Expert Home Extensions and Knock-Through Services
When you outgrow your home but love where you live, a home extension is the perfect way to create more space and add real value to your property. At Andy Board Building & Joinery, we specialise in home extensions and knock-through projects that transform how you live — combining practical design with superior workmanship. Whether you’re expanding your kitchen, creating an open-plan living area, or adding a new room altogether, we deliver exceptional results with attention to every detail.
Consultation & Quote
We’ll visit your home, discuss your vision, and provide a free, no-obligation quotation.
Design & Planning – We help you finalise the layout, materials, and finishes to ensure everything fits perfectly.
Preparation
Old fittings are removed safely and cleanly, and the space is prepared for your new installation.
Installation – Our skilled team carries out the plumbing, joinery, tiling, building and electrical work with precision.
Finishing Touches
We take care of the final details — sealing, painting, cleaning — to leave you with a perfect finish.
You’ll have a single point of contact throughout, and we’ll keep you informed at every step.
Free Quotes
Andy Board Building & Joinery for bespoke Bathroom fitting experts.
Built to Last
Home Extensions
Years of experience in home renovations
Knock Throughs
Skilled in all aspects of wall removals
Local to Grimsby
Over 30 years experience in the building & Joinery trade.
Home Extensions & Knock Through Services
Adding Real Value to Your Property
A well-built home extension doesn’t just improve your day-to-day life — it can also add significant value to your property. Open-plan living, additional bedrooms, home offices, and larger kitchens
Smaller Projects
Converting a garage or knocking through two rooms, can have a huge impact on how your home looks and feels. We’ll always discuss your goals and budget, ensuring you get the best possible return on your investment.
Full Project Management
This all-in-one service saves you time, money, and stress. Our goal is simple: to make your home extension project as smooth and straightforward as possible while delivering a space you’ll love for years to come.
A Complete Building Service from Start to Finish
At Andy Board Building & Joinery, we take a full-service approach to every project. That means you don’t need to coordinate multiple trades or worry about different contractors working at different times. Our team includes skilled builders, joiners, electricians, plumbers, plasterers, and tilers, all working together to deliver a seamless, high-quality finish.
From the moment we begin, we handle every stage of your home extension or knock-through project, including:
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Design and planning assistance
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Building regulations compliance
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Structural calculations and steel installation
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Brickwork, joinery, and roofing
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Plumbing and electrical work
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Plastering, flooring, and finishing touches
This all-in-one service saves you time, money, and stress. Our goal is simple: to make your home extension project as smooth and straightforward as possible while delivering a space you’ll love for years to come.
Knock-Throughs: Opening Up Your Living Space
Alongside full extensions, we’re experts in knock-throughs — removing internal walls to open up living areas, improve natural light, and create a modern, spacious feel. Our team handles all aspects of the structural work, including steel beam installation (RSJs), ensuring your home remains safe, secure, and compliant with building regulations.
Many older homes were designed with separate, smaller rooms. By knocking through walls between the kitchen, dining, and living areas, we can create one large open-plan space that feels brand new. These projects are among the most effective ways to modernise a property and improve its flow without changing the footprint of your home.
Every knock-through requires care and precision. We work closely with building inspectors and structural engineers to make sure all supporting work is completed to the highest standard. From temporary support props and beam fitting to plastering, finishing, and decorating, everything is taken care of under one roof.
Andy Board Home Extensions & Knock Through Works
Transforming Homes with Smart, Functional Extensions
Our home extension services are designed to help homeowners maximise their existing space without the stress of moving. From the initial design and planning stages right through to the final finishing touches, our team ensures every step runs smoothly. We take pride in offering a complete service — managing every trade, coordinating schedules, and maintaining high-quality standards throughout.
A well-designed home extension doesn’t just add square footage — it enhances how your home feels and functions. We work closely with you to understand your goals and create a layout that fits seamlessly with your existing property. Whether you’re looking for a rear extension, side extension, or double-storey extension, we can guide you through the best structural and design options to suit your budget and lifestyle.
Why Choose Our Services
Local & Trusted
Proudly serving Grimsby and surrounding areas with quality workmanship.
Fully Managed Projects
We handle everything from design to fitting and finishing.
Experienced Team
Years of experience across bathrooms, joinery, and building.
Attention to Detail
Every cut, joint, and finish is completed to the highest standard.
Experience and reliability: With years of hands-on experience, we’ve completed countless extensions and structural projects across the region.
All trades covered: From design to decoration, everything is handled in-house by trusted professionals.
Attention to detail: We take pride in neat, precise workmanship from the foundations to the final finish.
Transparent communication: You’ll always know what’s happening, when, and why.
Fully insured and compliant: All work is completed to meet current building regulations and safety standards.
Your home deserves the best. We take the time to understand your vision and deliver a finished result that exceeds expectations.
Contact the Leading Builders in Grimsby
Get in touch with Andy Board Building & Joinery for a no-obligation quote
and professional advice on your home extension or knock-through project.
Frequently Asked Question
Ready to get started?
Contact Andy Board Building & Joinery — your trusted craftsmanship and professional service.
How long does a home extension take?
Every project is different, but most single-storey extensions take around 5–10 weeks from start to finish, depending on complexity and weather conditions.
Do I need planning permission for an extension?
Many extensions fall under permitted development, but we’ll advise you based on your property and handle all required approvals if necessary.
What is a knock-through?
A knock-through involves removing a wall (often load-bearing) to combine two rooms into one larger space. It’s ideal for creating open-plan kitchens or living areas.
Can you manage the full project?
Absolutely. We provide complete project management, handling all trades and ensuring your project runs smoothly from start to finish.