Gutted bathroom rough-in with PVC stub-outs capped and subfloor exposed
← BEFORE
PVC stub-out — capped
⌀4″ drain — decommissioned
Subfloor — 3/4″ ply exposed
Finished composting toilet install with matte ceramic unit on new tile and clean vent stack
AFTER →
Vent stack — ⌀4″ PVC, 12 CFM fan
Sun-Mar Excel NE — 1.5 gal/day
12×24 porcelain tile — sealed grout

Waterless · Off-Grid · Code-Compliant

Where Septic Permits
Die on Arrival,
We Install.

Composting toilet installs for Ozark dry cabins, ADU conversions, and tiny houses. Every job documented with engineering callouts — so you trust the hands before you meet them.

Field Notes — Documented Installs

The work speaks
before we do.

Every install documented with engineering callouts, CFM ratings, and permit outcomes. Drag the handle — see the difference.

PROJECT 001 — CABIN RETROFIT

Single-Unit Dry Cabin

Ozark foothills, 340 sq ft

County said no. Perc test failed three times. The owner-builder had framed the whole cabin before realizing the ridge was solid limestone six inches down. No septic. No problem. One Sun-Mar Excel NE, a 4″ vent stack through the shed dormer, and a 12 CFM inline fan — total job time: 11 hours.

12 CFM fan1.5 gal/day capacity⌀4″ vent — 8 ft riseNEC 110V/15A circuit
Unfinished cabin bathroom with exposed subfloor and capped PVC stub-outs
← BEFORE
Limestone bedrock — 6″ down
Failed perc site — 3× rejected
Finished cabin bathroom with composting toilet installed and clean tilework
AFTER →
12 CFM fan — continuous draw
Sun-Mar Excel NE — 1.5 gal/day
PROJECT 002 — ADU CONVERSION

Garage-to-ADU

Suburban lot, no sewer stub

The permit office wanted a full sewer lateral — $18,000 and 6 weeks of street work. The homeowner called us instead. NSF/ANSI 41-certified unit, documented per local health code, permit pulled in 4 days. Tenant moved in on schedule.

NSF/ANSI 41 certified2.2 gal/day capacityPermit in 4 daysZero sewer tie-in
Unfinished garage space being converted to ADU with rough concrete floor
← BEFORE
Permit rejected — sewer lateral req.
Slab — no drain rough-in
Finished ADU bathroom with composting toilet and clean modern finishes
AFTER →
NSF/ANSI 41 — health code compliant
2.2 gal/day — 2-person household
PROJECT 003 — TINY HOUSE

THOW Pre-Inspection

24 ft trailer, county inspection Tuesday

Tuesday morning inspection. They called Friday afternoon. RV cassette was leaking, code officer had already flagged it. We sourced a Nature's Head unit overnight, installed Saturday, documented the full vent path Sunday. Inspector signed off at 9:14 AM.

Nature's Head unit⌀1.5″ vent — trailer roof48-hr turnaroundInspection passed
Tiny house bathroom with leaking RV cassette toilet flagged by code officer
← BEFORE
RV cassette — flagged by inspector
Code violation — leaking seal
Tiny house bathroom with Nature's Head composting toilet properly installed
AFTER →
⌀1.5″ vent — roof penetration sealed
Nature's Head — inspection passed
Cabin RetrofitADU ConversionTiny HouseHomesteadGlamping BathhouseOzark InstallOff-GridCode CompliantCabin RetrofitADU ConversionTiny HouseHomesteadGlamping BathhouseOzark InstallOff-GridCode Compliant

Technical Range

Simplest cabin to
full glamping bathhouse.

The range of work we document publicly is intentional — so you can see exactly where your project sits, and know we've done harder.

Small wooden off-grid cabin in forested Ozark setting at golden hour
Simplest

Single-Unit Cabin Retrofit

One composting unit, one vent stack, one day. The baseline install — perfected across 40+ Ozark cabins.

1 unit11 hr install4″ vent12 CFM
Modern tiny house on wheels parked on gravel pad surrounded by trees
Mid-Range

Full ADU / Tiny House

Two-person occupancy, permit documentation package, health code sign-off. We pull the permit.

NSF/ANSI 412-person loadPermit pkg48-hr turn
Permaculture homestead with raised garden beds and outbuildings at dusk
Complex

Homestead Multi-Bath

Multiple units, shared vent manifold, drum composter integration for the finishing pile. Full system design.

2–4 unitsShared manifoldDrum composterSystem design
Upscale glamping site with canvas tents and timber bathhouse structure
Most Complex

Glamping Bathhouse

Multi-stall commercial installation, 50+ guest-nights per week, NSF commercial certification, quarterly service contract.

6–12 stalls50+ guests/wkNSF commercialService SLA

Permits · Codes · Certifications

We pull the permit.
You move in on schedule.

Every install comes with a documentation package: unit spec sheet, vent path diagram, CFM calculation, and the applicable code section flagged for your inspector.

NSF/ANSI 41

Non-liquid saturated treatment works

IRC P2910

Composting toilet systems

UPC 723.0

Uniform plumbing code exception

IAPMO Z1000

Prefab composting toilet systems

States with active installs

ARMOOKKSTNTXCONM

140+

installs permitted

4 days

avg permit timeline

Not sure if your county will approve? We'll read the regs, call the office, and give you a straight answer — in 15 minutes.

Schedule — Site Walk

Let's walk the site
before we quote it.

15 minutes on the phone or a short video call — we'll tell you exactly what unit fits, what the permit path looks like, and what it'll cost.

Used to check local code requirements and schedule travel.

No obligation. We'll read your local regs before the call so you get a straight answer.