Our Project Portfolio

Beautiful manufactured home in Lebanon Oregon with a garage and pit-set. Home was sold by Clayton Homes in Albany, OR and site work, installation was performed by 3 A Construction LLC

Manufactured home in Lebanon Oregon. This is considered a Front Loader/End Loader since the front door is on the end of the home instead of the sides and it was installed with a site built garage.

Cap-and-Fill Septic System Installation — Lane County, Oregon

A complete on-site wastewater solution engineered for challenging soil conditions

When a property's soil profile won't support a conventional drainfield, the solution requires more than just equipment — it requires a contractor who understands the engineering, the permitting, and the long-term performance of an elevated system. 3-A Construction delivered exactly that on this Lane County project.

The work began where every successful septic system begins: in the ground. Our crew excavated test holes to evaluate soil characteristics and confirm the site called for a cap-and-fill design — an elevated drainfield built up with imported sand fill to provide the vertical separation DEQ requires between effluent and the restrictive soil layer below. From there, we installed a septic pump tank engineered to pressure-dose the elevated field, ensuring even distribution across the entire disposal area.

The heart of the system is 450 linear feet of EZflow gravelless drainfield, laid out with precision trench spacing, bedding, and cover to meet Oregon DEQ specifications and Lane County Land Management requirements. Every component — tank placement, pump sizing, force main, distribution, and final grading — was installed to spec and inspected for compliance. The result is a code-compliant system built to perform reliably for decades on a site that couldn't accommodate a standard gravity drainfield.

Why it matters: Cap-and-fill systems are one of the more technically demanding septic designs in Oregon. They require proper fill material, correct compaction, accurate pump calculations, and strict adherence to DEQ rule 340-071. A system installed incorrectly can fail inspection, fail prematurely, or both — and the cost of redoing one is far higher than the cost of doing it right the first time.

3-A Construction, LLC — CCB #167959 — Licensed Oregon general contractor specializing in manufactured home placement, site development, and septic installation across Lane, Linn, Tillamook, and surrounding counties.

• Location: Salem (Marion County, OR)
• Project Type: Detached Accessory Dwelling Unit (ADU)
• Services Provided: Site Feasibility, Utility Connection, Excavation, Foundation Footings, Home Placement, Skirting, and Permitting.

Project Overview

To generate rental income and maximize property value, a Salem homeowner added a manufactured accessory dwelling unit (ADU) to their suburban backyard. Leveraging Oregon's updated ADU allowances (HB 2001), 3-A Construction, LLC provided a turnkey installation from initial planning to final walk-through.

Challenges & Solutions

• Tight Lot Access: Transporting a manufactured home into an established backyard requires careful maneuvering. Our team completed a site feasibility study, cleared tight-clearance obstacles, and utilized specialized equipment to place the home without damaging the primary house or neighboring structures.
• City Utility Tie-ins: City of Salem regulations require ADUs to connect directly to public water and sewer or tap into the primary dwelling’s lines according to specific structural engineering rules. We handled the plumbing and electrical engineering to tie the ADU into city services.

Scope of Work Completed

• City Permitting: Prepared site plans and coordinated with the City of Salem Community Development Department for planning and building permits.
• Excavation & Foundations: Excavated the backyard site, laid the foundation base, and installed concrete footings.
• Utility Connections: Connected the MFD to the existing sewer, municipal water, and electrical grid.
• Set-up & Skirting: Secured the home with tie-downs, leveled the structure, and finished the exterior with durable block skirting, stairs, and handrails.

Example images of our permitting process

Manufactured home engineered tie downs installed