The honest answer most roofers won't give you: most roofs don't need an inspection every year. But every roof needs one at the right moments - and the cost of skipping those moments is rarely the inspection itself. It's the leak, the failed shingles, the rotted decking, or the dropped insurance claim that the inspection would have caught.

Here's a practical guide to inspection timing - by roof age, after triggering events, by season in the GTA, and by what kind of property you're responsible for.

The "ignore until it leaks" problem

The cheapest moment to find a roof problem is before it becomes one. The most expensive moment is after the ceiling drywall is wet.

A small flashing failure caught early might be a $300 repair. The same failure caught two years later, after water has been wicking into the decking through every freeze-thaw cycle, can be a $4,000 repair plus drywall, plus paint, plus mould remediation. Reactive maintenance is one of the most expensive habits in homeownership and property management, and roofs are where it shows up worst - because most roof problems are invisible from the ground until they're already serious.

Routine inspection is cheap insurance. The question isn't whether to inspect, but how often.

Routine inspection intervals by roof age

Asphalt shingle roofs - the most common in the GTA - have a typical service life of 20 to 30 years depending on quality, ventilation, and exposure. Where you are in that lifecycle should drive how often you inspect.

New roof (1-5 years)

A roof that was installed competently shouldn't have meaningful issues for the first five years. Inspect once at year three to baseline the condition (useful documentation if a manufacturer warranty issue ever arises), and then again after any major storm. If your roof is brand new and you're worried, a single early baseline inspection is worth it - sometimes installation defects only become visible after the first winter.

Middle-aged roof (6-15 years)

This is the maintenance window. Inspect every 2 to 3 years under normal conditions. Issues that surface during this period - small flashing failures, isolated shingle damage, sealant aging - are usually inexpensive to repair and dramatically extend the roof's usable life. Skipping inspections here is the most common reason roofs that could have lasted 25 years end up replaced at 18.

Aging roof (15+ years)

Annual inspection, especially in the fall before winter sets in. Once a roof is 15 years old, the rate of deterioration accelerates: granule loss, brittleness, sealant failure, and small leaks compound. Annual documentation also matters more for insurance - carriers increasingly want to see active maintenance records on older roofs.

End-of-life (20+ years)

If you're past 20 years on asphalt, the inspection's job changes. It's no longer about catching small issues to extend the roof's life; it's about deciding when to replace and budgeting for it. An annual inspection at this stage gives you 12 months of advance notice on a $15,000-$30,000 capital expense, which beats finding out during a December rainstorm.

Triggering events that warrant inspection

Outside of routine intervals, certain events should trigger an inspection regardless of where you are in the lifecycle:

  • Major hail or wind event - within 1-2 weeks. Hail bruising can be invisible from the ground but compromises the shingle's water resistance. Wind damage often lifts shingles slightly without removing them, leaving the underlayment exposed. Both produce leaks 6-18 months later. Insurance carriers also have time limits on storm-related claims; documenting damage promptly matters.
  • Before listing a home for sale. A pre-listing report is one of the highest-leverage documents a seller can produce. Buyers pay attention to the roof. Having a recent professional inspection on hand removes a major objection and often improves offers.
  • After buying a home - within the first month. The home inspection report your real-estate agent provided was probably done from the ground or with a quick ladder peek. A drone inspection gives you a real baseline of the roof you just bought, before you pay for any future damage that may have been pre-existing.
  • Before major exterior renovations. If you're about to install solar panels, replace eavestroughs, add a chimney liner, or do any work that involves people walking on the roof, inspect first. Pre-existing damage will get blamed on whoever was up there last otherwise.
  • After interior water damage. If you've found water staining on a ceiling, inspect the roof immediately. The water travelled some distance from where it entered - the visible interior damage is rarely directly under the source.
  • After tree damage or large debris on the roof. Even if a fallen branch didn't visibly puncture the surface, the impact can crack shingles, damage flashing, or compromise sealants. A drone inspection covers it without anyone climbing up.
  • Before insurance renewal. Some Ontario carriers now require recent inspection documentation on older roofs as a condition of continued coverage. Property managers and high-risk policies see this most. Getting ahead of it avoids a renewal scramble.

Seasonal timing in the GTA

Drone roof inspections can be done in any season except heavy precipitation, but some windows produce dramatically better results than others.

Late spring (best window)

After the snow has melted and before the major summer storms. April through early June is the best inspection window in the GTA for most properties. Winter ice damming, freeze-thaw cycles, and accumulated snow load all leave evidence that's easy to read in the spring. There's also enough time to schedule any needed repairs before summer thunderstorm season.

Early fall (next-best window)

September into mid-October. Catches summer storm damage and gives a final pre-winter check on flashings, sealants, and any issues that need attention before snow load and freeze-thaw begin. If you can only do one inspection a year on an aging roof, this is the one.

Summer

Workable, but heat hazes can affect imagery and roof surfaces are hot enough that any small softening or sealant issue is harder to see. Fine for a documentation flight; not the optimal moment for an issue-finding inspection.

Winter

Possible but not ideal. Snow obscures the surface; cold temperatures shorten drone battery life and affect pilot endurance. For emergencies (post-storm documentation, leak investigation), winter inspections are absolutely worth doing - just understand the limitation that what's under the snow can't be assessed until the snow's gone.

Specific situations - B2B focus

Different property types and roles have different inspection cadences that don't always match the homeowner pattern:

  • Roofing contractors: Pre-quote inspections on every meaningful job. Spending 20 minutes flying a drone before quoting eliminates the "we didn't see that from the ground" problem and produces tighter, more competitive bids. Some of our most regular clients are roofers using our inspections to scope their own work.
  • Property managers: Annual portfolio surveys, with the same flight plan flown in the same season every year. Year-over-year comparison is what makes a managed-property roof program valuable; you're catching deterioration trends, not single-frame issues.
  • Real-estate agents: Pre-listing flight on any property where the roof's age might be a concern. Our 48-hour turnaround - or 24-hour rush - fits inside typical purchase-and-sale timelines, which matters when a deal is contingent on the buyer's due diligence.
  • Insurance adjusters: Documentation flights for claim support. Drone imagery gives a chain of custody and high-resolution evidence that ground-level photos can't match.
  • Multi-unit residential and condo boards: Annual inspection is increasingly a baseline expectation. Reserve fund studies are easier to defend with imagery on hand.

How often is too often?

Past annual inspection, on a typical residential roof in good condition, you're past the point of useful return. There are two exceptions: portfolio properties where year-over-year tracking is the point, and specific properties under active monitoring (a known leak being repaired in stages, a recent storm whose damage you're tracking).

For everyone else, more frequent than annual is rarely worth it - but a triggering event resets the clock. If a major storm hits in July and your last inspection was in May, that's a separate inspection, not a duplicate.

DIY vs professional

A casual ground-level walk around the perimeter of your house every few months is a good habit. Look for:

  • Shingles in the yard or in the gutters that came from somewhere
  • Visible sagging in the roof line
  • Stains on soffits or fascias suggesting water has been escaping somewhere
  • Excess granule deposits at the bottom of downspouts (a sign of accelerated shingle wear)

That's the limit of what a homeowner can responsibly assess from the ground. Anything that requires actually looking at the roof - the slopes, the flashings, the valleys, the edges, the chimney detail - needs a drone or a ladder, both of which are best left to people doing it professionally and with insurance.

The single biggest thing we'd ask a homeowner not to do: don't get on your own roof with a phone camera. The fall risk is real, the documentation produced isn't useful enough to justify it, and you'll miss most of what an inspection is supposed to catch anyway.

Bottom line

If you take nothing else from this post, take this:

  • New roof - once at year 3, then after big storms.
  • 6 to 15 years old - every 2 to 3 years.
  • 15 to 20 years old - annually.
  • 20+ years old - annually, planning for replacement.
  • Plus: after every major storm, before sale, after purchase, before insurance renewal on older roofs.
  • Spring or early fall is the best window in the GTA.

If your roof is due for an inspection, we serve Toronto, Mississauga, Brampton, Markham, Vaughan, Richmond Hill, Oakville, and Burlington with 48-hour standard turnaround and 24-hour rush. Book a flight, or if you want to see exactly what you'll receive first, download our sample report (PDF).

Want to know exactly what's in a professional report? Read our guide to roof inspection reports. Curious why drones replaced ladders for most inspections? We wrote about that too.