Cottle Net Zero Energy Home

Design|Build: The Cottle Zero Energy Home was the 1st Net Zero Energy new home in California and is recognized as one of the highest-performance, greenest and most energy efficient homes in the State.  It was awarded a special commendation by the California Energy Commission.  It boasts all the features you would expect in a custom luxury home in Silicon Valley, and much more. Explore the information, document links and videos below to learn about this ground-breaking contemporary home redefining performance standards for indoor air quality, comfort, energy and water efficiency, and of course, modern style and luxury.

Cottle Facade _Horizontal

Projects Cottle Kitchen 1

Projects Cottle Living Room

Cottle Master Bath

Cottle Central Staircase

Cottle Rear Deck

Cottle Side Yard

Take the Virtual Tour



Channel 5 News Story

The California Energy Commission awarded One Sky Homes Certification as the First Net Zero Energy new home in California for this project. We are proud to have received a special Resolution signed by the Commissioners of the CEC recognizing this achievement. Read the CEC Resolution.



More Videos about special features, design and construction.


Features Summary

Home Performance Certifications

Indoor Air Quality

  • EPA Indoor Air Plus certified; highest residential standard achievable
  • Zehnder (Swiss) continuous (.33ACH) ventilation system w/heat recovery & allergenic air filtration (Merv 13)
  • NightBreeze night ventilation cooling w/allergenic filtration (Merv 13)
  • Zero VOC paints/low-VOC wood finishes
  • Take a deep breath …feel the difference!

Thermal Comfort

  • Passive House certified
  • Guaranteed even temps: avg +/- <1degF everywhere
  • Guaranteed 70-74 deg continuously; you choose your comfort zone
  • German Triple pane tilt/turn windows & doors …no drafts, no cold spots
  • Continuous Heat Recovery Ventilation = even temps & fresh air everywhere
  • Solar awnings & shades …no hot spots
  • NightBreeze natural, night ventilation cooling
  • Lennox heat pump heating/cooling


  • Ultra quiet acoustics w/super-insulated walls & triple-pane windows
  • Ten ft ceilings 1st flr; Nine ft 2nd flr
  • Premium sound isolation layers betw floors
  • Windows can be closed, not required for ventilation
  • Ultra-quiet HVAC systems
  • Ultra-quiet dishwasher


  • First Certified Net Zero Energy Home in CA
  • Solar PV & Hot water systems
  • Home produces more energy than it uses
  • <=$0 utility bills* …guaranteed by OSH!
  • Surplus solar power for EV charging; up to 20,000 miles/yr free driving!!
  • Amazing $10,000/yr in combined home/transportation energy costs avoided ...$300,000 over 30 years!
  • Guilt-free long, hot showers! …water heated by the sun, then goes to grey water system to water landscaping
  • Home so efficient it can be heated w/hair dryer …see the YouTube video “Hair Dryer Home”
  • Energy Star appliances; efficient lighting & controls; ultra-efficient heat pump, etc., etc
  • Real time energy monitoring system ...see the meter run backwards!


  • Grey water system recycles shower, vanity, clothes washing water to landscaping
  • 0.8 gpf toilets; other efficient fixtures
  • OnDemand hot water system …always hot water in 3 secs, no water/energy waste
  • Whole house water filtration
  • Salt-free water softening: Nuvo H2O
  • EverPure dual-cartridge drinking water system


  • Old-growth recycled porch columns from Del Monte cannery
  • “Real” stone exterior wainscot & columns
  • Ten ft ceilings 1st flr; Nine ft 2nd flr
  • Solid, clear-finished premium 8’ wood doors, cabinets and moldings
  • Imported triple-pane windows & patio doors
  • Custom triple-pane glass & Mahogany entry door system
  • Premium wide-plank bamboo floors
  • Lutron Maestro digital, soft on/off lighting controls
  • Great natural lighting and upstairs views


  • Professionally-designed Chef’s kitchen
  • Ultra Premium Appliances: Wolf Pro 48” range w/grill, Sub Zero 48” built in ref/frz, Bosch Ultra-Silent DW, (mfg. in Germany)
  • Large center island with large SS prep sink, built-in maple block prep center
  • Large Cucina-Italia SS apron front dish sink
  • High Arc, Pull-Out satin nickel faucets
  • Pot filler faucet over range
  • Full-extension drawers on all base cabinets
  • Premium natural cherry cabinetry throughout
  • Premium quartz counters and backsplashes
  • Premium task lighting & storage accessories

Master Bedroom Suite

  • Huge master suite with 8’ dbl door entry
  • Bedside security and lighting controls
  • Pre-wired for  video, network and telephone
  • Premium low voltage lighting w/dimming control
  • Huge “hers & his” walk-in closet with premium built-in organizing system
  • Large master bath with premium travertine walls, tub surround and shower
  • White limestone floors
  • Frameless heavy glass shower surround
  • Shower seat and adj. height shower head
  • Oval soaking tub w/European hand shower
  • Premium natural cherry vanity cabinets w/full extension drawers
  • Premium Caeserstone vanity counter with double vessel sinks
  • Premium Hansa (German) brushed nickel faucets, shower & bath fixtures
  • Built in bathroom heaters

Great Room

  • Large great room with 10’ ceiling
  • Connected kitchen, dining, and home entertainment area
  • Sorpetaler (German) tilt/turn windows & patio doors to deck and back yard
  • Bio-ethanol wall-mounted eco fireplace
  • Premium architectural lighting, pre-wired Dolby surround sound

Laundry & Pantry

  • Large combination laundry, utility, pantry directly connected to kitchen
  • Recycled tile floor
  • Cherry cabinets and quartz counters
  • Large laundry sink
  • Frigidaire (top-rated Energy Star 2012) front loading washer/dryer
  • Built-in deluxe ironing center
  • Pantry storage wall


  • 8’ Tilt/Turn patio door to backyard
  • Electric solar shade screens
  • Great natural lighting
  • Pre-wired video, telephone, network

Other Bedrooms (3)

  • Large rooms; guest BR w private bath
  • Large closets with premium organizing systems
  • West BRs w solar shade screens
  • Guest BR w access to backyard
  • Pre-wired video, telephone, network

Other Baths

  • Premium tile floors and quartz vanity counters
  • Showers with premium Italian tiled surrounds
  • Premium natural cherry vanity cabinets with full extension drawers
  • Large vanity mirrors
  • Premium Faucets and shower trim


  • Eco-friendly, recycled composite decking
  • Automatic drip system for container plants


  • Extra tall (8’) premium, carriage-style mahogany garage door with windows
  • Fully insulated, fully finished
  • Steel side door
  • Electric vehicle charger; pre-wired for 2nd
  • Lots of electrical receptacles and fluorescent ceiling lights
  • Space and electrical circuits for secondary refrigerator/freezer
  • Automatic garage ventilation system


* Zero Energy Guarantee:

-exclusive of grid connection fees & taxes; energy only

-exclusive of electric vehicle charging

-Energy Star appliances required

-exclusive of media and other special servers

-standard residential usages only …no grow lights! :)