TRJ CONSTRUCTION · PROJECT PORTFOLIO
Cedar Garden Studio in Brentwood
A 7.3 × 4 m cedar-clad SIP garden room in Brentwood, with concealed storage, aluminium sliding doors, composite decking and LG heating and cooling.
THE PROJECT
From an idea
to a real space.
A 7.3 × 4 m cedar-clad SIP garden room in Brentwood, with concealed storage, aluminium sliding doors, composite decking and LG heating and cooling.
TRJ Construction built this garden room in Brentwood, Essex for Su Lin, combining a finished main room with a separate storage compartment behind a concealed external door. Composite decking connects the building to the garden, with a further deck platform by the house.
Size and hidden storage
The building measures 7.3 × 4 m externally, an overall footprint of 29.2 m². The internal storage room is approximately 2 m wide and retains an OSB finish. Its solid external door is clad to blend into the frontage, keeping access discreet.
SIP structure and foundations
SIP panels form the floor, walls and roof. The order specifies screw-pile foundations, with standard 1,250 mm piles and selected rear piles upgraded to 1,500 mm in the detailed specification. The existing concrete base was retained as part of the agreed site preparation, with the old shed removed.
Cedar, glazing and roof
Vertical Red Cedar cladding and a front canopy define the main elevation. Fire-retardant boards with a silicone rendered finish cover the sides and rear. Anthracite grey aluminium sliding doors measure 4,000 × 2,030 mm, with three panes, toughened glass and argon-filled glazing. An EPDM roof covering and black round guttering complete the exterior.
Interior, power and climate control
The main room is plasterboarded, skimmed and painted white with Dulux paint, with Howdens laminate flooring and white skirting. A 2.5 kW Wi-Fi-enabled LG inverter air conditioning unit provides heating and cooling.
The electrical specification includes seven double sockets, eight internal downlights, five exterior downlights and a surface-mounted LED light in the storage room. Standard white fittings and an independent consumer unit with RCBO and surge protection were included. The cable route runs beneath the decking and neatly alongside the fence.
Composite decking and additional work
The order specifies a front deck approximately 7.9 m wide × 1 m deep, a 600 mm deck return at the side and a further 6 × 4 m platform at the rear of the house. Su Lin’s review also records TRJ fitting out the utility room as part of the wider work.
CUSTOMER REVIEW · 5 STARS
Brilliant craftsmanship!
“Costi and his team built a garden room at the back of our garden, put down some composite decking and fitted out our utility room. They were brilliant from start to finish - Costi provided a very detailed quote, was very responsive and helpful and the team completed the job efficiently and with no fuss (and cleaned up thoroughly after the job was completed). The workmanship was excellent and we would not hesitate to recommend Costi and his team to anyone looking for professional builders.”
Su Lin Khor · ★★★★★ · 1 January 2026
REAL PROJECT PHOTOGRAPHS
A closer look
at the build.
Explore photographs from this project using the rotating gallery. Use the arrows or pause the movement to study each view.
View the full photograph collection ↓Photograph 1 of 4 · Project photograph 1
THE PHOTOGRAPH COLLECTION
Details worth
a closer look.
Photographs recorded for this project. They may show different stages and views; the gallery is not a promise of a standard package.
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YOUR NEXT PROJECT
Start with
your own brief.
Tell us how you want to use the space, where it will be built and which details you like from this project. We can discuss a layout and specification suited to your property.
Access, ground conditions, services, planning and building control requirements need to be assessed for your site. Dimensions, prices and timescales are agreed for the individual project.
