ADUs & casitas · Modern
The Mueller ADU: 22 x 30 One-Bedroom Backyard ADU Plan
The Mueller ADU is a 660 sq ft modern one-bedroom backyard ADU plan with an eat-in kitchen, a bath with a tub, a laundry room and a covered porch, on a 22 x 30 ft slab.
- 660sq ft
- 1bedroom
- 1baths
- 1level
- 30' x 22'footprint
Inside The Mueller ADU plan set
Preview each drawing before you buy. The full set adds every dimension, the door, window, panel and fixture schedules, framing details and the Texas code notes on each sheet.
| Room | Size | Area |
|---|---|---|
| Living | 15'-0" x 12'-0" | 180 sq ft |
| Kitchen / Dining | 15'-0" x 12'-0" | 180 sq ft |
| Bedroom | 13'-0" x 10'-0" | 130 sq ft |
| Hall | 3'-0" x 10'-0" | 30 sq ft |
| Bath | 8'-0" x 10'-0" | 80 sq ft |
| Laundry | 6'-0" x 10'-0" | 60 sq ft |
- 125Aelectrical service
- 14circuits on the panel schedule
- 3ceiling fans
- 1.5 tonheat pump, 2 heads
- 6plumbing fixtures
- 12 DFUdrainage fixture units
- 3"building drain
- Tankelectric water heater
Loading 3D model…
Drag to rotate, scroll or pinch to zoom. The download includes this model as an OBJ file for SketchUp, Blender or Revit.
Sheets in the drawing set
- A0.0 Cover Sheet & Project Data
- A1.0 Floor Plan & Schedules
- A2.0 Exterior Elevations
- A3.0 Building Section & Assemblies
- S1.0 Foundation Plan
- S2.0 Roof Framing Plan & Headers
- E1.0 Electrical Plan & Panel Schedule
- P1.0 Plumbing Plan & Fixture Schedule
- G1.0 Materials List
- G2.0 Cost Estimate
Files in your download (1.2 MB zip)
- README.txt3 KB
- The-Mueller-ADU-Construction-Drawings-24x36.pdf148 KB
- The-Mueller-ADU-CAD-Drawings.dxf172 KB
- The-Mueller-ADU-Materials-List.csv10 KB
- The-Mueller-ADU-Cost-Estimate.csv1 KB
- 3D-Model/The-Mueller-ADU.obj138 KB
- 3D-Model/The-Mueller-ADU.mtl1 KB
- Images/ (11 PNG renders and drawings)1.1 MB
Floor plan highlights
- The porch opens into a living room that flows into the eat-in kitchen.
- The bedroom, bath and laundry line the back of the house off a short hall.
- The low 4:12 roof keeps the height down, which helps with ADU height limits.
- Big enough to live in full time, small enough for most city lots.
Key features
- Modern one-bedroom ADU with a low metal roof
- Bath with a tub
- Laundry room with a back door
- Eat-in kitchen
- Covered porch at the entry
Texas tip: Austin's HOME code changes made backyard units like this easier to permit; confirm the current rules for your lot.
Plan specifications
| Total living area | 660 sq ft |
|---|---|
| Bedrooms | 1 bed |
| Bathrooms | 1 bath |
| Levels | Single level |
| Footprint | 30' x 22' |
| Overall height | 13' 6" |
| Ceiling height | 9' flat |
| Roof | 4:12 gable, standing-seam metal |
| Exterior walls | 2x6 wood framing, fiber-cement lap siding |
| Foundation | Stiffened slab-on-grade for expansive clay (verify with a geotechnical report) |
| Electrical | 125A, 14 circuits |
| Heating & cooling | Ductless heat pump, 18,000 BTU, 2 zones |
| Windows / doors | 10 windows (SHGC 0.25 max.), 5 doors |
| Files included | PDF drawing set, DXF (CAD), CSV, OBJ (3D), PNG |
Design-build in Texas
Have Cowboy Tiny Homes build it
We build our plans across San Antonio, Austin, Dallas, Fort Worth, Houston and rural Texas: site visit, permit drawings sealed by a Texas engineer where required, the slab designed from your geotechnical report, and construction by one team.
Build it with us: if Cowboy Tiny Homes builds this home for you under a contract signed within 12 months of your purchase, we credit the full plan price toward the build.
- Free consult We look at your land, budget and timeline.
- Site & feasibility Zoning, utilities, soils and, on the coast, windstorm rules.
- Permit set We adapt this plan to your lot and get it engineered.
- Build One crew from slab to move-in.
What will The Mueller ADU cost to build in Texas?
Built from this plan's own 121-line materials takeoff plus labor by trade, then adjusted for each Texas market. Pick your area and finish level.
Excludes land, utility connections, driveway, the geotechnical report and engineering. Coastal sites add windstorm upgrades. A planning estimate, not a bid.
The Mueller ADU materials list
Every plan set includes a 121-line takeoff with quantities, units and prices, ready to send to a lumberyard for a quote. The summary by category:
| Category | Lines | Includes | Materials |
|---|---|---|---|
| Site & foundation | 9 | Ready-mix concrete, 3,000 psi; Excavation, grading and haul-off; Select fill, PI 7-20, compacted… | $10,289 |
| Framing & sheathing | 13 | Pre-engineered roof trusses, 4:12, 22 ft span, @ 24 in. o.c.; 2x6 studs, 9 ft , exterior walls @ 16 in. o.c.; Radiant-barrier roof sheathing, 7/16 in. foil-faced OSB, 4 x 8… | $10,299 |
| Roofing | 7 | Standing-seam / exposed-fastener metal roofing panels with trim; Gutters 5 in. K-style with downspouts; Synthetic underlayment, 10 square roll… | $7,170 |
| Windows & doors | 12 | Vinyl single-hung / slider window, low-E, U-0.30 / SHGC 0.25 max., 3'0" x 5'0"; Exterior prehung door 36 x 80 in., fiberglass, half-lite, with lockset & deadbolt; Vinyl single-hung / slider window, low-E, U-0.30 / SHGC 0.25 max., 3'0" x 3'0"… | $6,477 |
| Exterior finish | 5 | Exterior fiber-cement lap siding; Corner boards, window/door trim 1x4 / 1x6; Soffit & fascia, vented… | $5,308 |
| Insulation | 4 | Wall insulation R-21 batts or mineral wool; Attic insulation R-38 blown cellulose / fiberglass; Acoustic batts at bedroom and bath walls… | $2,239 |
| Drywall & paint | 4 | Drywall 1/2 in. drywall, 4 x 8; Interior primer + 2 coats paint; Joint compound, tape, corner bead and screws… | $3,016 |
| Flooring & trim | 6 | Luxury vinyl plank flooring, waterproof, 20 mil; Porcelain tile floor + shower walls, thinset, grout, backer board; Door & window casing / stool… | $4,467 |
| Cabinets & counters | 5 | Base cabinets, shaker, RTA/stock; Countertop, quartz or butcher block; Bathroom vanity with top… | $6,105 |
| Electrical | 26 | Meter base, service entrance cable, ground rods & bonding; Ceiling fan with LED light kit, 52 in., Energy Star, on fan-rated box; Breakers: combination AFCI / dual-function… | $4,356 |
| Plumbing | 16 | Water heater, 40-50 gal electric or heat-pump; Bathtub 60 in. alcove + valve/trim; Kitchen sink, stainless + faucet + disposal… | $3,875 |
| HVAC & ventilation | 5 | Multi-zone ductless heat pump, 18,000 BTU outdoor unit + 2 heads , with line sets; Spot ERV / balanced ventilation; Range hood, ducted to exterior, with wall cap… | $5,070 |
| Appliances | 6 | Refrigerator; Range / induction cooktop; Dryer… | $4,560 |
| Fasteners & misc. | 3 | Dumpster / waste haul-off; Temporary power, portable toilet and tool rental; Framing nails, structural screws, connectors, construction adhesive | $2,333 |
| Total materials | 121 | $75,564 |
Built for Texas
Building an ADU in Texas
Texas cities that regulate building adopt the International Residential Code (IRC) with local amendments, and each city writes its own ADU rules: maximum size, height, setbacks, parking, utilities and whether the owner must live on site. Austin, San Antonio, Dallas, Fort Worth and Houston all allow accessory units in some form, with different limits. Confirm with your city before you buy. See the Texas tiny house laws guide.
Permits, stamps and engineering
The drawing set is organized the way Texas building departments expect: a cover sheet with code, load and climate notes, plans, elevations, a section, the slab, framing, electrical and plumbing. These are planning drawings, not stamped construction documents. Many cities, lenders and insurers will ask for a Texas-licensed engineer's or architect's seal, a site plan and energy-code forms, so plan for that review before you build.
- Cooling-first designDrawn for IECC climate zones 2 and 3: radiant-barrier roof deck, R-38 attic, R-21 walls, windows with SHGC 0.25 or less, 18 in. overhangs, shaded porches, ceiling fans and ductless heat pumps sized room by room.
- Expansive clay soilsThe slab is drawn as a stiffened slab-on-grade with 12 x 24 in. grade beams for moderate soils. Get a geotechnical report for your lot; a Texas-licensed engineer finalizes the slab (or a post-tensioned design) from it.
- WindFramed for 115 mph design wind (inland Texas, Exposure B) with a continuous load path. Houston-area and Gulf Coast sites need an engineer's wind upgrade, and sites in the TDI catastrophe area need Texas Department of Insurance windstorm certification.
- TermitesTexas is a very heavy termite area: the plans call for soil treatment or a barrier, treated sill plates and siding kept 6 in. above grade.
Similar Texas house plans
The Mueller ADU FAQs
What comes with The Mueller ADU plan set?
One zip file with a 10-sheet construction drawing set (24 x 36 in. PDF: cover with Texas code notes, floor plan, elevations, section, foundation, roof framing, electrical, plumbing, materials list and cost estimate), a DXF CAD file, the materials list and cost estimate as spreadsheets (CSV), a 3D model (OBJ) and PNG images.
Will Cowboy Tiny Homes build The Mueller ADU for me?
Yes. We build our plans across Texas. Build it with us: if Cowboy Tiny Homes builds this home for you under a contract signed within 12 months of your purchase, we credit the full plan price toward the build. Ask for a build quote.
How do I get the files after I pay?
Right away. After checkout you land on a download page, and we email the same link. It works for a year and up to 25 downloads, and you can get a fresh link at Find my plan download.
Are these plans stamped or permit-ready in Texas?
No. They are planning and permit-development drawings, not stamped documents. Texas cities that require a permit review plans under the IRC with their own amendments, and many want a Texas-licensed engineer's seal, especially on the slab and on coastal wind design. We can arrange that, or your own engineer or architect can review and stamp the set.
Does The Mueller ADU work on the Gulf Coast?
With an upgrade. The plans assume 115 mph inland design wind. Houston-area and coastal sites need engineered wind design, impact-rated or protected windows, and, inside the Texas Department of Insurance catastrophe area, TDI windstorm certification (WPI-8).
Can The Mueller ADU be modified?
Yes. We can flip the layout, change room sizes, swap the slab for pier-and-beam, or add a porch. Ask for a modification quote.
What does the license allow?
Your purchase includes a license to build one home from the plan. You can print and share the drawings with your builder, lender and permit office for that build. See the terms of sale.
Build The Mueller ADU in Texas
Talk with Cowboy Tiny Homes about building this plan on your land, or tailoring it to fit. Free consultation.