This is an Amend demo — a Hollow & Stone owner portal, white-labeled and two years lived-in.
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H
Hollow & Stone Owner Portal
CM
Cate & Marcus
!
Two things, while you're in Brooklyn.  Snow forecast for the Hollow this weekend (8–14"). The hydronic loop is set for arrival; we've staged a plow visit for Saturday morning so the drive is clear when you pull in.
Year Two · In Residence

The Catamount House

A contemporary timber-frame on twelve wooded acres in the Catskills — built off-grid-ready, kept from a phone in Brooklyn.
Built
2024
Floor area
3,800sf
Land
12.4acres
Performance
Net ZeroPhius design
42.0500° N   74.2500° W
Off-Grid Ready

This month

Energy Performance · Last 30 Days
Top 3% nationally
+128%
net produced
You generated 1,612 kWh and used 1,260 kWh. The surplus has been credited back through Central Hudson; the three Powerwalls discharged to grid two nights last week during the regional peak.
average Hudson Valley home
Indoor Air
Excellent
486 ppm CO₂
PM2.5 avg 2 µg/m³ · RH 39%
Battery · 3× Powerwall
91% · grid up
37.2 kWh stored
~42 hours autonomy at this load
Cistern & Well
Well producing
2,840 gal
Well rest depth 28' · last test Apr 14

Recent activity

May 21
!
Plow visit confirmed — Sat 7 AM.  Northland Property Care will clear the drive and the heat-pump pads before you arrive. We've left a key for the mud-room door.
View
May 18
Zehnder ERV — spring service complete.  Cole Mechanical. Recovery efficiency holding at 86% (above design).
Report
May 15
Arrival prep ran on its schedule.  Heat set 68°, hot water tank pre-heated, water-leak sensors armed. No anomalies overnight.
Settings
May 09
Spring bloom note from Hollow & Stone.  Bill walked the property after the last rain — the trillium are out along the north path, the meadow needs a single mow before the natives come up.
Read
Apr 24
Two-year systems performance review from Hollow & Stone. Every spec held; the larch siding has silvered 8% darker than the model predicted on the south face.
Open
Apr 12
Storm rode through · all systems held.  Central Hudson was down 4h 22m. Battery carried the home; freezer never crossed 11°F.
Log

The house, as it is

Systems & materials

Mechanical · Ventilation
Zehnder ComfoAir 550
86% recovery
Energy recovery ventilator · sized for 3,800 sf · climate 5B
Filter
F7 / G4
Next service
Oct 2026
Warranty
10y · 8y left
Installer
Cole Mechanical
Mechanical · HVAC
Mitsubishi Hyper-Heat VRF
+2°F outdoor min
PURY-HP60 · 5-ton multi-zone · cold-climate variant rated to -13°F
HSPF
12.5
Heads
6 indoor
Warranty
12y compressor
Installer
Cole Mechanical
Mechanical · Hydronic
Radiant Floor · Slab + Upper
Loop pressure 18 PSI
Uponor PEX in slab + upper-level joist bays · powered by heat pump via buffer tank
Zones
8 zones
Buffer
80 gal · 120°F
Manifold
Caleffi · BoH
Installer
Cole Mechanical
Electrical · Generation
Enphase Solar Array
4.6 kW · midday
IQ8M microinverters · 40 panels · 16.0 kW · ground-mount in the south meadow
Tilt
South · 35°
Lifetime
24,180 kWh
Warranty
25y panel + inv.
Net meter
Central Hudson
Electrical · Storage
Tesla Powerwall 3 · ×3
91% · 37.2 kWh
Three Powerwall 3 units, AC-coupled · 40.5 kWh total · whole-home backup & arbitrage
Capacity
40.5 kWh
Backup mode
Whole-home
Outages caught
7 · 2 yr
Installer
Brightline Electric
Electrical · Distribution
SPAN Smart Panel
200A main
SPAN Panel 2 · 32-circuit smart panel with per-circuit metering & remote shed
Circuits
32 · main + studio
EV charger
Wallbox 240V
Warranty
10y · 8y left
Installer
Brightline Electric
Envelope · Glazing
Alpen 925 Tilt-Turn
U-0.16
Triple-pane argon-fill · 29 units · fiberglass frame, black-aluminum exterior
U-value
0.16
SHGC
0.32
Warranty
20y · 18y left
Color
Coal black ext.
Envelope · Cladding
European Larch Rainscreen
Re-oil 2028
Vertical larch board-and-batten · raw, silvering naturally · stone chimney mass at south face
Profile
1×6 vertical
Finish
Raw · weathering
Source
Adirondack mill
Silvered
South 38% · 2 yr
Water · Well
Drilled Well · 380 ft
28' rest depth
380 ft drilled well · 8 gpm sustained · pressure tank in mechanical room + UV + sediment filtration
Depth
380 ft
Yield
8 gpm
UV bulb
Replace Q1 2027
Last test
Apr 14 · clean
Water · Cistern
Rainwater Cistern
76% · 2,840 gal
Below-grade concrete cistern · 3,750 gal · feeds irrigation, toilets, and the outdoor hose loop
Capacity
3,750 gal
Filtration
5 µm · UV
Captured YTD
11,420 gal
Installer
Driscoll & Sons
Water · Septic
Sand-filter Septic
Pump Q3 2028
1,500 gal concrete tank + sand-filter bed · timed-dosing pump · alarmed for high water
Tank
1,500 gal
Bed area
900 sf
Next pump
Q3 2028
Installer
Driscoll & Sons
Network · Redundant
Starlink + Verizon Fiber
Both up
Verizon FiOS primary + Starlink failover · UniFi router with health-based switching
Primary
FiOS 940 Mbps
Backup
Starlink
Switchover
< 8 sec
Managed by
Hudson Valley MSP

Construction memory

Every wall in the house was photographed before drywall went up, and every panel of larch was numbered. Years from now — when you want to hang a sconce, run a line, or open a wall — these images will be waiting for you.
Mar 14, 2023 — Design begins
First sketches at the kitchen table

Bill McKnight at Hollow & Stone took the first run at the floor plan from a sketch you'd brought from Brooklyn — a great room oriented south, a primary bay set behind it, a studio thirty feet off the house. Five revisions over six weeks before the slab outline locked.

Jul 09, 2023 — Site preparation
First cut, around the old maple

Clearing was confined to the 38-yard slab footprint plus the meadow for the ground-mount solar. The 130-year-old sugar maple at the southeast corner was kept — its drip line shapes the trellis at the entry today.

Sep 22, 2023 — Foundation
Slab, hydronic loops, sub-slab EPS

6" of EPS foam beneath the slab — generous for climate 5B and essential for the radiant strategy. Hydronic loops were laid in eight zones; the polished finish would later become the finished floor on the main level.

Feb 06, 2024 — Wall assembly
Walls open · what's behind your drywall

The reference set — every interior wall photographed from both sides before insulation and drywall. Tagged with stud locations, plumbing runs, electrical chases, and the cedar blocking placed for future fixtures. The reading bay studs are 4×6, by request, for a future built-in.

Open the wall map →
Mar 19, 2024 — Blower door
Air-tightness test passed

Result: 0.46 ACH₅₀ — inside Passive House territory, well clear of the design target of 0.60. Bill was on site with the rater; no significant leakage anywhere on the envelope.

Apr 04, 2024 — Cladding
Larch goes up, board by board

European larch from an Adirondack mill, vertically applied. Each board photographed before install and tagged in the panel map — when one needs replacement years from now, the right board comes from the same lot. The mill saved 18 spare boards for you; they're stacked in the studio loft.

Jun 21, 2024 — Move in
Keys and a bottle of cider

The walkthrough was logged in 54 stops across the house and the studio. Every system demonstrated. The closing gift was a bottle of Awestruck cider from the Hudson Valley and a hand-bound book of the build — the same book that now lives on this portal.

Care & maintenance

2
Action this week
4
Coming this season
17
On the year ahead

Upcoming

Sat · May 24
Plow visit before your arrival Northland Property Care · 7 AM · clearing drive + heat pump pads
As-needed
Sun · May 25
Open the cistern for the season Switch from winter bypass to active rainwater capture — 5 minutes, in the mechanical room
Seasonal
In 3 wks
Inspect exterior caulking Window jambs and door thresholds — annual visual after winter
Annual
June
Meadow first mow + native survey Catskill Native Land Care — pollinator strips marked; only mow paths
Seasonal
July
UV bulb · cistern + well Replace both UV bulbs · 30 min · DIY guide attached
Annual
August
Annual well water test Catskill Water Testing — bacteria, nitrate, pH, hardness
Annual
October
Heat pump pre-winter check Cole Mechanical — refrigerant pressures, coils, defrost cycle
Annual
November
Cistern winterize · drain & bypass Before first hard freeze · 20 min walkthrough
Seasonal

Documents & warranties

Build · As-built
As-built architectural set
Final drawings reflecting actual construction. Structural, mechanical, electrical, and millwork revisions logged through the build.
PDF · 72 pp Open →
Build · Air tightness
Blower-door & energy model
0.46 ACH₅₀ result, PHIUS-aligned design energy model, final commissioning of HVAC + ERV + radiant.
PDF · 24 pp Open →
Property · Title
Survey, deed, easement
Twelve-acre boundary survey, recorded deed, conservation easement on the back forty (no further subdivision).
PDF · 18 pp Open →
Owner · Reference
The Catamount handbook
A custom-written manual for this home — written by Hollow & Stone, specific to this build. Open / close, lighting scenes, what each switch does.
PDF · 92 pp Open →
Equipment · Manuals
Equipment library
Every appliance, fixture, and piece of equipment in the home, with model number and PDF manual. Searchable.
47 items Browse →
Finish · Reference
Paint, stain & finish schedule
Every color, finish, and material in the home — keyed to room and surface, with touch-up sources and the lot numbers for the larch.
PDF · 14 pp Open →
Water · Well log
Well log & water tests
380 ft drilled well · driller's log · two years of annual water tests, all clean.
PDF · 12 pp Open →
Utility · Net meter
Central Hudson interconnect
Net-metering agreement for the 16 kW array; current credit balance and the NY-SUN incentive paperwork.
PDF · 8 pp Open →
Land · Conservation
Conservation easement
Forest stewardship plan + the recorded easement on the back eight acres. Includes the agreed trail network and the no-disturb deer wintering yard.
PDF · 22 pp Open →

Active warranties

Item
Coverage
Time remaining
Roof — standing seam steel
Dark bronze · McElroy
40 yr finish · lifetime structural
38 yr left
Solar array
Enphase IQ8M · 40 panels
25 yr panel · 25 yr inverter
23 yr left
Powerwall ×3
Tesla · 10 yr full
10 yr capacity + cycles
8 yr left
Heat pump · Mitsubishi VRF
PURY-HP60
12 yr compressor · 7 yr parts
10 yr left
Windows · Alpen 925
29 units · triple-pane
20 yr seal · 10 yr hardware
18 yr left
Builder structural
Hollow & Stone
10 yr full structural
8 yr left

The people who built & care for your home

H
Builder · Primary
Bill McKnight
Hollow & Stone · Kingston, NY
Bill founded Hollow & Stone and led the Catamount build from first sketch to handover. He sees this as a 30-year relationship — not a closed contract. Reach out for anything, including the things that don't seem like his problem.
M
Mechanical · ERV + HVAC + hydronic
Cole Mechanical
Saugerties, NY · 16 mi away
Installed and services the Mitsubishi heat pump, Zehnder ERV, and the eight-zone radiant system. Annual service plan active through June 2027.
B
Electrical · Solar & service
Brightline Electric
New Paltz, NY · 22 mi away
Wired the entire home and the studio, installed the SPAN panel, the three Powerwalls, and the ground-mount Enphase array. Keeps records of every circuit they ran here.
D
Water · Well, cistern, septic
Driscoll & Sons
Margaretville, NY · 19 mi away
Installed the well, cistern, septic, and all interior plumbing. Three generations of plumbers in the Catskills; they know which water lines run under the slab and why.
N
Property care · Year-round
Northland Property Care
Phoenicia, NY · 11 mi away
Snow removal, walk-throughs while you're in the city, package handling, the standing arrangement for arrival prep. They know the gate code, the dog code, and the alarm code.
C
Landscape · Native
Catskill Native Land Care
Woodstock, NY · 14 mi away
Designed the native border and the pollinator strips. Knows which trees and shrubs were preserved and why. On a seasonal rotation; mows only the paths.
+
Need a recommendation?
Builder-vouched directory
Carpenters, masons, arborists, foresters, more
Hollow & Stone keeps a small list of trades who understand high-performance homes built in the Catskills. Borrow from their network.
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The Catamount House · Year Two