In a climate that rains from October to June, siding isn't decoration — it's the part of the house keeping water out of the framing. If you're seeing soft trim, peeling paint that keeps coming back, or hardboard swelling at the bottom course, describe the walls and we'll match you with a siding contractor in Portland who works this housing stock.
Repaint if the boards are sound and paint is simply weathered evenly. Replace if you find soft spots you can push a screwdriver into, swelling at the bottom course, or paint that fails in the same places within two years of a repaint. Repeat failure means water is getting behind the siding, and coating over it changes nothing.
Fiber cement dominates replacement work here because it handles moisture and holds paint through our wet season. Cedar shingle and bevel siding still suits older homes and neighbourhoods where the look matters, at the cost of a maintenance schedule you have to actually keep. Vinyl is the budget option and performs fine when installed properly, though it fits some architectural styles better than others. Engineered wood sits in between.
Behind the siding sits weather-resistive barrier, flashing at every window head and horizontal joint, and — on a well-built wall — a rainscreen gap that lets water drain and the assembly dry. Portland's climate punishes walls without that gap. When you compare bids, compare what's happening behind the boards, because that's where the difference in price and lifespan actually lives.
Pull siding off a house that's been through thirty wet winters and you'll usually find something: soft sheathing under a window, a mud-sill that wicked, or a deck ledger flashed with hope. Rot repair should be quoted as a unit rate in the contract, not improvised mid-job. A crew that has done this in this city will tell you where they expect to find it before they open anything.
Portland gives siding crews a reliable dry window from roughly July to early October, and that window is booked well in advance. Work does happen outside it, sequenced one elevation at a time under tarps, but progress slows and paint schedules get complicated because most exterior coatings want surface temperatures above about ten degrees and a dry substrate. If you are planning a full replacement, ringing round in February for a summer slot gets you better crews and better pricing than ringing round in August with water already coming in. The exception is active rot, which does not wait for a convenient season and should be opened up as soon as it is found.
Siding quotes diverge more than almost any other trade, and the gap is nearly always in what is not written down. Ask each contractor four things in writing: whether the price includes full tear-off or is a cover-over, whether new weather-resistive barrier and new flashing go on or the existing ones are reused, what the per-sheet or hourly rate is for rot repair found after opening the wall, and whether painting is included or a separate trade. A bid that answers all four and costs more is usually the cheaper wall over twenty years. A bid that answers none of them is not a price, it is an opening position.
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Under mature firs and maples, the north and east elevations stay shaded and damp most of the year. That's where moss and algae colonise, where paint fails first, and where cedar goes grey and then soft. Trimming branches back to let air move across those walls does more for siding life than any product choice.
Full siding replacement is generally permitted work through Portland Permitting & Development. In designated historic districts and conservation areas, exterior material and appearance changes can face additional review, so check before ordering material. Houses built before 1978 also fall under federal lead-safe rules, and your contractor should be certified for that work — ask to see it.
Anyone doing siding work for compensation in Oregon must be licensed with the Construction Contractors Board, and there is no handyman exemption for small jobs. The licence number should appear on the bid and on the contract, and the CCB registry is free to search: it shows whether the bond and liability insurance are current and whether there are complaints on file. An unlicensed crew means no bond, no insurance behind a mistake that soaks your framing, and no route through the CCB's dispute process.
| Material | Typical service life here | What it asks of you |
|---|---|---|
| Fiber cement | 40 to 50 years | Repaint roughly every 12 to 15 years |
| Cedar bevel or shingle | 30 to 40 years if maintained | Stain or paint every 5 to 8 years, no exceptions |
| Engineered wood | 25 to 35 years | Keep cut ends sealed and ground clearance honest |
| Vinyl | 25 to 40 years | Almost nothing, but damage means replacing courses |
| Hardboard (existing) | Usually past it | Swells at the bottom course, no longer sold here |
Fiber cement replacement on a typical Portland house commonly runs $16,000–$40,000 depending on square footage, trim complexity, and whether a rainscreen and new house wrap are included. Vinyl usually comes in lower, cedar noticeably higher, especially if it's being finished on site. Rot repair is normally billed on top at a per-sheet or per-hour rate. Two-storey work, steep grades, and difficult access all add labour. A bid meaningfully below the others is usually skipping the drainage layer or reusing existing flashing — ask specifically about both.
They found rot under two windows the moment the old siding came off, showed me the framing, and the repair was already priced in the contract. No drama.
Our north wall was green with moss every winter. New siding with a drainage gap and three years later it still looks like the day they finished.
His was the only bid that described the weather barrier and the flashing tape rather than just the boards. Watching that layer go on made the price difference make sense.
Sometimes physically possible, rarely wise in this climate. Covering old siding hides whatever moisture damage exists and complicates flashing at windows and doors. Most reputable Portland crews will insist on a tear-off so they can see and correct the wall underneath.
A typical single-family house is usually one to three weeks of active work, weather permitting, plus lead time for material. Crews tarp and sequence elevations so the house isn't left open, but a wet stretch will stretch the schedule.
If paint fails repeatedly in the same spots — under windows, at the bottom course, on one shaded elevation — the cause is usually moisture getting behind the siding, not the coating. Repainting over that treats the symptom and buys you two years.
It's the cheapest moment you'll ever get. Many older Portland walls have little or no insulation, and exterior rigid insulation or dense-pack while the siding is off is far less disruptive than doing it later from inside. Get it priced as an option in the bid.
Yes, and on a house where only the south or west wall has taken the weather it is often the sensible spend. Two things to settle first: whether the new material can be matched or blended acceptably with what stays, and whether the flashing where old meets new is being detailed properly rather than caulked. Partial work costs more per square foot than doing the whole house, because the setup, scaffold and mobilisation are much the same either way.
It is a deliberate gap, usually made with vertical furring strips, between the weather-resistive barrier and the back of the siding. Water that gets past the boards drains down that gap and out at the bottom, and air moving through it dries the wall. In a climate with eight months of rain it is the single detail that most affects how long the wall lasts. Some manufacturers now require it to keep the warranty valid on certain cladding, so ask what your material specifies.
Nothing. Describing the project and receiving quotes is free, and there is no fee if you hire someone. You pay your contractor for the work, and that is the entire arrangement.
Usually two to four, matched on trade, project size and whether they genuinely work your area. Only those matched to your job see your details — we do not resell requests.
Send photos of the trouble spots and a rough idea of the house size. Portland siding contractors will come back with free, itemized bids.
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