Bespoke SIP Garden Gym
A high-performance garden gym with SIP construction, large glazing, premium finishes and year-round comfort.
See More Details
BESPOKE ESSEX GARDEN ROOMS
TRJ Construction Ltd
Project Showcase
Bespoke SIP garden rooms and granny annexes designed around performance, comfort and year-round use.
SIP Garden Room With Shower Room
A fully insulated SIP garden room with shower room provision, rendered finish, deep screw pile foundations and planning support.
See More Details
Large SIP Garden Room With Storage
A large SIP garden building with separate storage, Thermowood-style frontage, full electrics and future-ready services.
See More Details
Turnkey SIP Granny Annexe
A complete independent living space with bedroom, bathroom, kitchen, planning support and high-performance SIP construction.
See More Details
SIP Garden Rooms
Bespoke Garden Rooms Built for Year-Round Use
We design and build high-performance SIP garden rooms for offices, gyms, studios and family spaces. Fully insulated, professionally finished and designed around your property.
Read More
Granny Annexes
Independent Living Space, Built Properly
Our SIP granny annexes can include bedrooms, bathrooms, kitchens and open-plan living areas, with planning support and a complete turnkey construction service.
Explore Annexes
Planning & Build
From Design to Completion
TRJ Construction can help with planning, foundations, SIP structure, exterior finishes, electrics, heating, bathrooms and final decoration.
Request a Quote TRJ Construction Ltd
Frequently Asked Questions
Clear answers about SIP granny annexes, garden rooms, planning, foundations and turnkey construction.
Overview
A SIP garden room is built using structural insulated panels, creating a strong, highly insulated building envelope. Compared with basic timber-framed garden rooms, SIP construction gives better thermal performance, excellent rigidity and a more engineered feel for year-round use.
Granny Annexes
Yes. TRJ Construction can design and build SIP granny annexes with bedrooms, bathrooms, shower rooms, kitchens, open-plan living areas, heating, electrics and full internal decoration. We can also help with planning and building control requirements where needed.
Planning Support
Some garden rooms can fall under permitted development, but granny annexes and buildings with sleeping accommodation, kitchens or bathrooms often need a more careful planning approach. We can review the site, explain the likely route and help prepare the information required for the application.
Foundations
For many SIP garden rooms and annexes, screw piles are a practical foundation option because they are fast, clean and reduce excavation. Ground conditions always matter, so other options such as slabs, pads or deeper engineered foundations can be used where the site requires them.
Year-Round Comfort
Yes. SIP buildings are designed around insulation, airtightness and comfort. With the correct roof, floor and wall build-up, plus good glazing, ventilation and optional air conditioning or heating, the space can feel comfortable through winter and summer.
Turnkey Delivery
Yes. TRJ Construction can manage the project from design and planning support through to foundations, SIP structure, exterior finishes, electrics, plumbing, bathroom or kitchen fit-out and final decoration. The aim is to deliver a complete, usable building rather than just a shell.
Get to know us better by taking a look at some of our pictures.trj construction n london.
Contemporary garden rooms ,bespoke garden rooms and fully insulated garden buildings for your needs .
