A backyard greenhouse is usually allowed in residential zones as an accessory structure, while a commercial greenhouse usually needs agricultural zoning. Setbacks, size and lot coverage limits apply either way, even when the greenhouse is small enough to skip a building permit.
New to zoning types? Read what agricultural zoning means and what it allows.
A - Agricultural
or
R - Residential
Is a greenhouse allowed in Columbus?
Open the Columbus zoning map to find a property's zoning district, then check what that district allows.
Check zoning in Columbus, OH →Usually, yes. Building codes treat a greenhouse as a structure, and zoning codes treat a backyard greenhouse as an accessory structure, in the same group as sheds and detached garages. Under the International Building Code, a greenhouse that isn't classified as another occupancy is Group U, utility and miscellaneous.
Whether it counts as permanent depends on how it's built. A kit on a concrete slab or block foundation is usually treated as a permanent structure. A small portable hoop house with no foundation may fall outside some rules, though setback and size limits often still apply.
It depends on size and your local code. The International Residential Code, which many cities adopt, exempts one-story detached accessory structures up to 200 square feet from a building permit. Some cities lower that limit, and electrical, plumbing or gas work for heaters and fans usually needs its own permit even when the structure doesn't.
Skipping the building permit doesn't skip zoning. A permit-exempt greenhouse still has to meet setback, height and lot coverage rules.
Accessory structures in residential zones usually have their own setbacks, often smaller than the house's. Many codes keep them out of the front yard entirely and allow them closer to side and rear lot lines. Taller or larger structures often have to sit farther back.
The setback calculator checks a planned spot against your district's numbers, and the lot coverage calculator shows whether the greenhouse pushes your lot past its coverage limit.
An HOA can be stricter than the city. Covenants may require architectural review for any outbuilding, limit its size or materials, or ban structures visible from the street. Get written HOA approval before you order a kit, since the city's sign-off doesn't override a private covenant.
Growing plants for sale is an agricultural use, and the agricultural zoning guide explains why large greenhouse operations usually sit on farmland. Some codes also allow production greenhouses in light industrial zones.
Selling to the public changes things. A retail garden center is often a separate commercial use, and some agricultural districts allow growing but limit on-site sales. Selling a few plants from a home greenhouse may fall under the home business rules instead. Cannabis greenhouses follow their own licensing and zoning rules in states where cultivation is legal.
Swapping a garage roof for clear panels or adding grow lights changes the structure and its electrical load, so it often needs a permit. Some cities also require a set number of covered parking spaces, so converting the only garage can create a parking problem. To see your district's rules, search for your city's zoning map.
"Planning permission" is the UK term. In the US, a greenhouse needs to meet your zoning district's accessory structure rules, plus a building permit if it's over your city's size limit.
Rarely. Most residential codes bar accessory structures in front yards, so a front yard greenhouse would usually need a variance.
Usually, yes. An attached greenhouse counts as an addition to the house, so it typically must meet the house's setbacks and needs a building permit regardless of size.
It can. A permanent greenhouse on a foundation may be assessed as an improvement, while portable hoop houses often are not. Ask your county assessor how they treat them.