Welcome to TRJ Construction Experts in Granny Annexes and Garden Rooms
Discover the ultimate in garden rooms, garden office spaces, and luxurious granny annexe designs.
Transform Your Garden into a Year-Round Oasis with TRJ Construction
Upgrade your Essex or Hertfordshire home with a luxury garden office or bespoke garden room designed for modern living. At TRJ Construction Ltd, we specialize in crafting insulated garden buildings that blend style, functionality, and energy efficiency. Whether you need a serene home gym, a vibrant playroom for kids, or a professional garden office in Essex, our team tailors every detail to your lifestyle.
Why Choose Our Garden Buildings?
✔️ Built to Last: Premium SIP panels and weather-resistant materials ensure durability in UK climates.
✔️ Year-Round Comfort: Advanced insulation and energy-efficient air conditioning systems maintain perfect temperatures, summer or winter.
✔️ Fast Installation: Your custom garden retreat is ready in just 3-6 weeks.
✔️ 10-Year Guarantee: Peace of mind with industry-leading structural warranties.
From bespoke granny annexes in Hertfordshire to custom garden offices, we combine cutting-edge design with sustainable practices. Our partnerships with leading UK air conditioning suppliers guarantee optimal climate control, making your garden room a practical extension of your home.
Ready to Elevate Your Outdoor Space?
Contact TRJ Construction today for a free consultation and discover how our award-winning garden rooms add value and functionality to your Essex or Hertfordshire property.
Luxury Garden Offices in Essex & Hertfordshire | TRJ Construction
Transform your backyard into a bespoke garden office retreat designed for productivity and comfort. Ideal for remote workers in Essex and Hertfordshire, our insulated garden rooms combine modern amenities with sleek aesthetics, offering:
✔️ Full Electrical Wiring & High-Speed Wi-Fi – Stay connected without interruptions.
✔️ Energy-Efficient Air Conditioning – Maintain perfect temperatures year-round.
✔️ Customizable Designs – Tailor layouts, finishes, and tech to match your workflow.
✔️ 10-Year Structural Guarantee – Built with premium SIP panels for UK weather resilience.
Why Choose TRJ Construction?
- Silent Workspace: Escape household noise in a serene, distraction-free garden office.
- Year-Round Comfort: Advanced insulation keeps your workspace warm in winter and cool in summer.
- Fast Installation: Your bespoke garden office in Hertfordshire is ready in 3-6 weeks.
As a leading air conditioning supplier in Essex, we equip every garden room with top-tier climate control systems, ensuring your workspace stays comfortable even during heatwaves or frost.
Ready to Redefine Your Work-Life Balance?
Get Your Free Garden Office Quote Today →
Bespoke Granny Annexe Solutions in Essex & Hertfordshire
At TRJ Construction Ltd, we design energy-efficient granny annexes that empower elderly relatives to live independently while staying close to family. Built with premium SIP panels for superior insulation and durability, our annexes combine the comfort of a traditional home with modern, low-maintenance living.
Why Families Choose Us:
✔️ Tailored Designs: Custom layouts with spacious living areas, ensuite bathrooms, and modern kitchens.
✔️ Year-Round Comfort: SIP panel insulation reduces energy costs by up to 40% and keeps interiors warm in winter, cool in summer.
✔️ Fast Build Times: Your annexe is ready in 6-8 weeks, with minimal disruption.
✔️ 10-Year Structural Guarantee: Built to last in Essex and Hertfordshire’s climate.
Features for Independent Living:
- Safety First: Non-slip flooring, wheelchair-friendly doorways, and emergency call systems.
- Luxury Touches: Underfloor heating, air conditioning, and high-speed Wi-Fi.
- Eco-Friendly: Solar panel-ready designs and energy-efficient lighting.
As Hertfordshire’s leading granny annexe specialists, we’ve helped families since 2012 create self-contained homes that blend seamlessly with gardens. Whether you need a cozy studio or a two-bedroom annexe, we work closely with you to deliver a space that feels like home.
Start Your Granny Annexe Journey Today:
Get a Free Quote for Your Essex/Hertfordshire Project →
Build Your Dream Garden Gym in Essex & Hertfordshire
Transform your backyard into a private fitness sanctuary with TRJ Construction’s bespoke garden gyms. Enjoy the convenience of a year-round home gym just steps from your door—no more commutes, crowded spaces, or membership fees.
Why Choose Our Garden Gyms?
✔️ All-Weather Training: Premium insulation and climate control for summer workouts or winter yoga.
✔️ Custom Designs: Tailor layouts for cardio zones, weightlifting, or holistic wellness studios.
✔️ Durable & Secure: Built with weatherproof SIP panels to withstand UK conditions.
✔️ Fast Installation: Your gym is ready in 4-6 weeks, backed by a 10-year structural guarantee.
Fresh Air Fitness, Rain or Shine
Our garden gyms blend the energy of outdoor workouts with indoor comfort. Imagine:
- Floor-to-ceiling windows for natural light and garden views.
- Built-in sound systems and high-speed Wi-Fi for virtual classes.
- Non-slip flooring, mirrored walls, and equipment-ready electrical outlets.
As Essex’s leading garden gym builders, we’ve helped homeowners since 2012 create spaces that inspire fitness goals. Whether you’re a HIIT enthusiast or a yoga devotee, we’ll craft a gym that fits your lifestyle.
Ready to Ditch the Gym Membership?
Claim Your Free Garden Gym Consultation Today →
Revolutionary SIP Panel House Extensions & Garden Offices in London
At TRJ Construction Ltd, we’re redefining London home renovations with our eco-friendly SIP panel system—a faster, greener alternative to traditional brick-and-mortar builds. Specializing in bespoke house extensions and luxury garden offices, we deliver energy-efficient spaces that slash heating bills by up to 50% and cut build times by 30%.
Why London Homeowners Choose SIP Panels:
✔️ Speed & Precision: Complete your extension or garden office in 6-8 weeks—minimizing disruption.
✔️ Energy Savings: Superior insulation outperforms brick builds, keeping homes warmer in winter and cooler in summer.
✔️ Building Regulation Compliant: All projects meet strict London planning and sustainability standards.
✔️ Custom Designs: From loft-style studios to garden offices with floor-to-ceiling glass, your vision drives our process.
Transform Your Property with:
- Seamless House Extensions: Add kitchens, guest suites, or home offices without the mess of traditional builds.
- Luxury Garden Workspaces: SIP panel studios with integrated Wi-Fi, climate control, and bespoke storage.
- Future-Ready Upgrades: Solar panel compatibility and EV charging points.
As London’s trusted SIP panel experts since 2012, we’ve crafted over 200 sustainable projects across Kensington, Camden, and Greater London. Whether you’re expanding a Victorian terrace or modernizing a suburban home, our team ensures flawless execution from design to handover.
Ready to Build Smarter?
Get Your Free London SIP Panel Consultation →
Design Your Ultimate Man Cave Retreat in London, Essex & Hertfordshire
At TRJ Construction Ltd, we transform underused garden spaces into luxury man caves—the perfect escape from high-pressure careers and daily stress. Whether you crave a gaming hub, sports lounge, or quiet workshop, our bespoke garden rooms offer a private sanctuary tailored to your hobbies and lifestyle.
Why Build a Man Cave with TRJ?
✔️ Stress-Free Design: From mood lighting to soundproofing, we create spaces that help you recharge.
✔️ Fast Installation: Your retreat is ready in 4-6 weeks, with minimal disruption to your home.
✔️ Premium Features: Include a bar, 4K home theater, or climate control for year-round comfort.
✔️ 10-Year Guarantee: Built with SIP panels to withstand UK weather and heavy use.
Turn Your Garden Into a Personal Oasis:
- Tech-Ready: High-speed Wi-Fi, smart lighting, and charging stations.
- Custom Themes: Rustic pub vibes, modern minimalist lounges, or industrial workshops.
- Guest-Ready: Impress friends with sleek finishes, outdoor seating access, and BBQ zones.
Forget the shed gathering dust in your garden. As London’s leading man cave builders, we’ve crafted over 150 personalized retreats since 2012, helping busy professionals unwind in style.
Ready to Escape the Daily Grind?
Claim Your Free Man Cave Design Quote →
Energy-Efficient SIP Panel Classrooms for Schools in London, Essex & Hertfordshire
At TRJ Construction Ltd, we specialize in durable, eco-friendly school classrooms built with cutting-edge Structural Insulated Panels (SIPs). Designed for modern education, our prefabricated classrooms slash construction timelines by 40% while reducing energy costs by up to 50%—freeing budgets for student resources.
Why Schools Choose SIP Panels:
✅ Rapid Installation: Prefabricated off-site and assembled in days, minimizing disruption to learning.
✅ Superior Insulation: Maintain consistent temperatures year-round—warm in winter, cool in summer.
✅ Cost Savings: 30% faster builds and 50% lower energy bills vs. traditional brick construction.
✅ Custom Designs: Flexible layouts for labs, libraries, or collaborative STEM spaces.
✅ 10-Year Structural Guarantee: Built to withstand daily wear-and-tear with fire-resistant SIP cores.
Key Benefits for Educators & Students:
- Healthier Learning: Improved air quality with moisture-resistant materials.
- Noise Reduction: Soundproofing for focused classrooms.
- Eco-Credentials: Ideal for schools targeting Net Zero or Eco-Schools certifications.
- Future-Proof: Easy expansion for growing student numbers.
As London’s trusted SIP panel specialists, we’ve delivered over 75 energy-efficient educational spaces since 2012, including projects for primary schools in Essex and colleges in Hertfordshire. Our compliance with UK building regulations ensures safe, accessible spaces that inspire learning.
Ready to Upgrade Your School’s Infrastructure?
Book a Free SIP Classroom Consultation →
Creating stands for exhibitions can be a great way to showcase products or services and attract potential customers. There are many different types of stands that can be used, depending on the size and type of exhibition, as well as the budget and objectives of the company or organization.
Custom-built stands: These are unique, one-of-a-kind stands that are designed specifically for a particular exhibition or event. They can be made of a variety of materials and can include a range of features, from built-in screens and sound systems to interactive displays and virtual reality experiences.
During the years we done buildings for stands at Excell London 2012 ,2013 ,2014 ,2015 and NEC Birmingham Grand Design .
Innovative SIP Panel Commercial Construction: The Royal College of Art Battersea Case Study
TRJ Construction Ltd partnered with Dr. William Hogan-O’Neill, RIBA-accredited architect, to deliver the groundbreaking Royal College of Art Battersea annexe—a flagship example of SIP panels in commercial construction. Completed in 2017 using premium SIPs supplied by SuperSIPS UK, this project showcases how eco-friendly, high-performance materials redefine academic and commercial spaces.
Why SIP Panels Excel in Commercial Projects
✅ Speed & Precision: 30% faster construction vs. traditional methods, minimizing campus disruption.
✅ Energy Efficiency: 40% lower heating/cooling costs with superior insulation for large-scale buildings.
✅ Design Flexibility: Customizable layouts for labs, studios, or collaborative workspaces.
✅ Durability: Fire-resistant SIP cores meet stringent UK commercial safety standards.
Key Features of the RCA Battersea Project
- Sustainable Design: Reduced carbon footprint with SIP panels, aligning with RCA’s environmental goals.
- Architectural Collaboration: Worked closely with Dr. Hogan-O’Neill to blend cutting-edge aesthetics with functionality.
- Future-Proof Infrastructure: Scalable for expansions or tech upgrades.
As London’s trusted SIP panel contractors, TRJ Construction specializes in commercial and academic builds across Essex, Hertfordshire, and Greater London. From university annexes to corporate offices, our SIP solutions offer cost-effective, eco-conscious alternatives to steel-and-concrete construction.
Inspired by the RCA Project?
Book a Free Consultation for Your Commercial SIP Build →
Bespoke Kitchen Design & Installation in Essex & Hertfordshire
At TRJ Construction Ltd, we craft luxury, functional kitchens that blend style with practicality for homeowners in Essex and Hertfordshire. Whether you’re renovating a period property in Chelmsford or modernizing a suburban home in Harlow, our team delivers custom solutions that elevate your space and property value.
Why Choose TRJ for Your Kitchen?
✅ Tailored Designs: Collaborate with our award-winning designers to create layouts for gourmet cooking, family gatherings, or compact urban spaces.
✅ Premium Materials: Quartz countertops, hardwood cabinetry, and energy-efficient appliances from trusted UK suppliers.
✅ Fast, Stress-Free Installation: Completed in 2-4 weeks with minimal disruption.
✅ Craftsmanship Guarantee: Built to last with precision and care.
Transform Your Kitchen with:
- Smart Storage Solutions: Pull-out pantries, hidden drawers, and bespoke island units.
- Eco-Friendly Upgrades: LED lighting, recycled materials, and water-saving fixtures.
- Tech Integration: Underfloor heating, smart appliance hubs, and USB charging stations.
As Hertfordshire’s leading kitchen specialists, we’ve designed over 300 kitchens since 2012, earning a 98% client satisfaction rate. From farmhouse chic in Bishop’s Stortford to minimalist designs in Watford, we turn visions into reality.
Ready to Create Your Dream Kitchen?
Book Your Free Kitchen Design Consultation Today →
Luxury Bathroom Design & Installation in Essex & Hertfordshire
At TRJ Construction Ltd, we create bespoke bathrooms that blend elegance, functionality, and innovation for homeowners in Essex and Hertfordshire. Whether you’re renovating a Georgian townhouse in Chelmsford or modernizing a family home in Watford, our team delivers tailored solutions that exceed expectations.
Why Choose TRJ for Your Bathroom?
✅ Custom Designs: Spa-like retreats, wet rooms, or accessible bathrooms for all life stages.
✅ Premium Quality: Porcelain tiles, thermostatic showers, and underfloor heating from trusted UK suppliers.
✅ Stress-Free Installation: Completed in 2-4 weeks with minimal disruption.
✅ Workmanship Guarantee: Built to last with precision and care.
Transform Your Bathroom with:
- Smart Features: Voice-controlled lighting, anti-fog mirrors, and leak-detection systems.
- Eco-Upgrades: Water-saving fixtures, recycled tiles, and energy-efficient heated towel rails.
- Accessibility: Future-proof designs with walk-in showers and grab rails.
As Hertfordshire’s leading bathroom specialists, we’ve designed over 250 bathrooms since 2012, earning a 100% client satisfaction rate. From minimalist en-suites in St Albans to Victorian-inspired baths in Epping, we turn your vision into reality.
Ready to Upgrade Your Bathroom?
Claim Your Free Bathroom Design Consultation →
Custom Garden Playrooms & Music Studios in Essex & Hertfordshire
Transform your garden into a safe, imaginative space for kids and musicians with TRJ Construction’s bespoke playrooms and soundproof music studios. Perfect for families in Essex and Hertfordshire, our designs keep children entertained while protecting your home’s floors and sanity.
Why Families Love Our Playrooms:
✅ Kid-Proof Flooring: Choose from scratch-resistant laminate, soft rubber, or eco-engineered wood.
✅ Safety First: Non-toxic materials, rounded edges, and optional child-safe sinks/toilets.
✅ Parent-Friendly: Durable walls and soundproofing for peace (or practice sessions!).
✅ Fast Installation: Ready in 3-5 weeks with a 10-year structural guarantee.
Create Their Dream Space:
- Music Studios: Soundproofed walls, built-in storage for instruments, and mood lighting.
- Playroom Add-Ons: Climbing walls, chalkboard panels, or themed decor (pirate ships, princess castles!).
- Tech-Ready: Wi-Fi hubs and charging stations for older kids.
For Busy Parents in Essex & Hertfordshire:
Tired of toys overtaking your living room? Our garden playrooms offer a clutter-free zone where kids can play freely while staying safely within sight. Whether you’re in Chelmsford, Harlow, or St Albans, we design spaces that grow with your family.
Ready to Reclaim Your Home?
Book Your Free Design Consultation →
NEW GARDEN ROOMS MODELS
M007 Garden Room
A garden room with a trapeze entrance could be a unique and playful addition to your outdoor space. It could be designed in a variety of ways depending on your preferences and needs.
If you're feeling more ambitious, you could have the trapeze entrance be part of the garden room structure itself.
D007 Garden Room
A garden room with an angled wall can create a striking visual effect and add a sense of uniqueness to your outdoor space.
Create a modern look with a sleek design: An angled wall can create a modern and sophisticated look.
T007 Garden Room
A garden room with a rest canopy and decking area can provide a tranquil and comfortable outdoor living space for you and your family.
Choose comfortable outdoor furniture to create a relaxing seating area under the rest canopy. Consider adding cushions, throws, and outdoor rugs for added comfort.
S007 Garden Room
A garden studio with recessed windows and doors can create a unique and stylish space that blends seamlessly with the natural surroundings.
Recessed windows can create a sleek and modern look, but they can also provide an opportunity to let in plenty of natural light. Consider installing large windows to maximize the amount of natural light in your garden studio.
O007 Garden Room
An office garden room with large windows can create a bright and inviting workspace that allows you to connect with nature and work in a peaceful environment.
Large windows allow plenty of natural light to flood into the room. Consider positioning your desk near the windows to take advantage of the natural light and provide a view of the outdoor space.
5 Reasons to choose TRJ Construction Ltd
TRJ Construction Ltd | Premier Construction Company in Hertfordshire
Building Excellence Since [2012
Looking for a trusted construction company in [Location] that delivers high-quality, customized building solutions? TRJ Construction Ltd combines decades of experience, unmatched craftsmanship, and a client-first approach to bring your vision to life. Here’s why we’re the top choice for residential and commercial projects:
1. Experienced Construction Contractors You Can Trust
With over [X] years in the construction industry, TRJ Construction Ltd has honed the expertise to tackle complex projects, from home renovations to commercial builds. Our seasoned team ensures your project adheres to local building codes, timelines, and budgets—guaranteeing results that stand the test of time.
2. Skilled Architects, Builders & Project Managers
Our team of licensed architects, certified builders, and detail-oriented project managers collaborates seamlessly to deliver precision at every stage. Specializing in custom home construction, kitchen/bath remodels, and commercial renovations, we blend innovation with proven techniques for flawless execution.
3. Bespoke Construction Solutions Tailored to You
No two projects are alike. That’s why we prioritize personalized service, working closely with you to design spaces that reflect your lifestyle or business needs. Explore our portfolio of custom home designs or commercial projects to see how we turn ideas into reality.
4. Premium Materials & Rigorous Quality Control
Quality is non-negotiable. We source durable, eco-friendly materials from trusted suppliers and implement multi-stage inspections to ensure every detail—from foundation to finishes—meets our strict standards. Learn more about our construction quality promise.
5. Dedicated Customer Service & Transparent Communication
From initial consultation to project completion, we keep you informed with regular updates and 24/7 support. Our 5-star client testimonials highlight our commitment to stress-free experiences and lasting relationships.
Why Choose TRJ Construction Ltd?
✅ Hertfordshire-Based Licensed & Insured Contractors
✅ Free Consultations & Competitive Pricing
✅ 100% Satisfaction Guarantee
Ready to Build with Confidence?
📞 Call 07966800519 for a free project estimate
📧 Email costi@trj-construction.co.uk to discuss your vision
📍 Serving Hertfordshire ,Essex and Surrounding Areas
FAQ
Q: Do you offer eco-friendly building options?
A: Yes! Ask us about energy-efficient materials and sustainable design practices.
Q: How long does a custom home build take?
A: Timelines vary, but we provide clear schedules upfront and update you weekly.
TRJ Construction Ltd – Where Vision Meets Precision
🔗 Explore our services | 📸 View our gallery | 📝 Read client success stories
Premium Modular Garden Rooms, Offices & Granny Annexes – Expand Your Living Space
Upgrade your home with our modern and contemporary modular garden rooms, garden offices, and granny annexes, designed to exceed standard building regulations. Our high-quality garden buildings provide a fast and hassle-free way to expand your living space while boosting your property value. Installed with minimal disruption and often no planning permission required, they offer the perfect solution for homeowners looking to maximize their outdoor space.
Bespoke Garden Buildings for Every Need
From stylish
garden offices to functional
granny annexes, our extensive range of
custom-built garden structures includes:
✅
Home offices – Work from home in a quiet, professional space
✅
Garden gyms – Stay fit without leaving your property
✅
Guest rooms – Perfect for visitors or Airbnb rentals
✅
Workshops & Studios – Ideal for creatives, DIYers, and professionals
✅
Outdoor entertainment areas – Barbecue spaces, sun lounges, patios, pergolas & more
With a variety of designs, including lodges, barns, sheds, garages, playrooms, saunas, pool houses, summerhouses, and log cabins, we can create a garden building tailored to your needs.
The Benefits of a Garden Office
With remote work on the rise, a dedicated garden office offers the perfect balance between work and home life. Avoid distractions, cut commuting costs, and enjoy a private workspace just steps from your back door.
Explore our range of custom garden buildings today and transform your outdoor space with a stylish, practical, and durable solution!
Creating extra room in your garden Hertfordshire Garden Rooms
TRJ Construction Ltd – Specialists in Bespoke Modular Garden Buildings
At TRJ Construction Ltd, we design, construct, and install stunning modular garden buildings tailored to your needs. Our high-quality modular living spaces can be transformed into granny flats, art studios, home gyms, garden offices, music rooms, guest suites, and even rental units for additional income.
Customizable Outdoor Room Solutions
Explore our extensive range of outdoor modular buildings, available in various designs and fully customizable to suit your space, style, and budget. Whether you're looking for a quiet workspace, a creative studio, a private guest house, or a functional home extension, our modular buildings offer a versatile and cost-effective solution.
Garden rooms built to last Watford Granny Annexe
Fast & High-Quality Garden Room Installation by TRJ Construction Ltd
At TRJ Construction Ltd, we make expanding your living space easy and hassle-free. Simply choose your preferred garden room design and finishes, and we’ll have your new space installed and ready to use in just 3-6 weeks—depending on the size and complexity of the project.
Built to Last – Designed for UK Weather
✔ Premium-Quality Materials – Durable, weather-resistant, and long-lasting
✔ Fully Insulated & UK-Made – Comfortable year-round use
✔ 10-Year Structural Guarantee – Peace of mind with every build
Our expertly crafted modular garden rooms offer a stylish and practical solution for home offices, gyms, studios, guest rooms, and more. Get in touch today to start designing your perfect outdoor space!
Your experts on SIP panels construction .
Turnkey Solutions
Custom Designs
Business Hours
- Mon - Fri
- -
- Saturday
- -
- Sunday
- Closed
About Us
We are one of the most experienced builder of granny annexe homes and garden rooms in the area. With nearly 20 years of experience, we have built our reputation on doing exactly what we say, when we say. We communicate clearly with our clients, and work quickly and efficiently to build them a space that works for them. We’re proud to put our name to our garden rooms, thanks to the skill and craftsmanship of our team.
You’ll find us to be approachable, honest, and easy to deal with. We are not inclined to make promises we can’t keep either. As we said before, what you see is what you get when you work with us. We pride ourselves on the great customer service that we offer, and we are there for our clients every step of the way.
A Great Value Service From Our Building Contractors
You will also discover that we offer a very high quality product, with top levels of workmanship on and off site. This all comes at a very attractive price. Our services are great value for money, and you will have a space that you can enjoy for many years to come. We’ll give you a full, detailed quote before we start the work, and there are no hidden costs for you to worry about further down the line.
When we build a granny annexe or garden room, we always consider your needs. All of our structures are built to meet a client’s exact specifications, and we will take your taste, budget, and requirements into consideration throughout the design and building process. So you will end up with a space that is the perfect addition to your home.
Call TRJ Construction Ltd for the best deal on the market
We have a wealth of expertise in the industry, working as the main contractor of GARDENSPACES UK for some time. We specialise in the design and construction of garden houses, home offices, and granny annexes . We don’t just build these though! Our advanced building contractors have extensive experience when it comes to extensions, loft conversions, electrical installations, plumbing, carpentry and much more. If you want to find out more about our building contractors and the services that they provide in Essex and London, then please get in touch with us today.
Testimonials
Jessica Tenner
The gym looks absolutely amazing! It all went so smoothly and the guys were an absolute delight to have around.
Hannaford
I'm delighted with my studio! Many thanks for your invaluable input. Costi and his team have been great.
Where to find us:
Rushleigh Avenue, Waltham Cross, EN8 8PP, UNITED KINGDOM
Online Appointment
About Us
Established in 2012, TRJ Construction Limited is one of the UK’s leading full-service design-build firms, specializing in the construction of low-cost, energy-efficient garden buildings for residential and commercial use.
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