Shade Sail Posts & Mounting
Handis shade sail post and mounting puts the structural rigging for a residential shade sail (triangular or rectangular sun-shade fabric) on a deck, patio, or backyard — cedar or aluminum posts set in concrete footings, marine-grade 316-stainless eye-bolts and turnbuckles at every corner anchor, 3-anchor and 4-anchor configurations — from $800 for a 1-to-3 anchor mount on existing eaves, decks, or posts to $2,500 for a four-post 6x6 cedar post system in concrete. Shade sails are the budget shade fix — a $200 to $600 fabric sail tensioned between three or four anchor points casts a triangular or rectangular shaded area on the deck or patio below, with the sail going up the first weekend of June and coming down the first weekend of October as the PNW summer cycle dictates. The structural rigging is the part that matters — the sail fabric is bring-your-own (Handis installs the rigging, the homeowner buys and changes the sail), and the right post-and-eye-bolt configuration is what keeps the sail tensioned correctly through 4 to 5 months of summer wind and prevents the corner anchor pulling out of the eave or the post in a gust.
Service
How a Shade Sail Post Install Works
Six sequential steps from site review through seasonal-tension handoff — the actual sequence we follow on every shade-sail post and mounting install.
Site Review and Anchor-Layout Planning
Tech walks the deck or patio, confirms the area to be shaded, identifies the available anchor points (existing eaves, existing posts, where new posts can go), recommends the sail configuration (3-anchor triangular for simpler installs, 4-anchor rectangular for larger shaded area), and confirms the anchor-to-anchor distances against the homeowner's planned sail size. Structural review of any existing structure that will receive an anchor — eave rafter, deck rail, existing post.
New-Post Installs — Power-Auger Footings, 48-Hour Cure
On new-post installs, power-auger every footing to 24 to 30 inches below grade with the diameter sized to the post and the wind-load on the planned sail. Pour ready-mix concrete around Simpson ABA or ABU post-base anchors set plumb in the wet pour. 48-hour concrete cure before the post is raised. Retrofit installs (mounting on existing structures) skip this step.
Raise the Cedar or Aluminum Posts
Cedar 4x4 or 6x6 posts (or aluminum posts) lifted onto the cured ABU anchors and through-bolted with the post-base hardware. Each post plumbed against a 4-foot level on two faces. Post height cut to spec (typically 9 to 12 feet so the sail tensions high enough for standing-headroom shade). Posts braced against any movement until the eye-bolts are installed.
Install Marine-Grade 316-Stainless Eye-Bolts
Marine-grade 316-stainless eye-bolts installed at the top of each post — drilled and through-bolted (cedar posts) or welded-to-bracket-and-bolted (aluminum posts), with the eye facing the sail direction. The eye-bolt takes the full sail tension at the corner — typically 100 to 300 pounds at full sail load on a windy day, more on larger sails. 316 grade chosen for the corrosion resistance through PNW winters.
Install Forged 316-Stainless Turnbuckles
Forged 316-stainless turnbuckles rigged between the eye-bolts and the sail-corner D-rings — the turnbuckle adjusts the sail tension for seasonal tightening and slackening (sails are slacked over winter when removed and re-tensioned each spring). Turnbuckle sizing matches the eye-bolt and the sail-corner hardware. Carabiners and quick-release snap shackles available as an upgrade for easier seasonal removal.
Demonstrate Seasonal Tension and Hand Off
With the sail rigged (using the homeowner's purchased sail), demonstrate the turnbuckle tension adjustment — how to tension the sail correctly (taut but not over-tensioned, with a slight visible curve to the sail face) and how to slacken or remove the sail for winter storage. Written care sheet covering tension target, seasonal removal recommendation, and storage instructions. The homeowner manages the sail for the life of the install.
Shade Sail Posts & Mounting Pricing
Final pricing depends on the number of anchors (1 to 4 corner anchors), whether the install is on new posts in concrete footings or retrofit on existing structures, post material (cedar standard, aluminum upgrade), post size (4x4 standard, 6x6 heavy-duty), and any add-ons (carabiners or snap shackles for easier seasonal removal). Shade-sail fabric is homeowner-supplied. Request a free estimate for an accurate quote.
Tell us the area to be shaded and where the corner anchors can land (existing eaves and posts, plus any spots a new post can go) — we will quote the post-and-mounting build with the right cedar-or-aluminum spec for the wind load.
Why Handis for Shade Sail Post & Mounting Installs
Shade sails are the simplest shade infrastructure in the pergola-and-shade family — and the lowest cost on this hub, which is exactly why some homeowners pick them. A 4-month summer in the PNW does not justify a $12,000 louvered system for every yard; a $800 to $2,500 shade-sail post system plus a $200 to $400 fabric sail covers the same June-through-September shading need at a fraction of the cost. The trade-off is the seasonal labor (the sail goes up the first weekend of June and comes down the first weekend of October before the wet wind season — leaving the sail up year-round is what shreds it in November) and the lower visual permanence (a shade sail is fabric, not architecture). The right scope split is the structural rigging done permanently and correctly (Handis), and the sail itself owned and managed seasonally by the homeowner (you pick the size, color, fabric; you put it up and take it down). That split is honest about who is the right party for each piece of the work.
Estimate
Tell us the area you want shaded (the deck dining area, the patio seating cluster, the kids' play area), the anchor options you have (existing eaves on the house, existing pergola or fence posts, places in the lawn or patio where new posts can go), the planned sail size and shape if you have one in mind (triangular 12-foot sides, rectangular 10 by 14, square 12 by 12, etc.), and the seasonal-use plan (summer-only or year-round). We confirm the anchor structural review and the post-size spec on the first visit.
Customer Reviews
Shade sail post and mounting reviews from real Handis customers.
Four-post 6x6 cedar shade-sail system over our paver patio in Issaquah — we get strong afternoon sun and wanted real shade without committing to a full pergola. Handis set the four posts in concrete footings, ran the marine-grade 316-stainless eye-bolts at the top of each post, and rigged the rectangular sail we had already bought from Coolaroo. Sail goes up the first weekend of June, comes down first weekend of October, and the posts read clean as a furniture piece in the off-season.
Three-anchor retrofit mount on our Magnolia deck — two existing eaves on the house and one new 4x4 cedar post in the corner of the deck for the third anchor. Handis structural-reviewed the eaves (one needed a small blocking reinforcement, $250 add-on), installed the 316-stainless eye-bolts and turnbuckles, and we hung our triangular Coolaroo sail. The shade lands exactly on the dining table where we needed it. $1,100 done.
Mounting-hardware-only retrofit on our Bellevue deck — three anchors on the existing covered patio cover posts and the eave of the garage. No new posts needed because the existing structures could take the load. Handis confirmed the structural review on each anchor, installed the eye-bolts and turnbuckles in a half-day visit, and walked us through the seasonal tension. $800 done, fast turnaround.
Two new 4x4 cedar posts plus two retrofit anchors on existing fence posts in our Ballard backyard. Handis set the two new posts in concrete on the property line side, used the existing 4x4 fence posts on the house side for the other two anchors, and rigged the rectangular sail we bought on Amazon. Marine 316 stainless on every anchor — the turnbuckles still adjust smoothly three years in. Sail goes up and down every season without trouble.
Aluminum-post upgrade on our Mercer Island patio — wanted the modern look so we paid the per-post upgrade ($300 per post on four posts) for powder-coated aluminum posts instead of cedar. Custom dark grey powder-coat color upgrade to match the house trim. Marine-grade 316-stainless eye-bolts and turnbuckles same as the cedar configuration. Posts read clean and contemporary year-round.
Frequently Asked Questions
Common questions about Handis shade sail post and mounting installs.