Martha Rose Construction | City Cabins at Abott’s Alley

Location: Sedro-Woolley
Star Level: 5-Star, Net Zero Energy Label
Checklist: 2015 Single-Family/Townhome
Total Score: 837

Six live upstairs/work downstairs units located in the rural community of Sedro-Woolley.

Built Green Highlights

• Site and Water

  • 40% void infiltration bed below development manages 100% of stormwater onsite

  • New landscaping emphasized native vegetation

  • Existing vegetation that was removed was replanted or donated for reuse

  • No turf grass

  • Pesticide-free integrated pest management plan

  • Low-flow plumbing fixtures

  • High efficiency 0.8 GPF toilets

  • Main floor is an accessible studio/commercial space

• Energy Efficiency

  • HERS index -10

  • 120% better than code, Net Positive Energy!

  • 100% electric, fossil-fuel free operations

  • 9.9 kW solar PV on each unit

  • EV charging ready

  • Energy Star and DOE Zero Energy Ready Home certified

  • R-20 sub-slab insulation

  • Blown-in cellulose walls and ceiling (~85% recycled content)

  • Blower door score of 1.2 ACH

  • "Martha Wall" utilizes 1" of closed-cell foam under the exterior plywood for continuous thermal break

• Health and Indoor Air Quality

  • EPA Indoor airPLUS certified

  • No carpet in the units

  • No garages

  • All paints, finishes, and materials are low-VOC and NAUF

  • Roof overhangs of 24” and 36”

  • Heat recovery ventilators with ECM motors

• Materials Efficiency

  • Deconstructed existing 600 SF house and reused onsite salvaged materials

  • Used locally salvaged lumber for concrete forms, siding, and finish shelving

  • Interior walls designed for flexible spaces

  • Abundant use of local and regional materials

  • Polished concrete slab floor

  • Cork stair treads

  • Metal siding installed

  • Pantry with open shelves, cabinets, and counters using local, recycled materials and some steel

  • Reclaimed diamond blocks for landscape walls