Dumpster Guide for ADU and Backyard Cottage Construction in Portland

Why ADUs are suddenly everywhere in Portland

Drive through Kenton, Overlook, Woodlawn, or any of the established bungalow neighborhoods on Portland's east side and you'll see it: a detached garage torn down and replaced with a two-story backyard cottage, a narrow side yard turned into a driveway for a new accessory unit, a single-family lot with a "for sale" sign advertising it as a future lot split. This isn't a scattered trend. Oregon's 2019 middle-housing law (HB 2001) forced cities over 25,000 people to allow duplexes, triplexes, fourplexes and accessory dwelling units on lots that used to be zoned strictly single-family, and Portland layered its own Residential Infill Project on top of that, opening most inner-neighborhood lots to two to four units — sometimes six with an affordability commitment. Add in the city's long-standing ADU permit-fee waiver program and Middle Housing Land Divisions that let an owner legally split one lot into two, and you get exactly what we're hauling debris out of every week: backyard cottages, garage-to-ADU conversions, internal basement conversions, and duplex splits on lots that were platted for a single 1920s bungalow.

We've hauled off framing scrap in North Portland alleys a block from our own yard on N Albina, delivered 15-yarders to tight lots in Woodstock and Montavilla, and dropped construction dumpsters for lot-split duplex builds as far out as Gresham and Milwaukie. The common thread on almost every one of these jobs is the same: it's a full construction project, but it's happening on a footprint that was never designed for a construction dumpster, a lumber delivery, and a crew of six all at once.

Sizing an ADU dumpster by phase, not by "the project"

The biggest mistake we see on ADU jobs is ordering one dumpster size for the whole build the way you might on a simple remodel. An ADU build runs through genuinely different debris phases, and each one has a different volume and weight profile.

Site prep and demo. If the ADU is replacing an existing detached garage, shed, or a partial teardown of an old outbuilding, this phase generates heavy, dense debris fast — old dimensional lumber, cracked concrete slab or footing, sometimes old asphalt shingle roofing off a garage roof. A 20-yard is the workhorse here for a garage-footprint demo; if there's a concrete slab or old foundation coming out, that debris is heavy enough that we'll often talk builders into a 15-yard loaded to its weight limit rather than a 20-yard that looks half-empty but is already over its ton allowance. New-build ADUs going up on a bare side yard or backyard corner (no demo) can usually skip this phase's dumpster entirely and start with framing.

Framing and rough-in offcuts. This is lighter, bulkier waste — stud offcuts, sheathing scrap, packaging from windows and doors, cut-offs from siding and roofing underlayment. Volume is high but weight is moderate, which is the classic profile for a 20-yard. Because most ADU lots don't have room to stage a second dumpster next to the first, this is usually the container that sits on site longest, through framing, roofing, and rough electrical/plumbing/HVAC.

Finish work. Drywall scrap, flooring offcuts, trim, cabinet and fixture packaging, paint cans (empty and dried only), and general job-site cleanup. Volume drops but drywall in particular is deceptively heavy — a 10 or 15-yard is usually right for this stretch, and it's often the container that also catches the final broom-clean debris before occupancy.

Most ADU builds we serve end up using two dumpster swaps rather than three — a 20-yard through demo and framing, then a 10 or 15-yard for finish debris — but every lot is different, and the honest answer is to call and describe the phase you're in. Pricing on any of these runs in the same general $350–$750 range as our other roll-off work, and flat-rate quotes include delivery, pickup and disposal, but the only way to get a real number for your specific lot and debris type is to call us at (971) 754-2757.

Tight-access reality on established residential lots

This is the part that actually separates an ADU project from ordinary dumpster logistics. New-construction subdivisions in places like Happy Valley have wide streets, no mature trees, and lots built with a driveway apron sized for delivery trucks. A backyard cottage project in a 1910s-1940s Portland neighborhood is the opposite. We're routinely working around:

• Narrow driveways and shared-access strips. A lot of Portland's older east-side blocks were platted with single-car driveways or shared gravel access strips between houses — barely wide enough for our roll-off truck, let alone with a dumpster parked on top of it.
• Mature street trees and overhead lines. Portland's older neighborhoods have real tree canopy — a driveway that looks open on a satellite map can have a Douglas fir or big-leaf maple canopy low enough to block a roll-off truck's boom.
• No side-yard room at all. When the ADU is going in the backyard, the dumpster often has to sit in the front, which means longer material-carry distances for the crew and, on a genuinely tight lot, may mean the container needs to sit at the curb or partly on the street apron rather than fully on private property.
• Alley access. Some of the older North and Northeast Portland blocks — including areas near our own yard by Kenton and Swan Island — still have functioning alleys behind the houses. When an alley is usable, it's often the best placement option for an ADU dumpster because it keeps the front yard and driveway completely clear for the rest of the build; when it isn't (blocked, too narrow, or the neighbor's fence encroaches), we plan the drop around the street instead.
• Lot-split duplex sites. When a single lot has been legally split into two, we're often coordinating dumpster placement for two structures going up close together with almost no buffer, which usually means a single, centrally-placed container serving both crews rather than one per address.

None of this is a reason to skip the dumpster and just haul debris in a pickup — it's a reason to have the placement conversation with us before delivery day, not after the truck is already stuck at the curb. We ask about driveway width, overhead clearance, and whether the container needs to sit in the right-of-way before we schedule the drop, precisely because ADU lots are where that question actually matters.

How an ADU build differs from a full new-construction site

A ground-up new house on a cleared lot is, logistically, one of the easier jobs we do: open access, no existing structure to work around, and usually enough room for a 30 or 40-yard to sit for the entire framing phase. An ADU or backyard cottage build is almost the opposite. The footprint is smaller — most backyard cottages run well under 1,000 square feet — so total debris volume across the whole project is often less than a single-family new build. But the site itself is more constrained at every step, which means we're sizing for a tighter placement window and a shorter total time-on-site per swap, with more swaps rather than one big container sitting for months.

Existing utilities are also part of the picture in a way they aren't on a bare lot. Sewer lateral tie-ins, an existing water line to the main house, or a shared electrical panel upgrade all mean occasional utility-locate work happening on the same tight lot as the dumpster — another reason placement gets planned in advance rather than improvised. And because the main house is still occupied through most ADU builds (the homeowner is usually living in the front house while the cottage goes up in back), noise, driveway access for the household, and keeping a walkway clear all matter in a way they simply don't on an empty lot.

Permits for the dumpster itself, not the ADU

Separate from any building permit for the ADU structure, there's a simple rule for the dumpster: within the City of Portland, a container placed entirely on private property — your driveway, side yard, or the job site itself — does not need a permit. If the lot is tight enough that the container has to sit partly or fully in the public right-of-way (the street or sidewalk), you may need a temporary street-use permit from the City of Portland, and our team can help walk you through that process since it comes up often on tight ADU lots. For every other city in our service area — Beaverton, Hillsboro, Tigard, Lake Oswego, Milwaukie, Gresham, Oregon City and Happy Valley — we have not verified a specific municipal rule for dumpster placement, and we're not going to guess at one. If your ADU is going up in one of those cities and the container might need to sit at the curb, call your city or county office directly to confirm before ordering.