The Lettered Streets neighborhood sits close enough to Bellingham Bay that wind-driven rain, moss, and years of moisture cycling take a real toll on exterior walls, and the housing stock here skews old — a lot of these homes were built in the early 1900s through the 1940s, long before modern water-resistive barriers and rainscreen gaps were standard practice. That combination means a siding replacement in this neighborhood is rarely just a cosmetic swap. It usually turns into a chance to find and fix what has been happening behind the old siding for decades: soft sheathing, damaged framing at window sills, and insulation that never met current expectations.
For a typical single-family home in the Lettered Streets, plan on somewhere between two and four weeks from the day crews arrive to the final walkthrough, assuming no major rot is found and weather cooperates. Homes with extensive sheathing repair, multiple stories, or intricate trim detail common to the neighborhood's older Craftsman and vernacular houses can run longer. Add another one to three months on the front end for permitting, material ordering, and scheduling — longer if you're ordering fiber cement or specialty trim profiles during a busy season. Alpine Exteriors builds weather slack into every schedule here, because a dry stretch in Whatcom County is never guaranteed, even in July.
Because the Lettered Streets neighborhood is inside Bellingham city limits, a residential siding replacement typically requires a permit through the City of Bellingham Permit Center, particularly when work involves removing siding down to the sheathing, replacing damaged framing, or altering trim and window flashing. If your home has any historic designation or sits in an area with additional design review, factor in extra lead time for that review before a permit is issued — your contractor should confirm this with the city before ordering material, not after.
Most of these older lots don't have a homeowners' association, but if yours does, check any covenants on siding material, color, or profile before you sign a contract. It's a five-minute phone call that saves a re-order later.
Material lead times are the part homeowners underestimate most. Fiber cement lap siding and specialty trim can take several weeks to arrive depending on the manufacturer's production schedule, and custom colors or wider board profiles add time. Material typically gets ordered as soon as the contract and color selections are final, but a homeowner who wants to swap colors mid-project should expect that decision to push the whole schedule back.
Every home is a little different, but a siding replacement in this part of Whatcom County generally follows the same sequence:
A few weeks before crews arrive, walk the perimeter of the house and note anything you want moved or protected — hanging planters, yard art, irrigation lines close to the foundation. Trim back shrubs and vines that touch the siding; on a lot of Lettered Streets properties, decades-old plantings have grown right up against the walls and will need to be pulled back a few feet for crews to work safely.
Expect noise, dust, and a work crew on site most weekdays for the duration of the project. Parking is worth thinking through ahead of time given how tight street parking can get on some of these blocks — ask your contractor where their crew and material delivery vehicles plan to park. If you have pets, plan on keeping them indoors or off-property during active work hours, since gates and yard access will be in and out of use.
Inside the house, it's worth checking that anything hung on exterior walls — mirrors, shelves, picture frames — is secure, since nailing and impact on the outside can carry a faint vibration through older wall assemblies. This is a minor thing but one people forget until a picture frame shifts.
If your project required a permit, a city inspector will need to sign off at the appropriate stage — typically after the water-resistive barrier and flashing are installed but before siding covers it, and again at final completion. Your contractor should schedule these inspections as part of the project timeline rather than leaving it to you to track down.
Daily cleanup should be part of the routine, not just a final step — old siding debris, cut-offs, and nails should be cleared from the yard each day, particularly if kids or pets use the yard. At the end of the project, expect a full walkthrough where you and the crew lead go around the house together, checking caulk lines, paint touch-ups, trim gaps, and anything that needs a final adjustment before the job is called complete. This is the time to point out anything that doesn't look right — not three weeks later.
New siding in this climate still needs some homeowner attention. Moss and algae growth on north-facing walls and anywhere shaded by trees is close to inevitable given how much rain Whatcom County gets, and periodic gentle washing — not high-pressure blasting, which can force water behind panels and damage caulk lines — keeps it looking good and helps siding last. Check caulking at trim and window returns every year or two, since UV and moisture cycling will eventually break down sealant even on a well-installed job.
Alpine Exteriors carries Washington state contractor license ALPINI751OW and stands behind its installation work with a workmanship warranty, separate from whatever product warranty comes from the siding manufacturer. Ask specifically what's covered by each — manufacturer warranties on the siding material itself typically outlast installation warranties, and knowing which is which matters if something needs attention five or ten years down the road.
In most cases, yes. Because these homes are inside Bellingham city limits and siding work often involves opening the wall to the sheathing, a permit through the City of Bellingham Permit Center is typically required. Your contractor should pull this permit and coordinate any required inspections as part of the project.
Given the age of housing stock in this neighborhood and decades of exposure to Pacific Northwest rain, finding some degree of rot at window sills, corners, or lower wall sections isn't unusual. When it's found, the affected sheathing or framing gets cut out and replaced before new siding goes on. This can add time and cost to a project, which is why a thorough inspection during the estimate phase matters — it reduces surprises, though it can't eliminate them entirely since some rot is only visible once the old siding is off.
Work can proceed through most of the year, but persistent rain and shorter daylight in the fall and winter months slow progress and require more careful sequencing so walls aren't left exposed overnight. Spring and summer generally offer more predictable working conditions, though summer is also the busiest season for scheduling and material lead times.
It can, especially if the wall assembly is opened during the project. When that happens, the affected walls may need to meet current Washington State Energy Code requirements, which can mean adding continuous insulation or upgrading cavity insulation. This is worth discussing with your contractor at the estimate stage since it affects both the budget and the finished wall thickness at trim and window returns.
If you're weighing a siding replacement for a home in the Lettered Streets or anywhere else in Whatcom County — Bellingham, Ferndale, Lynden, Blaine, Birch Bay, Sudden Valley, or the islands — Alpine Exteriors can walk your property, look at what's actually happening behind the existing siding, and lay out a realistic timeline and scope before any contract is signed. Reach out to schedule an on-site assessment.