13 Railway Road, Darwen
Lancashire BB3 2RG
01254 492329
Info@Buildersalliance.co.uk
08.00 TO 18.00
Monday to Saturday


Need more space but don’t want to move? A professionally built home extension is the perfect way to transform your property and increase its value. With house prices continuing to rise, more homeowners are choosing to expand rather than relocate and Builders Alliance is here to guide you every step of the way. We specialise in house extensions, home improvements, and residential construction, delivering tailored solutions that match your vision and budget. From the initial consultation through to design collaboration with your architect and full project completion, our experienced team ensures a smooth and stress-free process.
Our Lancashire-based builders bring years of hands-on experience across a wide range of construction projects. Whether you need a single-storey extension, double-storey extension, rear extension, or side extension, we take pride in delivering high-quality workmanship on projects of all sizes. With extensive expertise in home extension construction, we build practical, stylish spaces designed to enhance your home and lifestyle. Trust Builders Alliance for reliable service, expert craftsmanship, and results that add lasting value to your property.
Different Variations of House Extensions
Double Storey Extensions: Double storey house extensions are an attractive and cost-effective way to maximise space and increase the value of your home. By extending both levels of your property, homeowners can significantly enhance functionality while making full use of the available footprint, without the stress of moving. With years of experience in residential construction and home extensions, Builders Alliance delivers reliable project management, expert craftsmanship, and seamless integration with your existing home — creating additional living space that is practical, stylish, and built to last.
Single Storey Extensions: We provide a wide range of single-storey house extensions designed to improve space, functionality, and comfort in your home. Whether you’re looking to expand a specific area or enhance overall layout, Builders Alliance delivers tailored solutions to suit your needs. Our services include bathroom extensions, garage extensions, kitchen extensions, and all types of smaller home extension projects. From planning through to completion, we ensure every build is completed to high standards and aligned with your expectations.
Enclosed Porch Extension: Adding an enclosed porch extension can bring style, sophistication, and practicality to your home while providing protection from the elements. A well-designed front porch extension not only enhances kerb appeal but also creates a useful buffer space that improves comfort and energy efficiency. Whether you’re looking to make a small hallway feel more spacious or your front door opens directly into your living room, a professionally built porch addition offers valuable extra room and functionality. At Builders Alliance, we design and construct high-quality porch extensions tailored to complement your property and meet your specific requirements.
Roof dormer: A highly effective way to maximise usable space in your home is by installing a dormer loft extension. If you’ve inherited a loft conversion but are unhappy with the limited full-height space, adding a box dormer can completely transform the functionality and comfort of your attic. At Builders Alliance, we bring extensive experience in loft conversions and dormer construction, delivering tailored solutions that meet structural requirements and UK building regulations while enhancing property value and usability.
Connect your home to your outhouse/Garage: Connecting your home to an outbuilding such as through a garage conversion— is an excellent way to maximise the space you already have. By integrating your garage or external structure with your main property, you can create a seamless, functional living area that enhances both comfort and value. A professionally completed garage conversion or linking extension adds versatility to your home, whether you’re looking to expand living space, create a home office, or improve access between buildings. This smart use of existing space avoids unnecessary expansion while delivering practical and cost-effective results.


Adding Value to Your Home No matter what type of home extension or conversion you choose, it can significantly increase your property’s value. Many homeowners invest in house extensions before selling, recognising it as a smart use of capital rather than an unnecessary expense. Creating additional living space makes a property more attractive to buyers and often results in a higher market price. At Builders Alliance, we have supported numerous clients in adding residential extensions that improve functionality while boosting overall property value. Extra space, improved layout, and modern design all contribute to making your home more desirable and practical.
Bespoke Designs Tailored to You and Your Family Every extension should serve a clear purpose — whether that’s accommodating a growing family, creating a home office, expanding existing rooms, or improving layout and comfort. That’s why we offer bespoke extension design and construction, tailored precisely to your needs. You tell us your vision, and we build it to specification, ensuring the final result reflects your lifestyle and priorities. From concept to completion, Builders Alliance delivers custom-built home extensions designed for long-term satisfaction and usability.
Saving You Time and Money Instead of saving for years and placing a deposit on a new property, many homeowners choose to transform their current home. Investing in a conversion or extension project can dramatically improve your living environment without the cost, stress, or disruption of moving. Enhancing your existing property allows you to allocate resources toward creating your ideal space while saving valuable time. With the right home extension builders, you can upgrade both the appearance and functionality of your home efficiently and cost-effectively.
A Simpler Alternative to Moving House One of the main reasons people extend their homes is the desire for change without relocation. After living in a property for many years, homeowners often feel ready for something new — but moving can be expensive and stressful. Builders Alliance frequently advises clients to consider a house extension before deciding to move. Extending your property is often more affordable and far less disruptive, allowing you and your family to enjoy a refreshed living environment without leaving your neighbourhood. In many cases, building an extension may fall under permitted development rights, meaning full planning permission might not be required. This can remove a major barrier that discourages homeowners from pursuing improvements. However, regulations vary, and compliance with local council planning rules and UK building regulations is essential. Builders Alliance helps guide clients through these requirements to ensure projects are completed legally and efficiently. If your extension meets the relevant guidelines, you can proceed with confidence.
No matter the size or complexity, we’re committed to delivering quality workmanship, reliable service, and results that add lasting value to your property. Contact Builders Alliance today to discuss your plans and take the first step towards creating the space you’ve been envisioning.





The bathroom should be a place to relax and unwind after a long day — so why settle for a space you don’t love? At Builders Alliance, we provide professional bathroom installation and bathroom fitting services in Blackburn, Lancashire and surrounding areas, helping homeowners create stylish, functional spaces tailored to their needs bathroom renovations.
We are very experienced when it comes to fitting new kitchens for our clients. As Blackburn builders, we have installed a range of different kitchens from luxury to modern and we deal with the whole process from start to finish. There are many different options to choose from, why not take a look at what’s on offer on our Kitchens page.

Our experienced team brings a strong work ethic and proven expertise to every project, delivering high-quality workmanship across a wide range of commercial refurbishment and building renovation projects throughout the UK. From structural improvements to full interior and exterior upgrades, we work closely with business owners to ensure projects are completed efficiently.

Your outdoor space plays an important role in enhancing kerb appeal and increasing property value. Whether you’re planning improvements or need a complete redesign, Builders Alliance manages landscaping projects across Lancashire with quality craftsmanship. Our experienced team delivers reliable landscaping services in Lancashire, helping homeowners transform their gardens into attractive Gardens
If your business premises need a fresh new look or your home is ready for an upgrade, Builders Alliance is here to help. We provide professional property renovation services in Blackburn, Lancashire and surrounding areas, delivering tailored solutions for both residential and commercial clients. We specialise in delivering bespoke renovation.

