About us
MyGrannyAnnexe is part of TRJ Construction Ltd , a leading construction company in the UK, specializing in the design and construction of high-quality garden rooms, granny annexes, and home extensions. With years of experience and a team of skilled craftsmen, we offer bespoke construction solutions that are tailored to the unique needs and preferences of our clients.
I’m Constantin “Costi” Tiseanu, founder and director of TRJ Construction Ltd.
With over 25 years of hands-on experience in the construction industry, I have dedicated my career to building high-performance, energy-efficient structures that are designed to last — not just look good for a few years.
My journey began as an installer and project manager within the garden building sector, where I developed deep practical knowledge of structural insulated panel systems, foundation methods, and finishing standards.
In 2012, I founded TRJ Construction Ltd with one clear objective:To build better, stronger and more technically advanced SIP structures than what the market was offering.
We do better
MyGrannyAnnexe
is part of
TRJ Construction Ltd
Registered office
39 Rushleigh Avenue ,Waltham Cross ,EN8 8PP
VAT no.153770309
Contact
Costi Tiseanu :+44 79 66800 519
