Bespoke SIP Granny Annexe Build in Mill Hill, London

Project Overview

TRJ Construction Ltd recently completed a modern SIP granny annexe in Mill Hill, London, designed to maximise functionality within a narrow garden. Our team managed the entire process — from securing planning permission to ensuring full building control compliance — resulting in a stylish, self-contained living space.

Key Challenges & Solutions

• Vegetation & Foundations: Due to nearby trees and roots, we installed extra-deep foundations to ensure long-term stability and compliance with structural requirements.
• Space Restrictions: The garden’s narrow layout required careful planning and efficient use of every square metre without compromising comfort or design.
• Approvals: We coordinated with the local authority to obtain planning permission and handled building control inspections throughout the project.

Design & Features

• White K Render Exterior: A crisp, low-maintenance finish that gives the annexe a modern and clean aesthetic.
• Self-Contained Facilities:
• Toilet and shower room with modern fittings.
• Compact kitchen featuring essential appliances and smart storage solutions.
• Energy-Efficient SIP Panels: High thermal performance ensures year-round comfort and reduced energy bills.

Outcome

The finished granny annexe is a functional, comfortable, and stylish space, ideal for independent living or guest accommodation. Despite the challenging site conditions, the project was delivered on time, on budget, and fully approved by building control.