heolgerrig
This home in Merthyr has been completely reimagined, with a bold extension and full redesign that transforms both its exterior and internal layout. The result is a contemporary family home that embraces open-plan living, natural light, and modern materials to create a space that feels connected and inviting.
Overview
Hellgerig is a design-led home shaped around exceptional views, with extensive full-height glazing and a dramatic three-storey glass atrium as the project’s centrepiece. The architecture was conceived to connect interior space to landscape—maximising outlook, daylight, and arrival experience—while ensuring the building still performs as a comfortable, efficient home.
The Brief
The client’s priority was clear: create a modern house that fully embraces its setting through bold glazing and open, light-filled volumes. Key requirements included:
Large-format glazing to frame long views and bring the landscape into the home
A three-storey glazed atrium to create a striking internal focal point
A contemporary aesthetic with crisp detailing and clean lines
A solution that remained compliant and practical to build, despite the scale of glazing
Design Response
We developed the scheme around a clear spatial concept: a tall, glazed internal void that drives orientation and daylight deep into the plan. The atrium acts as both an architectural statement and an organising device—connecting levels visually and physically, while creating a strong sense of volume and calm.
The design focused on:
Controlled composition of glazing and solid elements to maintain balance and privacy
A layout that uses the atrium as a natural hinge point for circulation and views
High-quality junction detailing to keep the architecture sharp and intentional
Coordination that supports both aesthetic clarity and buildability
Planning and Performance
From a planning standpoint, the proposal progressed smoothly. The more demanding challenge was thermal performance: extensive glazing and a large internal void can create significant risks around heat loss, overheating, and comfort if not carefully resolved.
We addressed this through a rigorous technical approach—ensuring the design intent remained intact while meeting performance expectations. Key considerations included:
Thermal strategy development for large glazed areas and atrium behaviour
Glazing specification and performance alignment (U-values, solar control, comfort)
Detail-led coordination to manage thermal bridging and junction performance
Balanced daylight and solar gain control to support year-round comfort
What We Delivered
Concept design and atrium-led spatial planning
Planning drawings and coordination (smooth planning route)
Technical development focused on thermal efficiency and comfort
Coordination of key interfaces to protect the glazing-led design intent
Project Snapshot
Project Type: Contemporary new-build home
Key Feature: Three-storey glazed atrium with panoramic glazing
Focus: Views, daylight, architectural clarity, and high-performance detailing
Planning: Straightforward
Technical Challenge: Thermal efficiency resolution for high-glazing design