- Professional aeration and overseeding for a typical Pacific Northwest quarter-acre lawn typically runs $400-$800 as a combined service.
- The combined service includes core aeration, quality seed broadcast at the right rate, starter fertilizer, and site assessment.
- Lawn size is the most predictable cost driver; soil condition, site access, seed quality tier, and slope all create variation.
- DIY runs $200-$400 for the same scope after factoring in aerator rental and quality seed.
- DIY works for smaller flat lawns; professional service makes more sense at 5,000+ sq ft, sloped sites, or for time-constrained homeowners.
- Professional-grade seed blends cost more than generic box-store seed but typically produce 2-3x better establishment.
- The cost shows up annually because aeration is a yearly task; budget for it as a known fall expense rather than a variable one.
Professional lawn aeration paired with overseeding for a typical quarter-acre Pacific Northwest yard runs $400-$800 as a combined service. Aeration alone for the same lawn typically costs $200-$400, and overseeding alone falls in a similar range — but the two services usually get priced together because they’re done in the same visit for optimal results. The cost includes equipment, materials (seed and starter fertilizer when bundled), labor, and disposal of any debris. DIY runs $200-$400 for the same scope when factoring in aerator rental, seed, fertilizer, and disposal. The premium for professional service typically pays for crew efficiency, equipment scale, materials quality, and the time saved during a busy fall season — plus the consistency of work done by crews who do this dozens of times each season.
What does professional aeration and overseeding include?
A standard fall aeration-plus-overseed visit across the Seattle Metro Area includes:
- Core aeration at roughly 3-inch spacing across the lawn — actual soil plugs removed, not spike aeration
- Quality seed broadcast at the appropriate rate for overseeding (4-6 lbs per 1,000 sq ft) or renovation (8-10 lbs)
- Starter fertilizer application matched to the new seed establishment
- Site assessment to confirm timing and identify any specific lawn issues
- Quality seed blend matched to the lawn’s sun pattern (perennial ryegrass, tall fescue, fine fescue, or Kentucky bluegrass combinations)
- Light watering to settle the seed if fall rains haven’t started yet
What’s typically not included in standard pricing:
- Pre-aeration mowing (most lawns are already at appropriate height)
- Dethatching when needed (separate service)
- Lime application (separate fall service)
- Drainage work if drainage issues affect lawn performance
The combined service runs around 60-90 minutes of crew time on-site for a typical quarter-acre yard. The full service approach is documented in the lawn aeration timing guide.
What drives the cost difference between properties?
Five factors shape pricing for aeration and overseeding work:
Lawn size. The most predictable cost driver. Sub-2,000 sq ft lawns price at the lower end; 5,000+ sq ft lawns scale proportionally. Very small lawns may have minimum charges that make per-square-foot cost less favorable than larger jobs.
Soil condition. Heavily compacted soils require more aeration passes than moderately compacted soils. Some lawns benefit from twice-per-year aeration; that affects annual cost rather than per-visit cost.
Site access. Lawns reachable from driveway access cost less than lawns requiring equipment carry through tight gates or up stairs. Difficult access can add 20-30% to crew time.
Seed quality tier. Professional-grade seed blends matched to PNW conditions cost meaningfully more than generic box-store seed. The cost difference is real but the establishment difference is substantial — professional seed typically produces 2-3x better fill-in.
Slope. Sloped lawns require more careful aeration work and accept seed less reliably. Steeper slopes may need different equipment or additional passes.
The overseeding timing guide covers seed selection considerations in detail.
DIY versus professional — which makes sense?
DIY aeration and overseeding can work for committed homeowners with appropriate properties:
DIY makes sense when:
- The lawn is under 3,000 sq ft and roughly rectangular
- You can rent a core aerator and have a full Saturday available
- You’re willing to source quality seed (avoiding box-store generic blends)
- The lawn is on relatively flat ground
Professional service makes sense when:
- The lawn is over 5,000 sq ft or includes significant slope
- Multiple zones require different seed mixes (sun and shade)
- You’re already paying for ongoing Landscape Maintenance and aeration is part of the program
- Time is the limiting resource and fall weekends are already committed
The DIY cost saving on a small flat lawn is real — roughly $100-$200. On a larger or more complex lawn, the saving narrows or disappears once you factor in equipment rental, vehicle/trailer for transport, and the time investment.
