Pioneering SIP Panels Technology in Garden Rooms, Granny Annexes, and Home Extensions

Constantin Tiseanu • 2 March 2024

The use of SIP (Structural Insulated Panels) panels contributes significantly to energy efficiency and reduced heating or cooling costs 

SIP Panel Construction Experts: Garden Rooms, Granny Annexes & Home Extensions by TRJ Construction Ltd

TRJ Construction Ltd is a trusted UK-based construction company with over 20 years of expertise in SIP (Structural Insulated Panel) design and construction. Specialising in modern Garden Rooms, Granny Annexes, and Home Extensions, TRJ Construction is transforming residential living with innovative, energy-efficient building solutions.

If you're looking to expand your home with a high-performance, eco-friendly living space, SIP technology offers unmatched benefits — and TRJ Construction Ltd leads the way in its design, fabrication, and installation.

What Are SIP Panels?

Structural Insulated Panels (SIPs) are advanced building components made of a high-performance insulating foam core sandwiched between two structural boards (typically OSB). This structure creates a strong, airtight, and highly insulated building envelope that outperforms traditional brick-and-block construction in energy efficiency and speed of build.

Why SIP Panel Construction Is the Future of Home Expansion

✅ Superior Energy Efficiency

SIP panels deliver outstanding U-values, which means reduced heat loss and lower energy consumption year-round. For homeowners, this translates to:

  • Lower utility bills
  • Improved interior comfort
  • A reduced carbon footprint

✅ Fast & Efficient Installation

SIP buildings can be constructed faster than traditional builds due to their precision manufacturing and modular design. This means:

  • Minimal disruption to your home life
  • Faster project timelines
  • Lower labour costs

✅ Fully Customisable Designs

TRJ Construction offers bespoke SIP panel solutions tailored to your property and preferences. Whether you’re building a home office, hobby room, self-contained annexe, or guest suite, we provide:

  • Full design-to-completion services
  • Multiple layout options
  • Planning assistance and building compliance

SIP Panel Applications by TRJ Construction

🌿 Garden Rooms

Perfect for home offices, studios, or leisure spaces, our SIP garden rooms are:

  • Insulated for year-round use
  • Fully wired and heated
  • Custom-finished to match your home's style

👵 Granny Annexes

Support multi-generational living with a fully self-contained annexe featuring:

  • Kitchenette and shower room
  • Private living and sleeping area
  • Energy-efficient construction and soundproofing

🏠 Home Extensions

Expand your property with minimal disruption using SIP panels:

  • Rapid build time
  • Seamless integration with existing architecture
  • Choice of cladding: timber, render, brickwork, and more

Premium Features & Finishes

Every SIP build by TRJ Construction includes the option to add:

  • Electrical wiring and lighting
  • Air conditioning units
  • Skylights and large windows
  • Fully equipped kitchenettes and bathrooms
  • Custom interior and exterior finishes

Whether you want a contemporary timber-clad design or a traditional brick exterior, we match your vision.

Boost Property Value & Future-Proof Your Home

Investing in a SIP Garden Room, Granny Annexe, or Extension is more than just adding space — it adds significant market value, enhances lifestyle, and offers rental or resale potential. It’s an ideal solution for:

  • Growing families
  • Ageing relatives
  • Home-based businesses
  • Airbnb or short-term rental income

Why Choose TRJ Construction Ltd?

With a legacy of excellence in SIP construction, TRJ Construction Ltd offers:

  • Over 20 years of hands-on experience
  • Expert consultation, design, and full project management
  • Unwavering attention to detail aand client satisfaction

Start Your SIP Panel Project Today

Ready to enhance your home with an energy-efficient, custom-built SIP living space? Contact TRJ Construction Ltd for a free consultation and discover why we’re one of the UK’s leading SIP construction specialists.

📞 Get in touch now to discuss your Garden Room, Annexe, or Extension project.

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In recent years, garden rooms have exploded in popularity — from stylish home offices to peaceful yoga studios or even cozy guest spaces. But did you know that new electric regulations introduced this year could impact your garden room setup? Garden rooms are no longer just storage sheds — they’ve become home offices, hobby studios, gyms, and even guest suites. But here’s something many homeowners overlook: 👉 Are your garden room electrics up to the latest standards? With the introduction of the 2025 electrical regulations update (based on the 18th Edition Wiring Regulations Amendment 3), there’s more focus than ever on making sure outdoor structures like garden rooms are safe, efficient, and compliant. In this post, we break down why it matters and what you can do to stay protected. 🔌 What Are the New Electrical Regulations? The latest UK electrical rules tighten safety measures for: ✅ Correct outdoor cabling (such as SWA — steel-wired armored) ✅ Circuit protection with RCDs or RCBOs to prevent shocks ✅ Proper earthing and bonding for separate garden buildings ✅ Certification under Part P of Building Regulations The goal is simple: to reduce risks of fire, shock, or system failure, especially in outdoor settings where exposure to weather, moisture, and fluctuating loads are common. 🌱 Why Your Garden Room Needs to Comply Even if your garden room was installed just a few years ago, it may not meet today’s standards. Here’s why compliance matters: ⚠ Insurance risks — Non-compliant electrics can invalidate your home insurance in case of fire or accidents. ⚠ Safety hazards — Faulty or overloaded circuits can cause electric shocks or fires, putting your family at risk. ⚠ Resale value — When you sell your home, electrical certificates are essential for legal compliance and buyer confidence. 🔧 What Should You Do Next? Here’s how to ensure your garden room is up to code: ✅ Book an electrical inspection — Have a qualified, registered electrician check your setup. ✅ Upgrade if needed — If your circuits, cabling, or sockets fall short, invest in an upgrade for safety and peace of mind. ✅ Get certified — Make sure all work is properly signed off and you receive the necessary Part P certification. ✅ Future-proof — If you plan to add heaters, lighting, or tech, make sure your electrical system can handle the extra load. 🌟 Don’t Wait — Protect Your Garden Room Today Your garden room is more than just a backyard building — it’s an extension of your home and lifestyle. Staying up to date with the latest electrical regulations isn’t just a legal requirement — it’s about keeping your space safe, insurable, and ready for the future. 👉 Ready for a garden room safety check? Contact our trusted electricians today for a no-obligation inspection and get peace of mind knowing your garden space is fully compliant. 📞 Call us at 07966800519 📧 Email us at costi@trj-construction.co.uk 🌐 Visit www.trj-construction.co.uk to book online
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At TRJ Construction Ltd, we take pride in turning our clients’ visions into reality, no matter how complex the project. One of our recent builds presented a unique challenge—there was no direct access to the garden through the house, making a traditional installation impossible. But challenges like these don’t stop us. Instead, they push us to find innovative solutions. Our team, led by Costi, carefully planned and executed the project by craning the entire structure over the house. This required meticulous coordination, precision, and problem-solving to ensure a seamless and safe installation. Despite external factors, such as rising transport costs, we remained committed to our original quote, ensuring transparency and trust with our client. From start to finish, our focus was on delivering exceptional craftsmanship and high-quality materials to create a stunning, fully functional garden room. We paid close attention to every detail, ensuring the finishing touches matched the client’s expectations. The result? A beautiful, modern garden room that exceeded all expectations. Our client was thrilled with the final outcome and shared their appreciation for our hard work, diligence, and dedication to quality: "Costi and his team have done an incredible job at making our garden room vision a reality. Throughout the process, Costi has been very meticulous, hard-working, diligent, and prompt. He had solutions for every construction challenge and delivered a very high-quality garden room which we really love. I was impressed by how Costi remained committed to the original quote despite transport costs going up. He went above and beyond to make sure that the finishing materials I wanted were used and that the workmanship was high quality. I would not hesitate to recommend TRJ for any garden room or annex project." At TRJ Construction Ltd, we believe that every project is an opportunity to create a beautiful and functional space for our clients, regardless of the challenges we face. Whether it’s a garden gym, home office, or guest annex, we bring experience, expertise, and dedication to every build. 📍 Location: Just outside Central London 📞 Get in touch today for a free consultation and let’s create your dream space! #GardenRoom #HomeGym #OutdoorLiving #ExpertCraftsmanship #TRJConstruction #LondonHomes
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