The Hidden Hills project by Jenny Martin Design demonstrates how contemporary coastal homes integrate architectural vision with structural engineering to create residences that are both visually striking and durable. Located on Gonzales Bay with unobstructed ocean views, this west coast contemporary build challenges conventional approaches through its minimalist aesthetic, suspended staircase, and carefully coordinated material palette. Understanding the principles behind architectural design and building envelope systems helps homeowners and builders make informed decisions during the design and construction phases.
Steel Structure as Architectural Feature
The suspended white oak clad staircase in the Hidden Hills project is more than a circulation element, it is a sculptural centerpiece that required innovative engineering and precise coordination between trades. The staircase hangs from the structure above without visible intermediate supports, creating the illusion that it floats within the double-height space. This approach demanded detailed study of steel framing principles, connection design, and modern construction applications to ensure the staircase met both aesthetic and safety requirements.
Steel Connection Design for Architectural Exposed Structures
Exposed steel structures in residential applications require connections that are both structurally adequate and visually clean. Hidden connections, knife plates, and concealed flanges hide the hardware while transferring the full load. The Hidden Hills staircase uses a concealed steel frame within the white oak treads and risers, with the steel hanger rods located within the wall at the top landing.
| Connection Type | Typical Application | Load Capacity | Aesthetic Quality |
|---|---|---|---|
| Concealed knife plate | Stair stringer to beam connections | 5,000 to 15,000 lbs | Fully hidden, clean lines |
| Flush bolted end plate | Beam to column moments | 10,000 to 30,000 lbs | Minimal visible hardware |
| Pin connection | Suspended stair hangers | 2,000 to 8,000 lbs per hanger | Sleek single point of attachment |
| Welded moment connection | Cantilevered balcony supports | 20,000 to 60,000 lbs | Requires grinding and finishing |
The seventeen-foot concrete hearth in the living room is another structural feature that required careful engineering. At 17 feet long and paired with a full-height drywalled fireplace surround, the hearth acts as a thermal mass that moderates indoor temperature while anchoring the open-plan living space. The concrete pour required formwork rated for 3,000 to 4,000 psi concrete with fiber reinforcement to prevent shrinkage cracking during curing.
Site Planning and Access Design for Coastal Properties
Coastal properties present unique challenges for site planning and access design. The Hidden Hills project required careful coordination of the building footprint, driveway alignment, pedestrian pathways, and utility connections on a site with views of Gonzales Bay. Geometric design factors for access roads and pathways including gradient, curvature, and sight distance play a key role in ensuring safe and functional site circulation on sloped coastal terrain.
Site Grading and Drainage
Proper site grading directs surface water away from the building foundation and toward approved drainage outlets. Coastal properties in the Pacific Northwest receive 30 to 60 inches of annual rainfall, making drainage design a high priority. The grading plan for Hidden Hills accounts for the natural slope toward the shore while maintaining positive drainage around the building perimeter.
- Minimum 2% slope away from foundation walls for the first 10 feet
- Catch basins and French drains at low points in the landscape
- Permeable paving materials in parking areas to reduce runoff volume
- Rain gardens and bioswales for on-site stormwater management
- Building pad elevated at least 6 inches above the 100-year flood elevation
The outdoor dining area and covered patio required careful leveling and foundation work to integrate with the main structure while maintaining the visual connection to the shoreline. The patio extends the living space outdoors, with the beamed tongue-and-groove ceiling continuing from the interior to create a seamless indoor-outdoor transition.
Hardscape and Pavement Systems
The hardscape around the Hidden Hills property includes the driveway, patios, pool deck, and pedestrian pathways. Each of these surfaces must withstand coastal weather conditions including salt spray, heavy rainfall, and freeze-thaw cycles. Pavement design principles for flexible and rigid pavements apply to residential driveways and pathways as much as they do to roadways, though the load requirements differ significantly.
Residential Pavement Options Comparison
| Pavement Type | Typical Thickness | Base Material | Lifespan | Cost per Square Foot |
|---|---|---|---|---|
| Asphalt driveway | 3 to 4 inches | 6 to 8 inches of crushed stone | 15 to 25 years | $3 to $7 |
| Concrete driveway | 4 to 6 inches | 4 to 6 inches of compacted gravel | 25 to 40 years | $6 to $12 |
| Interlocking pavers | 2.5 to 3.5 inches | 8 to 12 inches of aggregate | 20 to 35 years | $10 to $20 |
| Stamped concrete patio | 4 to 5 inches | 4 to 6 inches of compacted gravel | 20 to 30 years | $8 to $15 |
The concrete pavements around the pool and outdoor living areas require control joints spaced at intervals of 8 to 12 feet to prevent random cracking. Joints are cut to a depth of one-quarter to one-third of the slab thickness and filled with flexible sealant. For coastal properties, structural design methods for flexible and rigid pavements help engineers select appropriate thickness and reinforcement for the specific soil conditions and anticipated loads.
Kitchen Design and Material Choices
The Hidden Hills kitchen features an entirely wood design, including custom white oak cabinet doors and pulls. This approach meets the clients desire for natural materials while minimizing visual distraction from the ocean view. The low-profile lighting in the kitchen and dining room creates a statement without obstructing sight lines to the water. Accessible kitchen design principles based on universal design ensure that the space works for all users regardless of age or mobility level. Universal design principles include barrier-free entry paths, adequate clearance zones of 42 to 48 inches for wheelchair maneuvering, and variable-height countertops that accommodate both standing and seated users.
Key Kitchen Design Features
- Bi-level kitchen island with granite countertop for food preparation and casual dining
- Hidden entry to the clean, minimalist white pantry maintains the clean sight lines
- Marble cladding on the island and backsplash provides a durable, heat-resistant work surface
- Custom modern shaker cabinet doors with white oak pulls
- Undercabinet task lighting with dimmable LED strips for adjustable illumination
Wood kitchen cabinetry in coastal environments requires specific finishing techniques to protect against humidity fluctuations. White oak has natural moisture resistance with a Janka hardness rating of 1,360, making it suitable for coastal applications when properly sealed with a conversion varnish or catalyzed lacquer. The cabinetry in Hidden Hills uses a satin finish that reflects light without creating glare on the adjacent ocean-facing windows.
Countertop Material Selection
| Material | Durability Rating | Heat Resistance | Stain Resistance | Cost per Square Foot |
|---|---|---|---|---|
| Granite | 7 out of 10 on Mohs scale | Up to 250°F with no damage | Requires annual sealing | $40 to $100 |
| Quartz | 7 out of 10 | Up to 150°F before resin damage | Non-porous, no sealing needed | $50 to $120 |
| Marble | 3 out of 10 | Up to 200°F | Requires sealing every 6 to 12 months | $60 to $150 |
| Soapstone | 3 out of 10 | Up to 350°F | Naturally stain resistant | $70 to $130 |
The marble-clad island in Hidden Hills combines luxury appearance with practical functionality. Marble remains cool to the touch, making it ideal for pastry work, and its natural veining creates a unique pattern that cannot be replicated in engineered materials. Regular sealing with a penetrating sealer protects the stone from stains while maintaining its natural appearance.
Building Envelope Performance and Long-Term Durability
The building envelope at Hidden Hills must resist coastal weather conditions while maintaining the clean lines of the contemporary design. The beamed tongue-and-groove ceiling, full-height drywalled fireplace, and extensive glazing all create potential thermal bridges that require careful detailing. The engineering team specified continuous insulation, air barrier systems, and high-performance glazing to meet modern energy codes while preserving the architectural intent.
Structural steel elements within the building, including the supports for the suspended staircase and the framing around large glazed openings, require protection against corrosion in the coastal salt environment. Hot-dip galvanizing or epoxy coatings provide long-term protection for steel beams, columns, connections, and composite construction elements exposed to marine air. The Hidden Hills project uses a combination of protected interior steel and corrosion-resistant stainless steel for exposed exterior elements, ensuring the structure maintains its integrity over decades of coastal exposure.
The theater room upstairs, with access to a balcony overlooking the ocean, required additional acoustic isolation to prevent sound transmission to adjacent spaces. Resilient channel clips and sound-dampening insulation in the wall and ceiling assemblies provide STC ratings of 50 or higher between the theater and neighboring rooms. The balcony door uses a commercial-grade sliding glass door system rated for coastal wind loads, typically 110 to 130 mph in Pacific Northwest coastal zones.