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The Westin Seattle Ballroom Capacities, Meeting Rooms & Floorplate Specs (47,541 Sq. Ft.)
Verified specs for 24 meeting rooms and the 18,031 sq. ft. main ballroom in Seattle, WA.
The Westin Seattle — Ballroom, Foyer & Breakout Capacity Matrix
47,541 sq. ft. total event space across 24 dedicated meeting rooms.
| Functional Space Tier | Sq. Ft. | Ceiling | Theater | Banquet (10s) | Classroom | 10×10 Booths | Rental Waiver Rule |
|---|---|---|---|---|---|---|---|
| Grand Pillarless Ballroom (Main General Session) Keynote, General Session & Plated Gala Anchor | 18,031 sq. ft. | 22'–26' Clear | 1,898 | 1,336 | 1,127 | 90 booths | $0 Rental w/ $28,000 F&B Min |
| Junior Ballroom & Divisional Plated Dining Hall Luncheons, Partner Summits & VIP Receptions | 8,655 sq. ft. | 18'–22' Clear | 911 | 641 | 541 | 43 booths | $0 Rental w/ $14,000 F&B Min |
| Pre-Function Registration & Sponsor Showcase Concourse Badge Pickup, Tabletop Sponsors & Networking Breaks | 8,557 sq. ft. | 16'–24' Atrium | 713 | 570 | 428 | 43 booths | Included w/ Grand Ballroom License |
| Executive Breakout & Boardroom Wing (24 Rooms Total) 1-on-1 Enterprise Deal Rooms, Track Breakouts & Speaker Ready | 2,400 sq. ft. | 12'–16' Clear | 240 | 171 | 141 | 12 booths | $0 w/ 50+ Peak Night Room Block |
The Westin Seattle — 8-Row Master Property & Group Contract Summary
Guest Room Inventory & Peak Group Allocation
891 Total Keys · Up to 374 Peak Group Block Rooms
Standard 1-per-40 cumulative complimentary room credit; request 1-per-35 comp ratio + 3 VIP suite upgrades at group rates during RFP.
Total Event Space & Breakout Room Ratio
47,541 Sq. Ft. Total · 24 Dedicated Meeting & Breakout Rooms
Optimal for 535–1,898 attendee conferences requiring simultaneous keynote and breakout tracks.
Largest Pillarless Ballroom Capacity
18,031 Sq. Ft. · 1,898 Theater · 1,336 Plated Banquet
Divisible soundproof airwalls; supports up to 90 standard 10×10 tabletop/exhibit booths (~200 gross sq. ft./booth) with 24-hour hold option.
Primary Convention Campus Connectivity
Seattle Convention Center (Arch & Summit) (8–12 min official show shuttle / rideshare)
Primary headquarter and exhibitor room-block anchor serving Seattle Convention Center (Arch & Summit).
Airport Transfer & Motorcoach Staging
SEA (Seattle-Tacoma International Airport) · 13.8 mi (20 mins off-peak / 35–48 mins peak)
Dedicated group porte-cochere / motorcoach staging lane available with 14-day advance manifest submission to hotel convention services.
Nightly Room Rate, Resort Fee & Tax Structure
$265/nt Group Block vs. $439/nt Peak Rack · 15.7% Seattle Convention Center & King County Tax
Mandatory $28/nt resort/destination fee is 100% waived when contracted through the Conventions.com Housing Desk (saves $233/room/night all-in).
Banquet F&B '++' Multiplier & Catering Minimums
$28,000 Ballroom Waiver Min · 25% Service + 10.25% Tax (+37.8% Effective)
Contract F&B minimums on a cumulative multi-day program basis (breakfasts + breaks + reception combined) rather than per-room/per-day minimums.
Attrition, Cutoff & Cancellation Protection
80% Cumulative Pickup Allowance · 30-Day Cutoff · 100% Rebooking Resell Credit
Always insist on cumulative (not night-by-night) attrition calculation and a 'Resell Mitigation Clause' crediting any rooms resold by the hotel after cutoff.