Learn why Building Control needs ventilation under SIP garden rooms on screw piles. TRJ Construction explains airflow, moisture, and regulation compliance.
Compare the benefits of a granny annexe vs a care home. Discover how TRJ Construction Ltd designs energy-efficient, accessible annexes that support family independence and long-term comfort.
TRJ Construction Ltd is a specialist Structural Insulated Panel (SIP) construction company delivering high-performance garden rooms and granny annexes across North London, Hertfordshire, Buckinghamshire and surrounding counties.
We design and build engineered living spaces using 150mm roof and base SIP systems, 125mm structural walls and professional K-Render finishes — creating buildings designed for durability, efficiency and long-term value.
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