We get asked this almost every week, and the honest answer is: it depends on what's up there, who put it on, and how the building has been treated since. Two houses on the same South Surrey street can have asphalt roofs the same age and one still has years left while the other is done. Climate alone isn't the deciding factor — exposure, ventilation, and how the original installer handled the details matter just as much.
The ranges below are what we actually see when we get up on roofs in Surrey, White Rock, Langley, and across the Lower Mainland. Treat them as a starting point, not a calendar.
Typical roof lifespan by material
Architectural asphalt shingles
Most architectural asphalt roofs we replace are between 20 and 30 years old. The ones that make it to 30 almost always have decent attic ventilation, gutters that were kept clear, and minimal tree cover. The ones tapping out at 18 are usually north-facing, shaded, or had a thin builder-grade shingle installed during the housing boom.
Metal roofing
A properly installed metal roof — exposed fastener or standing seam — will outlast the owner in most cases. We see 40 to 50 years regularly. What fails first isn't usually the panel itself, it's the fasteners, sealants at penetrations, or flashings at chimneys and skylights. Those details are what separate a metal roof that lasts and one that leaks at year 15.
Low-slope membranes
On the commercial and strata side, TPO and torch-on assemblies are usually planned around a 20 to 30 year window. Ponding water, rooftop foot traffic from HVAC techs, and seam quality drive most of the early failures we get called out for.
What our coastal climate actually does
The Lower Mainland doesn't get the freeze-thaw beating you'd see in the Interior, but we get something arguably worse for roofs: months of constant moisture. Shaded slopes never fully dry out. Moss takes hold. Water finds its way into every flashing detail that wasn't lapped correctly. Wind off the ocean lifts shingle edges that have lost their seal.
The roofs that age well here are the ones where the original crew respected drainage — step flashing tucked properly behind siding, kick-out flashings at wall terminations, ridge and intake venting that actually moves air. Skip those and the material warranty number on the box stops mattering.
What shortens a roof's life out here
- Blocked or undersized attic ventilation
- Gutters and downspouts that overflow every fall
- Flashings cut short or sealed with caulking instead of metal
- Heavy shade and moss that's been left to grow
- Trades walking on the roof for satellite, solar, or HVAC work
- Storm damage nobody got up to look at
- Layer-overs from a previous reroof hiding bad decking
Signs it's getting close
When we walk a roof to assess it, the things that move us toward recommending a roof replacement in Surrey are widespread granule loss in the gutters, shingles that curl or crack when you flex them, multiple leaks in different spots, flashings that have rusted through, or soft spots underfoot from rotted decking.
One blown-off shingle or a single flashing failure is usually a roof repair conversation, not a replacement one. We'll tell you straight which it is.
How to get more years out of what's up there
Keep gutters clear, deal with moss before it lifts shingle edges, and get eyes on the roof after a real windstorm. Our coastal roof maintenance guide walks through what to do each season.
When to call us
If you don't know how old your roof is, you're seeing wear from the ground, you're buying a house, or you've got a stain that wasn't there last year — book an assessment. We'll tell you whether you're looking at a small repair, a few more good years with maintenance, or a full replacement. No upsell.