New Coastal Passivhaus Development, Trefin, Pembrokeshire

PassivHaus New Homes Development of Just Three Five-Bedroom Residences

Fine and Country West Wales are delighted to present the Greengull, Llwyn Onn development—an exclusive collection of just three superior detached properties, each exemplifying the pinnacle of design and sustainable living. Constructed to PassivHaus standards, these homes are engineered to be as energy-efficient and economical as possible, offering an exceptional living environment with consistently controlled temperatures and continuously filtered air.

Attractively designed and partially clad in Siberian Larch, these residences are thoughtfully crafted to harmonise with their surroundings in the sought-after Trefin Conservation Area. The architectural brilliance of these properties is evident in their ultra-quiet living spaces, underscored by triple-glazed windows that ensure tranquillity within. Each home is uniquely designed, with subtle variations in style and perspective, and has been favourably reviewed by the Design Commission for Wales. This endorsement highlights the flexible, stylish modern accommodations that set these properties apart.

A “PassivHaus” might look like a normal house, but it’s much more than that:

Comfortable – constant internal temperature.

Healthy – internal air is continuously circulated and filtered.

Quiet – triple-glazed windows minimise external noise.

Economic – approximately 90% lower energy costs than a conventional build.

At the heart of each home, an attractive open-plan living area seamlessly connects to a south-facing terrace, boasting expansive countryside views. The integration of living spaces continues with a light-bathed dining area featuring full-height windows and a chic, modern kitchen with dual-aspect views. The large windows in the southern elevation flood the interior with light and contribute significantly to the overall energy efficiency of the homes.

The upper levels are equally impressive, featuring a luxurious master bedroom with an ensuite and spectacular views, alongside two additional bedrooms and a modern family bathroom.

The lower ground floor offers versatile living options, with potential for annexe opportunities. This space could accommodate two additional bedrooms or be utilised as a gym, studio, or office. It also houses the essential utility and plant rooms, adding functional space to the elegant design.

Externally, the properties feature beautifully landscaped gardens and ample parking for up to three vehicles. With stunning countryside vistas and just a stone’s throw from the idyllic beaches of Trefin, these homes offer a rare opportunity to own a new property within the Pembrokeshire National Park. Additionally, the development boasts easy access to larger nearby towns, enhancing connectivity and convenience.

Each residence at Llwyn Onn (Ash Grove) captures the essence of sophisticated, eco-conscious living in one of North Pembrokeshire’s most coveted locales. This exclusive opportunity is available only through Fine and Country West Wales.

Entrance Porch

Step into the home through a sheltered entrance porch—offering a warm welcome with subtle lighting and protection from the elements. A perfect transitional space that reflects the home’s commitment to both practicality and elegant design.

Entrance Hall

Bright and spacious, the entrance hall sets the tone for the home’s contemporary layout. Featuring clean lines and thoughtful finishes, it seamlessly connects the upper and lower levels while providing immediate access to the main living areas.

Sitting Room/ Kitchen / Dining Room

At the heart of the home lies the open-plan living area—a stunning fusion of lounge, kitchen, and dining spaces. Designed to maximise natural light and scenic views, this area is flooded with daylight from the full-height south-facing windows. The sleek, dual-aspect kitchen offers both functionality and flair, while the adjoining dining and sitting areas create the perfect environment for entertaining or relaxing.

Balcony/Deck

Flowing from the main living area, the generous balcony deck presents a peaceful retreat with panoramic countryside views. Ideal for al fresco dining or quiet evenings, the space harmoniously blends indoor comfort with outdoor serenity.

Cloakroom

Conveniently located just off the entrance hall, the stylish cloakroom features high-quality finishes, a contemporary WC, and basin—offering both function and finesse for guests and family alike.

Plant Room/Utility Room

Efficiently tucked away, the plant and utility room houses the advanced mechanical systems of this PassivHaus property. With ample storage and workspace for laundry and home essentials, it reinforces the home’s commitment to smart, sustainable living.

Studio/Reception Room/Gym Room

This flexible space is a true asset—whether used as a home office, art studio, gym, or an additional reception room. Light-filled and adaptable, it can evolve with your lifestyle needs while maintaining the quiet comfort that defines these homes.

Patio Area

Accessible from the lower ground, the patio area invites indoor-outdoor living with ease. Surrounded by landscaped gardens, it's an ideal spot for morning coffee, yoga sessions, or entertaining with a view

Bedroom 4 Suite

Generously proportioned and thoughtfully placed for privacy, Bedroom 4 offers the potential for a guest suite or self-contained annexe. With direct access to outdoor space and a calm ambience, it’s perfect for multi-generational living or visiting guests

Ensuite Shower Room

Connected to Bedroom 4, the modern ensuite boasts a walk-in shower, premium fittings, and elegant tiling—offering a spa-like experience within your own home.

Bedroom 2

A spacious and versatile double room, Bedroom 2 benefits from abundant natural light and a peaceful atmosphere—ideal for a second master or teenage retreat.

Bedroom 3

This charming bedroom enjoys pleasant rear-facing views and is ideal for children, guests, or as a study. With a calming colour palette and natural materials, it’s a sanctuary for rest and creativity.

Family Bathroom

Beautifully appointed, the family bathroom combines form and function with a full-size bath, modern fixtures, and sleek contemporary styling. Perfect for daily routines or indulgent evenings.

Garden

Beautifully presented garden, to the front of the property.

Parking - Driveway

Ample parking for up to three vehicles.