We deliver reliable groundworks and drainage solutions, ensuring your project starts right and performs properly for years to come.

Groundworks and Drainage

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Groundworks and Drainage

Strong foundations are essential to every successful build. We deliver reliable groundworks and drainage solutions, ensuring your project starts right and performs properly for years to come.

Planning and Structural Engineering

We support your project from the earliest stages, coordinating planning and structural requirements to ensure everything is compliant, practical and ready for a smooth build process.

Planning and Structural Engineering

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Planning and Structural Engineering

We support your project from the earliest stages, coordinating planning and structural requirements to ensure everything is compliant, practical and ready for a smooth build process.

Domestic & Commercial

From homes to commercial spaces, we deliver high-quality building work tailored to each environment. Every project is approached with the same care, precision and attention to detail.

Domestic & Commercial

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Domestic & Commercial

From homes to commercial spaces, we deliver high-quality building work tailored to each environment. Every project is approached with the same care, precision and attention to detail.

years

We Don’t Just Build — We Transform Spaces

STL Build is a local building company based in Sunbury-on-Thames, working across Surrey, South West London and the surrounding areas.

We go beyond simply constructing spaces. We help homeowners reimagine and unlock the full potential of their property — delivering high-quality, well-designed environments that add lasting value.

STL Build is a local building company based in Sunbury-on-Thames, working across Surrey, South West London and the surrounding areas.

We go beyond simply constructing spaces. We help homeowners reimagine and unlock the full potential of their property — delivering high-quality, well-designed environments that add lasting value.

Every project is fully managed from start to finish, with a focus on clear communication, careful planning and a clean, respectful approach on site. The result is a smooth, well-run build with minimal disruption and a finish that speaks for itself.

From loft conversions and extensions to full property improvements, our work is built on craftsmanship, consistency and trust.

Read about us

Message from Simon

Built on Experience. Delivered with Care.

I’ve spent over 25 years building and renovating homes across Surrey and South West London. Over that time, one thing has never changed — my attention to detail and the standards I expect on every job.

For me, it’s not just about the build itself. It’s about understanding how you live, what you need from your space, and making sure the end result genuinely works for you and your home.

I stay closely involved throughout every project to ensure everything runs as it should — from the first conversation through to the final finish.

For me, it’s not just about the build itself. It’s about understanding how you live, what you need from your space, and making sure the end result genuinely works for you and your home.

I stay closely involved throughout every project to ensure everything runs as it should — from the first conversation through to the final finish.

"More than 25 years on, my standards haven’t changed — every detail still matters."

Simon Lack - Onwer

"More than 25 years on, my standards haven’t changed — every detail still matters."

Simon Lack - Owner

Kind reviews from our trusted customers

Don't take our word for it

“Absolutely fantastic! I would have no hesitation in using them again, nor recommending them. Great workmanship and very tidy."

Sarah Kitley

“Absolutely fantastic! I would have no hesitation in using them again, nor recommending them. Great workmanship and very tidy."

Sarah Kitley

“Absolutely fantastic! I would have no hesitation in using them again, nor recommending them. Great workmanship and very tidy."

Sarah Kitley

"I would like to take this opportunity to State that the above Company have done work on our house on several occasions and I must state that the work and craftsmanship was second to none so I would recommend to anyone looking for any building work to be done get a Quote off this company 1st!"

Brian Pelham

“We used STL Simon Lack to build a double floor wrap round extension in 2014. The workmanship has been fantastic with no faults or problems in over 10 years of it being completed. Thank you Simon."

Ben Sarbutt

“We used STL Simon Lack to build a double floor wrap round extension in 2014. The workmanship has been fantastic with no faults or problems in over 10 years of it being completed. Thank you Simon."

Ben Sarbutt

“We used STL Simon Lack to build a double floor wrap round extension in 2014. The workmanship has been fantastic with no faults or problems in over 10 years of it being completed. Thank you Simon."

Ben Sarbutt

“Very polite, helpful and competent. Work was done very quickly, to a high standard and left tidy and clean afterwards. Will use again."

Michal Majercik

“Very polite, helpful and competent. Work was done very quickly, to a high standard and left tidy and clean afterwards. Will use again."

Michal Majercik

“Very polite, helpful and competent. Work was done very quickly, to a high standard and left tidy and clean afterwards. Will use again."

Michal Majercik

“Simon completed a major extension for our house in Farnham during 2024/5. We were very happy with the quality of the work. He was hard working, tidy and punctual and always took time to explain to us what each stage was. Great job!"

Patrick Gurney