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Custom Sheds &
Backyard Offices
in Any Size
Offices, studios, workshops and sheds designed for your yard and built on site
across Greater Seattle, in a size that fits your space and your needs.
Built to Your Size, Not a Catalog
Our three models are starting points. You can change any of them or start from a blank page: choose the width, depth and wall height, the windows and doors, and the finishes inside and out. We design it for your yard and build it on site.
Backyard offices
Insulated, wired and finished inside, from a one-desk office to a room for client meetings.
Studios & gyms
Big windows or glass doors, open floor space and power where you need it.
Sheds, workshops & barns
Storage, a woodshop or a barn-style building, with wide doors and a loft on request.
Shed Size Guide: Common Sizes at a Glance
A quick guide to popular sizes and how people use them. We can build your shed or office in any width and depth that fits your yard.
Permit tags: typical for Greater Seattle cities; Seattle is stricter. We check your city first.
Garden tools, bikes and a push mower
Usually no building permitStorage with a small potting bench
Usually no building permitA compact office for one, or storage
Usually no building permitOffice with shelving and a reading chair
Usually no building permitOffice with storage, or a small studio
Usually no building permitOffice with a seating corner, small gym
Usually no building permitStudio, home gym or guest room
Usually no building permitStudio with storage, hobby room
Building permitWorkshop, or studio with storage
Building permitLarge studio, golf simulator
Building permitWoodshop or equipment storage
Building permitLarge workshop or multi-use studio
Building permitShed Size by Square Feet
| Area | Size (ft) | Good for | Permit* |
|---|---|---|---|
| 80 sqft | 8x10 | Garden tools, bikes, push mower | Usually none |
| 96 sqft | 8x12 | Storage with a potting bench | Usually none |
| 100 sqft | 10x10 | Small office or storage | Usually none |
| 140 sqft | 10x14 (14x10) | Office with shelving | Usually none |
| 144 sqft | 12x12 | Office with storage, small studio | Usually none |
| 150 sqft | 10x15 (15x10) | Office with a reading corner | Usually none |
| 160 sqft | 10x16 (16x10) | Office + seating, small gym | Usually none |
| 192 sqft | 12x16 (16x12) | Studio, gym, guest room | Usually none |
| 224 sqft | 14x16 (16x14) | Studio with storage, hobby room | Required |
| 240 sqft | 12x20 (20x12) | Workshop, larger studio | Required |
| 256 sqft | 16x16 | Large studio or workshop | Required |
| 280 sqft | 14x20 (20x14) | Large studio, golf simulator | Required |
| 288 sqft | 12x24 (24x12) | Woodshop, equipment storage | Required |
| 320 sqft | 16x20 (20x16) | Large workshop or studio | Required |
*Building permit for a one-story detached building in most Greater Seattle cities. Electrical work always needs an electrical permit.
What Size Do I Need?
Size and Permits
Many Greater Seattle cities exempt one-story detached buildings up to 200 sqft from a building permit; Seattle is stricter. Electrical work always needs an electrical permit. Bigger buildings need a building permit: we prepare the plans and handle it.
Tell us the size
Your idea of the size and use, or just the space you have. We visit and measure.
Design & quote
Layout, windows, doors and finishes, with a line-item quote.
Permits
We check your city’s rules and handle the permits where they’re needed.
Built on site
Our crew builds it in your yard: about 2–4 weeks for sheds and barns, 3–5 weeks for offices.
Looking for 10x12, 13x15 or 10x20? Start From a Model
Each model is a starting point: we can change its size, windows, doors and finishes.
Office Pod 10x12
120 sqftOur most compact office: a full desk setup, a door that closes and light from two sides.
View Office Pod 10x12 →
Studio Shed 13x15
195 sqftA mid-size studio with a 12 ft sliding door: an office, a home gym or a creative space.
View Studio Shed 13x15 →
Luxury Office 10x20
200 sqftOur largest model: eight windows, a wide French door and room for client meetings.
View Luxury Office 10x20 →Custom Size FAQ
Size limits and permits differ by city. We check the rules for your address before we design.
Can you build a shed or office in any size?
Yes. Every SDEK building is designed for your yard, so the width, depth and height are up to you, along with the windows, doors, siding and roof.
What size shed can I build without a permit in Washington?
It depends on your city. Many Greater Seattle cities exempt one-story detached buildings up to 200 sqft from a building permit; Seattle is stricter. Electrical work always needs an electrical permit. We check your city’s rules first.
What size shed do I need for a riding lawn mower?
An 8x10 shed (80 sqft) fits a riding mower and basic garden tools; an 8x12 or 10x10 adds room for a workbench or bikes. Plan a double door wide enough to drive through, and a ramp if the floor sits above the ground.
What size shed do I need for a home gym?
Most home gyms fit in 160–192 sqft, for example a 10x16 or 12x16 shed: room for a rack or a treadmill, free weights and space to move. Plan a higher ceiling for overhead lifts.
Can a custom backyard office have a bathroom?
A building with a bathroom, kitchen and sleeping area is a dwelling unit (a DADU), with different permits and rules. We build those too: see our DADU Builder page.
GET IN TOUCH
Tell us the size you have in mind, or just the space you have, and get a pricing outline and next steps for your backyard building.