Why this site exists

Design My Backyard Studio was created around a simple observation: published studio prices often describe only one portion of the project, while homeowners want to understand what a finished, usable room may cost in their own yard.

The Cost Planner brings the major product, site, construction, and installation decisions into one transparent planning experience. It helps homeowners compare options, understand major cost drivers, and enter professional conversations better informed.

How the estimate works

  • Current manufacturer-published examples. Building-package and assembly allowances are calibrated against published shell-kit, installed-shell, and turnkey prices.
  • Structured assumptions. Every allowance is stored as data with a low and high value, not hidden in code.
  • Separate scope layers. Shell, installation, foundation, interior, systems, and permits are estimated separately so you can see where money goes.
  • Low/high ranges. Because allowances rarely all land at their extremes, the total half-width is the root-sum-square of the item ranges, widened by a safety factor, with a floor of 10% of the midpoint. Results are rounded to the nearest $1,000.
  • Site uncertainty. “Not sure” answers and conditions such as unknown soil add their full uncertainty to the high side of the range.
  • Regional assumptions. A ZIP code applies a broad regional labor adjustment to labor-heavy items; without one, a wider national adjustment is used.
  • Exclusions. Every result lists what is not included.
  • Source dates. Each source records the date it was last checked.
  • Model versioning. The current model is 2026.10-1. Saved projects keep the version they were priced with.
  • Periodic review. Pricing was last reviewed in October 2026.

The result is a planning estimate, not a contractor proposal.

Planning assumptions that are not from a single published source

Foundation, slope, access, trenching, interior finish, heating and cooling, permit, and regional allowances are planning assumptions. They reflect typical scopes for small detached rooms but are not measured market data and vary widely locally. The regional adjustment uses only the first digit of a ZIP code:

Applied to labor-heavy allowances only, never to the building package.
ZIP prefixRegionFactor range
0Northeast (New England, NJ, PR)1.08–1.20
1Northeast (NY, PA, DE)1.05–1.20
2Mid-Atlantic and Carolinas0.95–1.08
3Southeast0.90–1.03
4Great Lakes and Ohio Valley0.92–1.04
5Upper Midwest and Northern Plains0.93–1.06
6Central Plains0.93–1.05
7South Central0.90–1.03
8Mountain West0.97–1.12
9Pacific and West Coast1.10–1.32
NoneNational planning range0.90–1.25

Independence

Disclosure.Design My Backyard Studio is an independent planning and cost-estimation resource. We are not a studio manufacturer, architect, engineer, contractor, or permitting authority. Estimates are preliminary planning ranges, not bids or guaranteed prices. Final feasibility, zoning, permitting, engineering, site conditions, product selection, and pricing must be confirmed by qualified local professionals.

We are not paid by the manufacturers cited on this site, and citing a manufacturer is not an endorsement. If we ever introduce referral relationships, we will disclose them here, and we will share a request with a third party only when you have given separate permission to do so.

Published by Design My Backyard Studio.

Sources

  1. Kanga Room Systems published pricing by model and scopeKanga Room Systems · Manufacturer source · checked October 14, 2026Separate shell-kit, installed-shell, and turnkey prices for the same models. Modern Kwik Room 10×12: $18,900 shell kit, $24,700 installed shell, $40,600 turnkey. Modern 12×16: $22,800, $33,800, and $51,100. Cottage 12×16: $27,600, $43,900, and $62,200. The installed-shell option is offered in Texas only.
  2. Kanga Room Systems definitions of shell kit, installed shell, and turnkey scopeKanga Room Systems · Manufacturer source · checked October 14, 2026Shell kit covers core structural components, siding, and trim. Installed shell adds delivery and shell installation with the interior unfinished. Turnkey adds a finished interior and exterior. The page cites an 8–12 week delivery-and-installation window.
  3. Studio Home backyard studio models and starting pricesStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Signature model (80–240 sq ft) listed from $17,702 plus installation, and Portland model listed from $27,802 plus installation. The Signature is described as excluding assembly and site work.
  4. Studio Home Signature model specifications and inclusionsStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Sizes from 8×10 to 12×20. The finished-interior option is a separate selection with insulation, flooring, and an electrical package. Foundation, site work, and permit fees are the homeowner’s responsibility.
  5. Studio Home frequently asked questions on cost, permits, and lead timesStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Base shell kits run roughly $100–$140 per square foot depending on model and size, before site work and permits. Trenching and hookup to the home are the homeowner’s responsibility. Municipalities increasingly require permits for units with electrical.
  6. Studio Home on how backyard studio costs varyStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Cost depends on the specific design. Shipping is calculated separately. Foundations may be poured concrete or a self-supported joisted floor. Installation may be DIY or by a partner.
  7. Studio Home installation network overviewStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Assembly may be DIY or by an installer. Professional assembly may cover foundation preparation, panel assembly, and in some cases decks and interior finishes. Installation is priced separately from the building.
  8. Studio Home planning, permitting, and installation processStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Permitted projects move through a site visit, design, permitting (listed as 4–12 weeks), production, and installation (1–2 weeks). Permit fees are the customer’s responsibility. The foundation is estimated separately and must be ready before delivery.
  9. Studio Home online design centerStudio Home (formerly Studio Shed) · Manufacturer source · checked October 14, 2026Configured prices are shown in the manufacturer’s design tool, and starting prices are listed plus installation.
  10. Denver Community Planning and Development: residential shedsCity and County of Denver · Government source · checked October 14, 2026In Denver, the building-permit exemption applies only to one-story, detached, non-conditioned accessory buildings used for storage and similar uses, within 200 sq ft of roof area and height limits. Adding light, heat, or air conditioning may require trade permits, and a separate zoning permit may apply.
  11. San Mateo accessory building permit requirementsCity of San Mateo, California · Government source · checked October 14, 2026In San Mateo, a building permit is required for any storage shed or accessory building over 120 square feet, and placement within setbacks is restricted.

See all sources

Contact

General questions: [email protected]. Privacy and data requests: [email protected].