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Building Permit Bylaws in London

building permit

Straight from the London.ca website: If you are unsure of any project or it’s dimensions, contact the city.

Building Permits: When is a Building Permit Required?

A building permit is required for any new building greater than 10m2 (108 sq ft), any addition to an existing building, any material alterations to an existing building which affects: the structural design of the building; mechanical; plumbing services (no limit on size of building); and the use
of buildings or parts thereof.


What Projects Require a Building Permit?

– decks greater than 600mm (24 inches) above ground or serving the principal entrance for dwelling units
– interior structural alterations
– adding or removing walls (i.e., creating different room sizes and/or uses)
– porches
– basement or main floor walkout alterations
– additions / sunrooms / solariums
– replacement of brick veneer or installation of new brick veneer
– carports
– attached or detached garages, sheds
– replacement of masonry chimney (below roofline)
– dormers or finishing of attic space
– installation or repair of storm, sanitary and water service
– finishing a basement or a portion thereof
– furnace and ductwork replacement or relocation
– installation of plumbing cleanouts
– conversion from septic to sanitary sewer
– plumbing and/or drains (except replacing fixtures)
– insulating exterior walls when exterior or interior cladding is removed
– new or structural alterations to windows or doors
– installation or repair of private sewer systems and water service
– installation of backflow preventers for lawn irrigation systems
– structural work related to fire damage

What Projects Require a Building Permit? (cont’d)

– solar panels that are mounted on a building and have a face area equal to or greater than 5m2
– Installation of new or replacement of weeping tile

What Projects DO NOT Require a Building Permit?

– fences (other than for swimming pools in which case a pool fence permit is required)
– decks not forming part of a principle entrance to a dwelling unit and less than 600mm (24 inches) above grade at all points
– asphalt roof shingling
– eaves troughs
– minor repairs to masonry
– damp proofing basements
– air conditioning units or heat pumps added to existing forced-air systems
– replacement of kitchen or bathroom cupboards without plumbing alterations
– replace existing forced-air furnace (no duct work alterations)
– replacing siding or windows (provided there are no structural changes)
– pool heaters
– painting and decorating
– landscaping

If you have any questions or are unsure of whether your project needs a permit, contact the Development and Compliances Building Division at 519-661-4555 or visit london.ca for more information.