Modern multi-story house with a combination of white, wood, and stone exterior, large windows, and a metal roof. A driveway with a parked silver car is in front, with stairs leading up to the entrance. The house is surrounded by trees and neighboring homes.

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.

Floor plan of a house with various rooms including living area, dining room, kitchen, bedrooms, bathrooms, and office or playroom, all outlined in white on a brown background.
Modern house with large glass windows, a stone and wood exterior, surrounded by green bushes and trees, with a patio area.

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

Modern two-story house with a stone exterior, black roof, large windows, and a backyard with a swimming pool enclosed by a black metal fence, surrounded by green grass and tall trees.
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