A roof is the most expensive single component on a typical home and the one most affected by weather. Replacement costs range from $8,000 to $25,000 for asphalt shingle roofs and $30,000+ for metal or tile. Repairs caught early run $300 to $1,500. Repairs deferred until water gets into the decking and framing run $5,000 to $20,000. The economics strongly favor regular inspection. The question is what you can do yourself, what needs a pro, and how to know the difference.
Why roof inspections matter
Roofs fail in two ways: catastrophic damage (storm damage, fallen tree limb, ice dam failure) and gradual deterioration (aging shingles, failing flashing, accumulated wear). Catastrophic damage is usually obvious. Gradual deterioration is the more expensive failure because it goes undetected for months or years while water slowly damages the decking, framing, and interior finishes below.
Most asphalt shingle roofs last 18 to 25 years. The last 5 years of that lifespan are where annual inspection becomes critical. Small leaks in year 18 can cost $200 to fix. The same leak ignored until year 20 can cost $8,000 in decking replacement plus interior repairs.
The ground inspection (any homeowner can do this)
Walk the entire perimeter of the house with binoculars on a clear morning. Look at the roof from at least three angles for each face. Note anything that catches your eye and photograph if possible for comparison next inspection.
What to look for:
- Missing shingles. Dark patches where shingles are gone or curled significantly.
- Lifted shingle corners. Visible upturned edges, especially after wind events.
- Granule loss patches. Smooth or shiny areas where granules have worn off. Granule loss accelerates UV damage to the underlying asphalt.
- Damaged or rust-stained flashing. Around chimneys, plumbing vents, skylights, and roof-to-wall transitions.
- Sagging ridges or planes. A roof should be straight along ridges and reasonably flat across each plane. Visible sag indicates structural issues underneath.
- Moss and algae. Dark streaking is mostly cosmetic algae. Green moss growth is more serious because moss holds moisture against shingles and accelerates deterioration.
- Gutter granule accumulation. Look at the gutters or downspout discharge for piles of granules washed off shingles. Heavy granule loss in gutters means shingles are aging fast.
- Sagging gutters or detached gutters. Pulling away from the fascia indicates either gutter overflow from clogs or rotting fascia underneath.
- Damaged or missing soffit panels. Visible from the ground, indicates moisture damage or animal entry.
Photograph anything notable. Compare against last inspection. Changes are more informative than single snapshots.
When to climb (if at all)
Climbing makes sense for single-story, low-slope (under 4/12) roofs with safe ladder access, for homeowners comfortable with extension ladders, and for inspection only (not actual repair).
What to wear:
- Soft-soled rubber shoes (not work boots, not running shoes)
- Long pants (protects from shingle abrasion)
- Work gloves
- Optional but recommended: roofing harness anchored to a stable point
What to check from the roof:
Walk carefully along the roof valleys and ridges where the slope is least steep. Inspect:
- Shingle condition up close. Lift the corners of suspect shingles to check whether they snap back or remain bent. Bent corners are dry, brittle, and near end of life.
- Flashing details. Step flashing along walls, counter flashing along chimneys, pipe boots around vents. Cracks in boot rubber and gaps in step flashing are common.
- Soft spots in decking. Walk slowly across the roof and note any softness underfoot. Soft decking means water has penetrated and the wood is rotting.
- Ridge cap condition. Ridge shingles often deteriorate faster than field shingles due to wind exposure.
- Penetration seals. Caulk and seals around vents, skylights, antennas, and solar panel mounts.
What NOT to do during DIY:
- Walk wet, frozen, or moss-covered roofs (slip and fall risk)
- Walk steep roofs without proper fall protection
- Step on damaged or suspect areas (you can fall through)
- Step in valleys with debris accumulation (slippery and may hide rot)
- Climb during heat over 90°F (shingles soften and damage easily under foot pressure)
When to call a pro
Schedule a professional inspection for any of these situations:
- Roof age over 15 years (regardless of visible condition)
- After any storm with hail or wind over 50 mph
- After any visible interior water leak
- Before buying a home
- During real estate sale prep
- Insurance claim documentation
- Steep roof (over 6/12 pitch) or two-story homes
- Visible structural concerns (sagging ridges, soft spots from the attic)
- Specialty roofs (slate, tile, metal, EPDM)
A professional inspection should include:
- Full walking inspection of all accessible areas
- Close-up examination of all flashing
- Soft spot probing with proper tools
- Attic-side inspection from inside (looking at the underside of decking for water staining, rust on nails, and daylight)
- Written report with photos
- Specific repair recommendations with cost estimates
- Estimate of remaining roof life
Reject “inspections” that consist only of a 15-minute walkaround. A thorough inspection takes 45 to 90 minutes for a typical single-family home.
Drone inspections
Drone-based roof inspections are increasingly common and offer specific advantages: complete photographic documentation, ability to inspect very steep roofs safely, and ability to inspect roofs without the disruption of walking on the surface. Cost is $150 to $300 with a full photo report.
Limitations: drones cannot probe soft spots, lift shingles to check seals, or inspect the attic side. They are best used as documentation tools and for steep or otherwise inaccessible roofs. For complete inspection, combine drone documentation with attic-side inspection and selective close-up climbing where needed.
The attic-side inspection
A surprisingly informative inspection happens from inside the attic on a sunny day. Look for:
- Daylight through the roof deck. Any visible daylight from inside the attic means a hole exists in the roof.
- Water staining on rafters or decking. Dark patches, especially around vents, chimney chases, and along valleys.
- Rusted or corroded roofing nails poking through the decking. Indicates moisture from condensation or leaks.
- Insulation displaced. Indicates animal activity or moisture.
- Mold or mildew odor. Indicates active moisture problem.
Attic-side inspection takes 10 minutes and reveals problems invisible from the roof surface or from the ground.
Final notes
Most homeowners can handle ground-level inspection twice a year and attic-side inspection annually. Climbing is reasonable for confident homeowners on accessible single-story roofs. Professional inspection every 2 to 5 years (more often as the roof ages) catches the gradual deterioration problems before they become structural repairs.
See the gutter cleaning article and fall winterization checklist for related tasks. The methodology page covers our approach to home maintenance product testing.
Frequently asked questions
How often should a roof be inspected?+
Twice a year for a thorough visual inspection from the ground (spring and fall), plus after any major storm with wind over 50 mph, hail, or heavy snow loads. Professional inspection every 2 to 5 years depending on roof age: every 5 years for roofs under 10 years old, every 2 to 3 years for roofs 10 to 20 years old, and annually for roofs over 20 years old. Storm damage inspections by a contractor should happen after any significant event because hail damage in particular is not visible from the ground.
What can I check from the ground without climbing?+
Approximately 30 to 40% of common roof issues. With binoculars from multiple angles, you can see: missing or lifted shingles, exposed nail heads, sagging gutters, damaged flashing around vents and chimneys, debris accumulation, moss and algae growth, and visibly damaged shingles. You cannot see: granule loss progression, soft spots in the decking, lifted shingles that have fallen back into place, hairline cracks in flashing, and condition of underlayment. Ground inspection is valuable for monitoring obvious changes but not sufficient as a standalone evaluation for older roofs.
How much does a professional roof inspection cost?+
Standalone inspection: $200 to $500 depending on roof complexity, height, and region. Some roofers offer free inspections in exchange for the right to bid on any repairs found. Free inspections can be valid but biased toward finding work. Independent inspectors (not affiliated with a roofing contractor) charge more but provide unbiased assessments. Worth the extra cost when buying a home or filing an insurance claim. Drone-based inspections are increasingly common and run $150 to $300 with a full photo report. Drone inspections are excellent for documentation but limited on detailed flashing assessment.
When should I climb on my own roof?+
Single-story homes with low slope (under 4/12 pitch) and good ladder access are reasonable DIY for confident, fit homeowners. Steeper pitches (5/12 to 8/12) require fall protection, proper roofing shoes, and experience. Anything 9/12 or steeper or any height above one story should not be DIY without proper safety equipment and training. Wet roofs, frozen roofs, and roofs with heavy moss growth are extremely slippery and should never be walked. Falls from roofs account for thousands of serious injuries each year, with averaged falls from one story sometimes causing fatal head injuries.
What are the warning signs that need immediate attention?+
Active water leak through the ceiling (call same day, tarp temporarily), missing shingles after a storm (call within a week), exposed underlayment, sagging roof line visible from the ground, large areas of granule loss in gutters or downspouts, daylight visible through the attic from inside, severe moss buildup that retains moisture against shingles, and any damaged flashing around chimneys or vents. Less urgent but worth addressing soon: aging shingles approaching end of life, occasional lifted edges, and minor granule accumulation in gutters.
