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Know what applies to your project.
Check the conditions below before you finalize the scope. Every answer connects to an official source.
Cambridge exempts a detached accessory structure of 15 square metres or less only when it is no more than one storey, storage-only and has no plumbing. Zoning and Building Code obligations still apply.
Source · City of Cambridge
Building Permits · Permit triggers for structures, garages, openings and retaining walls
Verified Oct 1, 2026Open official sourceMake a start
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Your next steps.
- Record the scope: outside floor dimensions and total floor area.
- Gather: number of storeys, intended use and plumbing.
- Compare the exact scope with this municipal statement: Cambridge exempts a detached accessory structure of 15 square metres or less only when it is no more than one storey, storage-only and has no plumbing. Zoning and Building Code obligations still apply.
- Ask which documents, fees and inspections apply to this exact scope; keep the written response with the project records.
- Resolve approvals before committing to a construction start date.
Trace the evidence
Official sources behind this guide.
These are the source documents linked in the rules above. Check the municipal authority for current requirements before submitting a project.
- City of Cambridge
Building Permits · Permit triggers for structures, garages, openings and retaining walls
Source verified Oct 1, 2026
A little more clarity
Common questions.
What should I ask before starting a shed project?
Does this exact size, use and construction qualify for an exemption, and where can it be placed?
Does this approve my property-specific project?
No. The published general guidance is verified; zoning, exact scope and other approvals still need to be resolved for your property.
Do you need a permit for shed in Cambridge?
Cambridge exempts a detached accessory structure of 15 square metres or less only when it is no more than one storey, storage-only and has no plumbing. Zoning and Building Code obligations still apply.
Know the zoning terms
The shed may be permit-exempt. The property rules still matter.
Placement, setbacks and lot coverage may still apply even where a shed is exempt from a building permit.
Setback
A setback is the required distance between a building or structure and a property line, street, another feature or another regulated reference point.
Lot coverage
Lot coverage is a zoning measurement describing how much of a lot is occupied by buildings or structures under the applicable municipal rules.
Zoning by-law
A municipal rule set that controls how land and buildings may be used and developed, including matters such as permitted uses, setbacks, height, lot coverage and other site-specific standards.
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