Should I Repair or Replace My Roof? (Greater Victoria)

The repair-or-replace question in Greater Victoria is mostly asked about roofs installed between 1995 and 2008: the second or third roof on a Gordon Head split-level, the first roof on a Broadmead two-storey, the shingles that went on a Fernwood suite conversion. Those roofs are now 18 to 30 years old, which is exactly the range where a single leak can be either a $600 pipe-boot job or the first of many. The deciding factor is rarely the leak itself. It is how brittle the surrounding shingles are and how much moss has been sitting on the north slope.

Two local habits distort the decision. The first is repeated moss scraping, which can leave a 20-year-old roof looking clean while the granules are gone. The second is patching with sealant at chimneys and walls on the older James Bay and Fairfield homes, which buys a winter and then fails in the same spot. A roofer who quotes a repair on a roof of this age should be asked to say, in writing, how many years the rest of the roof appears to have left.

The tool starts with remaining life: the material's typical lifespan (20–30 years for laminate asphalt in our data, 40–60 for metal, 25–40 for cedar) minus the roof's age. It then shortens that figure for condition: widespread visible damage halves it, localized damage trims about 15%, several prior repairs cut 30%, one prior repair cuts 10%, and one or more leaks in the last two years cut 15% (three or more cut 40%). A 20-year-old asphalt roof with one earlier repair, one recent leak and localized damage comes out at roughly 0–7 years of remaining life.

It then counts signals. Age at or past the top of the lifespan range counts double; age inside the window counts once. A repair quote at or above 35% of the mid-point replacement cost counts once. Two or more leaks in two years, several prior repairs, and widespread damage each count once. Two signals or more and the verdict becomes 'a replacement evaluation may be economically reasonable'; fewer and it reads 'repair may still make sense'. Storm damage does not change the verdict but adds a note to document it for insurance before any work.

• Signal: roof age inside its lifespan window (+1) or past it (+2)
• Signal: repair estimate at or above 35% of replacement (+1)
• Signal: two or more leaks in the last two years (+1)
• Signal: several previous repairs (+1)
• Signal: damage across most of the roof, not one spot (+1)

A repair looks cheap over one year and often loses over ten. The tool prices a repair path as the repair now plus typical follow-up repairs each year ($0–$300 a year on a young roof, $200–$800 once the roof is inside its end-of-life window, $400–$1,200 when leaks are recurring) plus a full replacement if the remaining life runs out inside the horizon. For the 20-year-old example above, the repair path is $1,500–$14,100 over one year, $2,300–$17,300 over five, and $10,200–$21,300 over ten, against a replace-now path of $6,900–$13,100. Over ten years replacing wins; over one year repairing wins; over five they are similar.

That is why the honest answer depends on how long you plan to stay. Moving within two years usually favours a documented repair plus disclosure. Staying ten or more years usually means you will pay for the new roof anyway, so paying for repairs first only adds to the bill.

Most single-point leaks on a roof under about 15 years are repairs in Greater Victoria: a cracked pipe boot ($250–$600 in our repair menu), lifted step flashing at a wall or chimney ($400–$1,500), a few wind-lifted shingles on one slope ($350–$900), a skylight reseal ($300–$900). The shingles around the repair are still flexible, so the roofer can lift and reset them without breaking more.

Widespread curling, granule loss showing black patches on south and west slopes, moss that has lifted shingle edges across a whole north slope, a leak that has moved from one spot to two, and soft decking felt from the attic all appear consistent with system-level wear. These are not conditions a patch fixes for long, and a professional inspection is the right next step rather than another repair quote.

Ask the repair contractor for the age and condition of the rest of the roof in writing, whether the repair carries any workmanship warranty, and whether matching shingles are still available (discontinued profiles are a hidden reason repairs fail visually and physically). Ask the replacement contractor for the roof area in squares, the decking allowance, and whether the flashing at chimneys and walls is new metal. With both quotes in hand, run the numbers through the tool rather than choosing on gut feel.