The Twin Peaks Passive House + ADU was designed and built to remain resilient in the face of natural disasters. Fortunately, the same great building strategies and design that provide resilience also provide a home that is incredibly comfortable and healthy while also visually stunning. This home’s journey began with a desire to design and build a house that meets the rigorous standards of Passive House. Before beginning the design/ construction process, the homeowners had already spent countless hours researching ways to minimize their global climate change footprint. As with any Passive House, a large portion of this research was focused on building envelope design and construction. The wall assembly is combination of six inch Structurally Insulated Panels (SIPs) and 2x6 stick frame construction filled with blown in insulation. The roof assembly is a combination of twelve inch SIPs and 2x12 stick frame construction filled with batt insulation. The pairing of SIPs and traditional stick framing allowed for easy air sealing details and a continuous thermal break between the panels and the wall framing. Beyond the building envelope, a number of other high performance strategies were used in constructing this home and ADU such as: battery storage of solar energy, ground source heat pump technology, Heat Recovery Ventilation, LED lighting, and heat pump water heating technology. In addition to the time and energy spent on reaching Passivhaus Standards, thoughtful design and carefully chosen interior finishes coalesce at the Twin Peaks Passive House + ADU into stunning interiors with modern farmhouse appeal. The result is a graceful combination of innovation, durability, and aesthetics that will last for a century to come. Despite the requirements of adhering to some of the most rigorous environmental standards in construction today, the homeowners chose to certify both their main home and their ADU to Passive House Standards. From a meticulously designed building envelope that tested at 0.62 ACH50, to the extensive solar array/ battery bank combination that allows designated circuits to function, uninterrupted for at least 48 hours, the Twin Peaks Passive House has a long list of high performance features that contributed to the completion of this arduous certification process. The ADU was also designed and built with these high standards in mind. Both homes have the same wall and roof assembly ,an HRV, and a Passive House Certified window and doors package. While the main home includes a ground source heat pump that warms both the radiant floors and domestic hot water tank, the more compact ADU is heated with a mini-split ductless heat pump. The end result is a home and ADU built to last, both of which are a testament to owners’ commitment to lessen their impact on the environment.

Low-maintenance side yard with gravel pathway and lined by Carpinus betulus 'Fastigiata' (Upright Hornbeam).
This is an example of a small modern full sun side yard gravel landscaping.

**I. Spatial Composition & Architectural Volume** This interior operates on a strategy of framed extension, in which the room's perceived volume is borrowed from the garden beyond rather than asserted through internal grandeur. The composition is governed by a rigorous orthogonal discipline: a full-height sliding glazing system, set within a deep oak-lined reveal, functions as both aperture and proscenium, its slender mullions dividing the exterior into a triptych of vegetal planes. The generous depth of that reveal — expressed as a substantial threshold plinth and continuous jamb casing — reads less as trim than as tectonic gesture, giving weight and thickness to the enclosure and reinforcing the sense of a pavilion pressed against a green wall. To the left, a floor-to-ceiling pocketing door of book-matched, quarter-sawn oak establishes a monolithic vertical counterpoint, its recessed flush pull the only interruption of an otherwise uninflected plane; the shallow return of the wall beyond it creates a compressed entry sequence that releases into the primary volume. The flat, shadowless plaster ceiling maintains a neutral lid over the composition, while the furniture plan is deliberately low-slung and horizontal — a deep sectional set parallel to the glazing, a leather-topped ottoman, and a low occasional table — so that no element rises to compete with the sightline. Circulation is implied along the wall's edge, funnelling toward the terrace and its al fresco dining vignette, which acts as the room's terminal focal point and extends the interior axis outward. **II. Materiality, Color & Texture** The palette is a study in low-contrast tonal layering, calibrated within a narrow band of warm neutrals and animated almost entirely by the saturated chlorophyll green of the ivy screen. Rift-cut white oak, finished in a matte oil that reveals rather than glosses its medullary figure, provides the room's structural warmth — appearing in the joinery, the window surround, and the herringbone parquet, whose fine chevron rhythm introduces a subtle graphic pattern at foot level. Walls are treated in what appears to be a woven grasscloth or linen-effect wallcovering in a pale oatmeal tone, its faint horizontal striation catching raking light and lending textile softness to the perimeter. Against this, the seating is upholstered in a tightly woven, undyed linen-cotton blend with a biscuit-tufted seat platform, its slubbed irregularity a deliberate foil to the precision of the millwork. The cushion program provides the composition's only chromatic incident: an indigo-ground ikat or *kasuri* resist-dyed weave, with its blurred weft-broken banding, paired with a heavier blanket-stitched wool in glaucous blue-grey and buff stripes. Underfoot, a hand-knotted silk-and-wool rug in slate and mineral grey carries an attenuated ogee lattice, its lustrous pile providing cool relief beneath the warmer wood tones. The plinth-mounted travertine or reconstituted-stone planter — matte, porous, faintly chalky — and the honed grey stone paving beyond introduce lithic gravity, balancing the prevailing softness with a mineral edge. **III. Lighting, Atmosphere & Style Profile** Illumination here is almost entirely diurnal and indirect: north-oriented or hedge-filtered daylight arrives diffuse and green-cast, washing the space in a soft, even luminance that suppresses hard shadow and privileges texture over drama. The ivory sheer, hung on a discreet recessed track, tempers glare while retaining silhouette legibility, and the adjacent pinch-pleated overdrape in a taupe-bronze silk-blend — with its subtle vertical striation and slight sheen — offers the option of full blackout while contributing a note of drapery-weight formality. Artificial sources are conspicuously concealed; no decorative fixture interrupts the ceiling plane, implying a scheme of recessed low-glare downlights or perimeter cove washing designed to sustain the daytime ambience after dusk. The resulting atmosphere is one of composed reticence — quiet, tactile, and deeply oriented toward the garden. Stylistically, the project synthesises Japandi restraint (the pocketing timber plane, the shadow-gap detailing, the reverence for the framed view) with the material sensuality and drapery conventions of European Soft Modernism, yielding a warm minimalism in which luxury is communicated through joinery tolerance, textile hand, and the disciplined editing of the palette rather than through ornament or statement furniture. It is an interior conceived as a calm neutral ground — an armature for light, landscape, and the slow accretion of daily life.

Interior of 8x12 Poolshed with 6x8 Greenhouse custom Built in Westwood MA
Mid-sized farmhouse detached greenhouse photo in Boston

Runnels in the concrete function to drain water out of the patio area but also add a subtle inlay detail. Here the runnel is filled with both beach pebbles and dry-laid bluestone. Renn Kuhnen Photography

This is an example of a mid-sized traditional full sun backyard mulch formal garden in Denver for spring.

Taylor Roberts
This is an example of a tropical landscaping in Hawaii.

Inspiration for a small craftsman single-wall enclosed kitchen remodel in Minneapolis with medium tone wood cabinets, granite countertops, blue backsplash, ceramic backsplash, stainless steel appliances and an island

Example of a small classic 3/4 white tile and stone tile mosaic tile floor alcove shower design in Chicago with an undermount sink, recessed-panel cabinets, black cabinets, quartzite countertops, a two-piece toilet and gray walls

Marie Philibert-Dubois
Inspiration for a small contemporary full sun courtyard gravel vegetable garden landscape in Montreal.

photography by Joslyn Amato
Example of a large minimalist backyard concrete patio kitchen design in San Luis Obispo with a pergola

Clematis armandii 'Evergreen Clematis' (foreground) arches over a custom-built cedar arbor, modeled to accentuate the home's Craftsman-style architecture. Welded mild-steel panel fills create a scaffold for Akebia quinata 'Five-leaf Akebia Vine' (background), lending seasonal privacy and afternoon shade along this narrow sideyard access walkway.

Farmhouse home design photo in Boston

Exterior, brick, lime, limewash, painted brick, architectural finish

This garden is part of author and designer Pamela Crawford's Palm Beach county trial gardens. She test plants and garden products prior to writing about them. Discover thousands of ideas for Palm Beach County landscapes on Pamela's web site, pamela-crawford.com. Pamela designs landscapes, container gardens, and outdoor living areas throughout Palm Beach County, FL, including Boca Raton, Delray Beach, the town of Palm Beach, Palm Beach Gardens, Jupiter, and Wellington. She provides beautiful, custom designs that include professional installation of beautiful plant material, planters, and outdoor furniture and accessories.

Ryan Day Thompson
Inspiration for a contemporary wooden u-shaped staircase remodel with wooden risers

Nestled in the lush landscape, a modern reinterpretation of a once-fallen barn now features a charming guest cottage with stylish details and contemporary amenities. Situated along a narrow lot in Germantown, New York, the cottage completes a cluster of existing buildings, forming an intimate courtyard on one side. Steel effect folding patio doors fully open the living areas to the expansive fields and the Catskill Mountains beyond. The homeowners, a young family with parents living abroad, envisioned a cozy yet modern ADU for extended stays. Designed by Lauren Cawse, AIA, architect and partner at The Art of Building, the year-round retreat draws inspiration from traditional local barns while embracing a seamless indoor-outdoor connection. Captivating Guest Cottage Design Enhances the Senses with Steel Effect Folding Patio Doors The modern ADU design started with the site itself. Positioned between residential and commercial neighbors, the elongated property required a careful balance of privacy and openness. Architect Lauren Cawse approached the layout by redefining the existing house and garage as the east and west sides of an outdoor room, with the new cottage forming its southern boundary. This arrangement created a clear courtyard near the main residence while directing the 800-square-foot guest house toward the open meadow and the distant Catskill Mountains. “The unique character of the site and its history inspired the architectural direction,” says Cawse. “The intent was to create a secondary structure in the compound in clear contrast to the modern farmhouse style of the house and garage.” A Barn-Inspired Exterior Adds Visual Flair The exterior envelope evokes a traditional barn with a simple gable shape, weathered wood siding, cedar shingles, and a foundation veneer made of local fieldstone. A large sliding barn door adds a complementary feature to the courtyard-facing side, creating a dynamic opening that maintains uninterrupted views through the cottage to the meadow beyond. Steel effect folding patio doors surrounding the structure add a modern touch of transparency, and simulated divided lites allow the contemporary glass wall systems to harmonize with the traditional elements of the modern ADU design. “The goal was to fully open the living areas to the outdoors, framing views to the meadows and mountains,” says Cawse. “The positioning of the NanaWall systems frames the views and, when open, dissolves the boundary between inside and out.” Interior Design That Mirrors Nature’s Tranquility Inside, the design program features a simple layout with one bedroom, a full bath, a kitchenette, and a living area with a wood-burning stove. The interior, a collaboration between The Art of Building and the homeowners, is defined by an understated palette and tactile materials that reflect the natural setting. Color is introduced through the framed glass views on all sides of the structure. Reclaimed timber collar ties span the ceiling overhead, while stone surfaces and naturally patinated metal accents add quiet texture throughout. Custom hand-painted Delft tiles along the kitchen backsplash add personal detail, and terra cotta flooring in the bathroom brings warmth and old-world charm. Soaring ceilings and abundant daylight create a peaceful play of light and shadow, shifting subtly with the seasons and emphasizing the cottage’s connection to the natural landscape outside. Sleek Steel Effect Folding Patio Doors Elevate the Modern ADU Design Aesthetic Three customized steel effect folding patio doors define the living space, each aligned to respond to a different edge of the site. The largest, spanning nearly 20 feet wide and just under eight feet tall, opens directly onto the stone patio, allowing the main gathering area to extend fully into the landscape. Along the side of the living room, a smaller 10-foot-wide system introduces more light and ventilation, nearly creating an open corner condition if not for the structural post that supports the façade and roofline. At the rear, a fourth ten-foot-wide system features a French door swing panel configuration that opens toward the courtyard, strengthening the design connection to the main residence. All steel effect folding patio doors were specified with a low-maintenance, water-rated Performance Sill to safeguard against inclement weather while providing a seamless, barrier-free transition to the outdoor patio. Unique Customizations for Visual Appeal and a Steel Effect Each folding patio door system is configured to open outward, maximizing usable floor space in the compact interior and allowing furniture placement to remain uninterrupted. By stacking outward, the steel effect folding patio doors, specified in a SE Classic Bronze powder coat, ensure every inch of the cottage is optimized. Simulated divided lites create a consistent rhythm across windows and doors, maintaining alignment with the traditional barn-inspired exterior. In the bedroom, a three-panel, 10-foot-wide system mirrors these customizations, matching the steel effect divided-lite pattern and outward-opening configuration, extending the indoor-outdoor connection while preserving visual continuity throughout the ADU. “The divided lites were crucial to the architectural vision, and while budget prohibited a steel and glass system, NanaWall Systems’ thin frames provide the open and airy feeling we hoped to attain,” says Cawse. “Simulated divided lites transition the thoroughly modern element of the glass walls to remain in harmony with the otherwise traditional palette.” Matching Windows and Doors: Create a Cohesive Design Program Alongside the larger openings in the living areas and bedroom, a smaller 3-foot-tall NanaWall tilt turn window was added to the bathroom. This window-sized NanaWall system perfectly matches the divided lite panels and sleek frames of the steel effect folding patio doors, creating a cohesive modern ADU design throughout. The compact opening provides ventilation and natural light, enhancing the spa-like atmosphere along with natural stone flooring. The matching glass lines and sleek profiles of the NanaWall Generation 4 comprehensive product line further unify visual consistency, allowing each system to fit into the architectural style seamlessly. “This project had three bifold glass walls, a pair of double French doors with sidelites, and a single tilt turn window,” says architect Lauren Cawse. “Being able to work with a single manufacturer provided aesthetic cohesiveness and simplified coordination.” Sustainability Where It Matters Most New York weather can vary from hot 85-degree summers to cold 26-degree winters. Creating an efficient living space was a primary goal. To achieve this, the design included Timber HP-insulated walls and floors with a heat pump system for effective heating and cooling. Additionally, the steel effect folding patio doors and windows were specified with double-glazed panels to ensure a tight building envelope. Indoor-Outdoor Living Spaces for Relaxing and Entertaining In-house landscape designer Liz Pulver worked closely with the team to conceive open-air spaces that enhanced the connection between inside and outside. To the south end of the lot, the landscape transitions into an “enhanced meadow,” allowing the cottage to feel embedded within the surrounding fields rather than set apart from them. A circular pool was designed to mimic a natural pond with a modest footprint. Around it, a minimalist fence and sunken stone ha-ha wall offer discreet safety for young children. Limited space due to existing infrastructure and zoning setbacks left only a small footprint for the swimming pool, prompting the designer to propose a circular form that maximized the usable swimming area. “We felt that the perfect way to integrate a pool into the property and to honor the landscape would be to treat the pool as a piece of art itself,” says Pulver. “The result is a beautiful round pool that serves as both a functional retreat and a sculptural moment.” Final Thoughts: A Barn-Inspired Design for Contemporary Living This modern ADU design skillfully combines modern features with the enduring charm of traditional barns. The outcome is a welcoming living space that stands out amid a stunning landscape. Natural materials that mimic the beauty of the outdoors, expansive steel effect folding patio doors that fill the space with fresh air and natural light, and a restrained interior design work together to create an inviting retreat for everyday living, throughout the seasons. “When entering the site, the cottage feels as though it was always there,” says Cawse. “It achieves its two opposing goals by creating a feeling of intimacy and enclosure near the house while also functioning as a threshold to the expansive fields and views beyond.” Explore how NanaWall folding patio doors elevate other ADU spaces in our inspiring project photo gallery! Frequently Asked Questions (FAQs) What is Slimline Steel Effect? Steel Effect is a folding patio door design option that replicates the appearance of traditional steel-framed glass doors. It combines the look of steel with the performance benefits of aluminum, including energy efficiency, low maintenance, greater design flexibility, and lower cost. How does a NanaWall Steel Effect aluminum system compare to traditional steel-framed glass doors? NanaWall Slimline Steel Effect folding patio doors replicate the narrow frames of traditional steel doors with improved weather and thermal performance and easier operation. They are lighter, more corrosion-resistant, and feature a thermally broken design for better energy efficiency and lower long-term maintenance. What are the benefits of Steel Effect folding glass walls? Steel Effect folding glass walls deliver the narrow sightlines and grid patterns of traditional steel, combined with the performance and low maintenance of aluminum. The slimline steel effect option offers all the benefits of our Generation 4 product line, including the FourFold / SixFold floating panel set option and smooth operation with Gothic arch stainless steel rollers on a stainless steel track. Can Slimline Steel Effect glass walls be customized? Yes, these systems offer a high level of customization to suit different architectural styles, including simulated divided lites specified in various patterns, popular SE colors for a true steel effect look, and a contemporary glass stop option for a refined look. Contact your local NanaWall representative for additional options here. How energy-efficient and weather-resistant are Slimline Steel Effect folding patio doors? Steel effect folding systems are engineered for strong thermal and weather performance. Thermally broken frames and high-performance glazing help improve energy efficiency. Each NanaWall system has been independently tested for air, water, structural integrity, and forced entry with excellent results.

Photo: Carolyn Reyes © 2015 Houzz
Patio - mediterranean patio idea in Los Angeles