HD Landscape and Maintenance provides specialty landscape services in Lake Oswego, OR — irrigation installation, low-voltage landscape lighting, and tree and shrub care. We’re licensed through the Oregon Landscape Contractors Board (LCB #9977) and work throughout Clackamas County and the Portland metro area.
By Donavan Hesedahl, Owner/Operator · Last updated July 2026
Specialty landscape services are the technical systems inside a landscape — irrigation, low-voltage lighting, drainage, and mature tree and shrub care. They’re separate from routine mowing and cleanup because each one involves permits, code compliance, or plant-health decisions that a general maintenance crew isn’t licensed or trained to make.
In Lake Oswego specifically, that distinction has teeth. Three of the four categories above run straight into city code:
That’s the practical answer to why “specialty” is a real category here and not marketing language.
Every irrigation install in Lake Oswego starts at the point of connection, not the sprinkler heads. Under the city’s cross connection code, an irrigation service of any size requires an approved and tested backflow prevention device — Lake Oswego’s utility code prohibits any interconnection between the city water supply and another water source without an approved and tested backflow prevention device, and specifically names irrigation service of any size as triggering the requirement (LOC Article 38.12).
Two things follow from that, and they’re the two things homeowners are most often surprised by:
The July 15 deadline is real. Lake Oswego requires annual testing of backflow prevention assemblies, and those tests must be performed no later than July 15 each year, with the report submitted to Public Works. We schedule new installs so the assembly is in and documented well ahead of that window rather than in the June scramble. The city’s backflow and cross connection control program page has the current tester list and submission details.
Device type matters on retrofits. Lake Oswego’s program specifies that if an irrigation system using atmospheric vacuum breakers or a pressure vacuum breaker needs more than normal repairs, those devices must be replaced with approved double-check backflow devices — and the city requires test cock plugs on any device installed below grade. On older Lake Grove and Waluga systems we open up, that’s frequently the deciding factor between a repair and a proper replacement.
Beyond the point of connection, the local variables we design around are soil and water pressure. Lake Oswego sits in USDA hardiness Zone 8b, on heavy clay through most of the Palisades and Westlake areas, which means low-precipitation-rate rotors and longer cycle-and-soak schedules rather than short high-volume runs that just sheet off. And because Lake Oswego’s drinking water originates in the Clackamas River watershed, drawn from an intake in Gladstone and treated at the city’s plant in West Linn, static pressure varies noticeably by elevation — Mountain Park and Forest Highlands zones get designed differently than the flatter Old Town and First Addition lots.
We quote after a site visit, because the honest cost drivers are all property-specific: total square footage and zone count, whether a new backflow assembly and permit are required or an existing one can be reused, trenching distance and what’s in the way (mature roots, hardscape, existing utilities), and controller type. Smart controllers cost more up front and typically pay back through the city’s watering season.
We’d rather give you a real number after seeing the property than a range that turns into a change order.
One rebate worth knowing about before you budget. The City of Lake Oswego Water Conservation Program offers up to $200 in utility bill credit toward the cost of a professional water use assessment — an evaluation of your existing irrigation system and landscaping against water-saving practices. It’s offered first-come, first-served to Lake Oswego water customers during irrigation season, and the window closes each year once the allocation is used. Check current status on the City’s rebate programs page or call Water Conservation at 503-675-3747.
Note that Lake Oswego runs its program independently: the Clackamas River Water Providers conservation program explicitly does not cover Lake Oswego or Tigard customers, so rebate information you find for neighbouring Clackamas County cities won’t apply to your address.
In Oregon, yes — more than in most states. Portland-area sunsets fall before 4:30 p.m. in December, so an unlit landscape is effectively invisible for the majority of the hours you’re home between November and February. Landscape lighting in the Portland metro is less about ambience than about actually being able to use and see your property for half the year.
The practical case in Lake Oswego breaks down into three things:
There’s a licensing wrinkle worth knowing about, because it separates contractors who do this legitimately from ones who don’t. Oregon allows a licensed landscape contracting business to perform low-voltage irrigation control wiring and outdoor landscape lighting without a separate electrical contractor’s license — but the business must issue an identification card to its landscape irrigation control wiring or outdoor landscape lighting installer, on a form provided by the State Landscape Contractors Board, showing the installer’s name and the business’s LCB identification number, and that card must be carried by the installer at the job site while performing the allowed electrical installations (ORS 479.940). Ask any lighting contractor to show you that card. Ours carry them.
Anything at line voltage — a 120V outlet, a permanent transformer circuit, a lit structure — is outside that exemption and goes to a licensed electrician. We say so up front rather than discovering it mid-job.
Tree and shrub care on the Westside is mostly a Douglas fir, western red cedar, big-leaf maple, rhododendron, and laurel conversation. What changes in Lake Oswego is not the biology — it’s the permitting.
Lake Oswego’s Tree Code (LOC Chapter 55) regulates removal city-wide, and the thresholds are tighter than most people expect:
The reason this matters for specialty work and not just tree removal: the tree code also governs excavation near protected trees. Lake Oswego’s tree protection article limits excavation around protected trees, with a carve-out for excavation for irrigation that requires a plumbing permit under LOC Chapter 46. In plain terms — trenching an irrigation main across a lot with protected trees is a code question before it’s a shovel question. Getting that sequence backwards is how homeowners end up with a per-tree enforcement fee.
So on Lake Oswego properties we walk the tree situation before we plan the irrigation route, not after. Our practical approach is pruning and structural care first, removal only where the tree is genuinely hazardous or dead, and permit paperwork handled before mobilization.
One more overlay to check before any trenching. Lake Oswego maintains Sensitive Lands designations (LOC 50.05.010) covering stream corridors, wetlands, and tree groves, and properties near Tryon Creek and the city’s wooded draws are frequently affected. Where an overlay applies, permitted activity is constrained — which matters for irrigation mains, lighting wire runs, and drainage work just as much as for tree removal. We confirm overlay status at the site visit rather than discovering it once a trench is open. Design-stage detail on how these overlays shape a plan is on our landscape design page.
We work across Lake Oswego and the surrounding Clackamas County communities. In the city, that includes:
Lake Grove · Waluga · Westlake · Palisades · Mountain Park · Forest Highlands · First Addition · Old Town · Glenmorrie · Hallinan Heights · Oak Creek · Lakewood · McVey–South Shore · North Shore–Country Club · Uplands · Westridge · Evergreen · Rosewood · Birdshill
Outside city limits, we cover West Linn, Oregon City, Tualatin, Wilsonville, Clackamas, and Dunthorpe, plus our home base across the river in Washington County — Aloha, Beaverton, Tigard, Hillsboro, and Sherwood on Portland’s Westside. Because we run crews on both sides of the Willamette, tree and shrub care in Beaverton and Tigard runs on the same schedule as our Lake Oswego routes.
More Lake Oswego pages: Yard care services (recurring full-property maintenance) · Lawn care services · Landscape design · Sustainable landscaping · Seasonal landscape services.
HD Landscape and Maintenance is an Oregon LCB-licensed landscape contracting business (LCB #9977) and holds a rating with the Better Business Bureau. Request a free quote for your Lake Oswego property →
Most Lake Oswego properties need irrigation and drainage first, lighting second, and tree care on an ongoing cycle. If your lawn browns out by mid-July, irrigation is the gap. If water pools against the foundation in November, drainage is. If you have mature firs or a heritage-scale oak, tree care isn’t optional — it’s the highest-value asset on the property.
Oregon landscape lighting is typically priced per fixture installed, plus transformer and controller. The variables are fixture count, wire run distance, whether trenching crosses hardscape, and fixture material — brass and copper cost more up front and last far longer in the Willamette Valley’s wet winters than aluminum. Current Lake Oswego packages typically run.
Spring through early summer is ideal — March through June — so the system is commissioned and the backflow assembly tested before Lake Oswego’s July 15 testing deadline and before the dry stretch from July into September. Fall installs work fine too; we simply blow the system out and winterize it immediately. The window to avoid is deep winter, when saturated clay makes clean trenching difficult and backfill settles badly.
For lawns, low-precipitation-rate rotary nozzles on Zone 8b clay soils, run on cycle-and-soak schedules. For beds and foundation plantings, inline drip — it delivers water below the canopy, which matters a lot here because overhead watering on rhododendrons, laurels, and roses in our humidity drives foliar disease. Pair either with a weather-based smart controller. Whatever type you choose, everything downstream of the meter needs an approved backflow assembly in Lake Oswego.
Yes, and it’s stricter than most states. Oregon requires two distinct licenses through the Landscape Contractors Board — an individual Landscape Construction Professional license held by the person who passes the exams and supervises work, and a Landscape Contracting Business license held by the contracting entity, which carries the bonding, insurance, and workers’ compensation. Irrigation work specifically requires LCB licensure — even repairing an existing sprinkler system is considered landscape construction work under Oregon rules. Oregon’s administrative rules also require the landscape contracting business to obtain the required permit — or confirm in writing that the owner or general contractor already has it — before installing a backflow assembly for an irrigation system or water feature, or low-voltage wiring for irrigation or landscape lighting.
HD Landscape and Maintenance LLC 6581 SW 192nd Ave Aloha, OR 97007
Phone: (971) 336-5520
Email: hdlandscapellc@gmail.com
Hours: Monday–Saturday, 7:00 a.m. – 7:00 p.m. · Sunday, Closed
License: Oregon LCB #9977
Serving Lake Oswego and surrounding areas including Lake Grove, Palisades, Mountain Park, First Addition, Old Town, and Glenmorrie, plus West Linn, Oregon City, Tualatin, Wilsonville, and the greater Portland metro area.