Bespoke Garden Gym in Bishop’s Stortford

Bespoke SIP Garden Room by TRJ Construction

A fully bespoke garden gym in Bishop’s Stortford, designed, engineered and built using high-performance SIP construction. This project showcases what a modern garden room can truly become—a premium, all-year-round fitness space, combining structural performance, smart technology, and high-end finishes.

This bespoke garden gym in Bishop’s Stortford was designed and built using high-performance SIP panels, delivering a fully insulated, all-year-round fitness space. Featuring aluminium bifold doors, full mirror walls, smart LED lighting, and integrated air conditioning, this project demonstrates how a garden room can be transformed into a premium lifestyle extension.

Built using 150mm SIP panels for the roof and floor and 125mm for the walls, this structure offers significantly higher thermal performance and airtightness compared to standard timber garden rooms.

Key Features & Specifications

Structure & Build

SIP Panels:
150mm floor & roof
125mm walls
Engineered for thermal efficiency & structural strength
Built under 2.5m height (planning-friendly)
Custom
trapezoid design
to optimise garden space

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Exterior Finishes

Cedral cladding (front) to match the main house
Modern dark render system for a sharp architectural look
Aluminium bi-fold doors for full-width opening
Integrated external lighting

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Interior Fit-Out

Full mirrored back wall for depth and training functionality
Acoustic side walls with integrated LED lighting system
High-quality flooring suitable for gym use
Smart LED strip lighting (app-controlled)

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Electrical Package

Full electrical installation (consumer unit, sockets, lighting)
LG mirrorless air conditioning system (heating & cooling)
Ceiling-integrated Sonos speakers + amplifier
Bluetooth-enabled smart system
Wall-mounted TV setup

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Designed for Performance & Comfort

Unlike standard garden rooms, this gym is built using high-spec SIP panels, creating a space that maintains:
Stable temperature year-round
Reduced energy consumption
Superior acoustic performance
No cold spots or condensation issues
This allows the building to function as a true extension of the home, not just a seasonal space.

Why Choose TRJ Construction for Your Garden Gym?

SIP construction specialists (not standard timber builds)
Fully bespoke design tailored to your space
Complete service: design, build, electrics, finishes
High-end materials and premium detailing
Serving Bishop’s Stortford, Hertfordshire & North London

Home gym / fitness studio
Personal training space
Wellness & yoga studio
Multi-use lifestyle space

Customer Review

“Costi and the team have just completed a garden gym, fully furnished with internal/external spotlights, heating/aircon, ceiling speakers, hanging TV, LED lights etc.
The whole process from original quote, construction, to finish was really smooth and without any issues.
Costi is onsite each day and offers flexibility and ideas for enhancements.
I would highly recommend.” -by Martin Huxley