What size pergola do I need for an outdoor dining table or a lounge set?
Short answer
Measure the furniture, then add room to pull out chairs and walk around. A six-seat rectangular table typically wants a shade footprint close to ten by fourteen feet so nobody sits half in the sun. A sofa, two chairs and a coffee table usually fit under twelve by twelve to twelve by sixteen. Shade moves across the ground through the day, so a pergola sized exactly to the furniture leaves someone in the sun. Size the footprint to the shadow, not the rug.
Start with the furniture, then add the people
A pergola that is too small is the most common mistake we see, and it is hard to fix later. The frame looks fine in photos, then someone pulls out a chair and bumps a post, or the end of the table sits in full sun at dinner.
Measure the furniture you own or plan to buy. Then add clearance. A dining chair needs roughly three feet behind it to slide out and let someone walk past. A lounge chair wants a foot or two of breathing room on each side. Those clearances, not the furniture itself, drive the footprint.
Dining tables
A table for six is often around three feet wide and six to seven feet long. Add three feet on every side for chairs and circulation and you are near nine by twelve or ten by thirteen. Round up to the next comfortable post spacing, and a ten by fourteen footprint is typical.
A table for eight pushes toward ten by sixteen. If the table sits against a wall or a planter on one side, you can trim the clearance on that side to a foot or so, since no one sits there.
Also think about the grill or a serving counter. If it lives under the pergola, plan a separate zone for it so smoke rises away from the table and the cook has room to work.
Lounge sets
A sofa and two chairs around a coffee table usually fill a twelve by twelve square, with room to walk behind the seating. A sectional wants a bit more in one direction, often twelve by fourteen or twelve by sixteen.
Lounges are used later in the day, so shade matters even more than for a lunch table. Size the pergola a little generously in the direction of the low sun. In North County that is usually to the west, so a few extra feet on the west side will keep the sofa shaded at five in the evening.
Shade moves, so size for the shadow
The shadow of a pergola is not a rectangle under it. It shifts east in the afternoon and north in winter, and it stretches as the sun drops. A pergola sized exactly to the furniture will put the far end of the table in the sun for part of the day.
Our rule of thumb is to extend the pergola two to three feet past the furniture in the direction of the sun you most want to block. If the frame is attached to the house and the sun comes from the opposite side, you can lean the overhang that way too. Rafter tails that run past the beam add shade at the edge without adding posts.
Proportion and the yard
A pergola should also fit the space around it. Leave a walkway of three feet or more between the posts and any fence, pool edge or planter. If the pergola sits on a deck, let the deck run past the posts so the structure does not feel like it is balancing on the edge.
Post spacing affects beam size. Spans beyond twelve feet typically call for deeper or doubled beams, which changes the look. We usually design the pergola, the deck and the furniture layout as one drawing so the posts land where they belong and nobody bumps a knee.
If you are between sizes, go larger. Nobody has ever told us their pergola was too big.
- Table for six: roughly 10 by 14 feet of shade
- Table for eight: roughly 10 by 16 feet
- Sofa plus two chairs: roughly 12 by 12 feet
- Sectional: roughly 12 by 14 to 12 by 16 feet
- Add 2 to 3 feet toward the sun you want to block
Related questions
Can a pergola be too big for a backyard?
It can overwhelm a small yard or shade rooms inside the house more than you want. Keep three feet of open walkway around it and leave some sky visible from the main windows. Within those limits, larger is usually better than smaller.
How far apart can pergola posts be?
It depends on the beam. Spans up to about twelve feet are comfortable with doubled two-by lumber. Longer spans call for deeper beams, laminated members or steel, and it is worth having the sizing checked for your case.
Should the pergola cover the grill?
Only if it has its own zone with room for smoke and heat to clear the rafters. Many homeowners put the grill just outside the pergola edge, where the cook still gets some shade and the wood stays clean.