Walk past a hundred backyard structures and you will notice that a handful of them look permanent while the rest look assembled. The difference is almost never the roof or the finish. It is the frame, and specifically how the pieces of that frame meet each other.
A timber frame pavilion is defined by that meeting point. Instead of relying on steel plates and screws to hold posts and beams together, the timbers are cut to interlock, then locked in place. The result carries load differently, ages differently and reads differently from the yard.
Understanding what you are buying makes the quotes you receive far easier to compare, because two suppliers can both say “timber frame pavilion” and be describing very different products.
What a Timber Frame Pavilion Actually Is
A timber frame pavilion is a freestanding, solid-roofed outdoor structure built from heavy sawn timbers joined with traditional woodworking joints rather than mechanical connectors. The frame itself carries the load, so there is no hidden stud wall or steel skeleton doing the real work.
The visible frame is the structure. That is why the timbers are large, why the joints are exposed, and why the whole thing looks the way it does from underneath.
How It Differs From a Pergola
The distinction that matters most is the roof. A pergola has open rafters and gives you dappled shade, while a pavilion has a solid, pitched, weathertight roof and gives you a dry space underneath.
That single difference drives everything else. Solid roofs mean real snow and wind loads, which means deeper beams, closer post spacing and substantially more concrete in the ground. It is why a pavilion of the same footprint typically costs two to three times what a pergola does.
How It Differs From a Stick-Built Gazebo
A stick-built structure uses many small members, usually dimensional lumber, sheathed and clad so the framing disappears behind a finished surface. A timber frame uses fewer, larger members and leaves them on display.
Neither approach is wrong, but they age differently. Concealed framing depends on the cladding staying sound, whereas an exposed frame can be inspected, cleaned and refinished for its entire service life.
The Joinery Is the Product
When you pay a premium for timber framing, the joinery is where the money goes. It is worth knowing what you are looking at.
Mortise and Tenon
The core joint is a mortise and tenon, where a projecting tongue cut on one timber slots into a corresponding pocket cut in another. Cut accurately, the joint transfers load through wood-to-wood bearing rather than through a fastener in shear.
Related joints you will see on a quality frame include the housed dovetail at rafter connections, the scarf joint where two timbers join end to end, and knee braces at every post-to-beam corner to resist racking.
Pegs Versus Fasteners
Traditional frames are pinned with hardwood pegs driven through offset holes, which draws the joint tight as the peg seats. This is the detail most often skipped on budget builds.
Some suppliers use structural screws or concealed steel plates and still call the result a timber frame. That can be perfectly sound engineering, but it is a different product and should be priced as one. Ask directly how the joints are secured and whether any steel is concealed inside them.
Green Timber Versus Kiln Dried
Timber frames are commonly built from green timber, meaning wood that has not been dried before cutting. Green timber cuts cleanly and is less expensive, but it will check and season in place, developing surface cracks along the grain and shrinking slightly across its width over the first few years.
Kiln-dried or air-dried timber moves far less and holds tight joints, but it costs more and is harder to source in large sections. Neither is a defect. What matters is that you know which you are getting, because a client expecting a flawless surface who receives a green frame will be disappointed by a completely normal process.
Choosing Your Timber Species
Species affects appearance, durability, weight and price roughly in that order of visibility, though durability is what determines how the structure looks in fifteen years.
The species you will see most often on quotes are these:
- Douglas fir offers the best all-round balance of strength, straightness and price, and is the default for most large frames.
- Western red cedar brings natural rot and insect resistance plus a lighter weight, making it a strong choice in wet climates, though it is softer and dents more easily.
- White oak is the most durable and the most expensive, exceptionally strong, very heavy and traditionally used in the oldest surviving frames.
- Southern yellow pine is dense and strong at a moderate price, but it requires pressure treatment for outdoor exposure and takes finish unevenly.
- Glulam and engineered timber deliver long clear spans with minimal movement and no checking, at the cost of the natural character of solid sawn stock.
Ask what grade you are getting alongside the species. A select structural grade Douglas fir and a number two grade Douglas fir look noticeably different once the frame is standing.
Weight Classes Change the Price More Than Anything Else
Most suppliers organise their range by the section size of the timbers, and this is the variable that moves a quote the most.
Heavy timber frames use large sections, commonly 200mm by 200mm posts and beams or larger, and carry the visual mass people usually picture when they think of a pavilion. Light timber ranges use smaller sections, often around 150mm by 150mm, with tighter post spacing to compensate.
A Timber Frame Pavilion (Lt) sits in that lighter category and suits a lot of residential projects better than people expect. Smaller sections mean less weight to crane, simpler footings, faster assembly and a considerably lower delivered cost, while keeping genuine joinery rather than dropping to bolted connections. On a small suburban lot, a heavy frame can also look overbuilt beside a modest house, so the lighter range is sometimes the better aesthetic call as well as the cheaper one.
Where heavy timber earns its price is on long spans, exposed sites, high snow regions and larger footprints above roughly 6 by 6 metres.
Sizing the Pavilion to Its Job
Footprint decisions are easier when you start from the furniture rather than from a round number.
For reference, these sizes suit these uses:
- 3m by 3m works as a hot tub cover, a two-chair sitting area or a grill station.
- 3.5m by 5m takes a six-seat dining table with room to pull chairs out.
- 5m by 6m handles a dining table plus a separate lounge seating group.
- 6m by 8m and above supports an outdoor kitchen run, dining and lounge zones together.
Add at least 900mm of clearance beyond your furniture footprint on every side, and more on whichever side you will walk in from. Rain blows in at the edges too, so a table pushed hard against the perimeter will get wet in a storm even under a solid roof.
Head height deserves attention as well. Post heights of 2.4 metres to the beam feel tight under a solid roof, and most pavilions sit better at 2.7 metres or above.
Roof, Pitch and Overhang
Roof design does more for the finished look than any other single decision, and it is fixed once the frame is cut.
Gable roofs are the most common and give you the tall interior volume that makes a pavilion feel generous. Hip roofs shed wind better from all directions and read as slightly more formal. Single-slope shed roofs suit modern homes and cost less.
Pitch drives proportion. Anything below about 4:12 starts to look flat and shallow under a heavy frame, while 6:12 to 8:12 gives most pavilions their character. Steeper pitches shed snow more readily but add height, material and cost.
Overhangs are where budget builds usually get trimmed, and it shows. Generous eaves of 400mm to 600mm protect the posts, keep rain off the perimeter seating and are a large part of why some pavilions look substantial and others look thin.
Foundations and Anchoring
A heavy frame with a solid roof exerts serious uplift and overturning forces, so the connection to the ground is not a detail to economise on.
Concrete piers below the frost line are the standard solution, with post bases that hold the timber clear of standing water. Full slabs work well when you want a finished floor surface and the pavilion is your primary outdoor living area. Helical piles are increasingly used where excavation is difficult or the soil is poor.
Whichever route you take, insist on standoff post bases rather than posts set directly onto or into concrete. Timber sitting in trapped moisture will fail from the bottom up long before anything else in the structure does.
Kit, Custom or Full Service
Suppliers generally sell in three ways, and the right choice depends on your skills, your access and your timeline.
Precut kits arrive with joinery already cut, numbered and ready to assemble, which suits capable DIY builders with help and lifting equipment available. Custom frames are designed to your dimensions and site, cost more and take longer, but they solve awkward sites and specific design goals. Full-service builds include design, permitting, foundations and installation, and are the only realistic option for most people on larger frames.
Be honest about the raise. Timber frames are heavy, and lifting a bent into place is not a two-person job. Factor in equipment hire and helpers before you assume a kit is the cheaper route.
Cold Climate Builds Need a Different Specification
Snow load is the variable that reshapes a pavilion design more than any other, because snow does not run off. It accumulates, it drifts unevenly, and wet spring snow is dramatically heavier than the dry powder people picture.
That changes beam depth, rafter spacing, post sizing and footing depth all at once. A model that performs well in a mild region can be structurally inadequate a few hundred kilometres north, even though the drawings look identical.
This is why a Timber Frame Pavilion (Light Timber) for Canada is engineered to different numbers than the same range sold in warmer markets, with tighter member spacing and deeper footings to reach frost depth. When you request a quote, give the supplier your exact location rather than a general region, since ground snow loads vary sharply over short distances and the local figure is what your permit will be assessed against.
Also plan where the snow goes once it slides. Keep the shedding edge away from doorways, walkways and anything you park underneath.
Permits, Setbacks and Siting
Because a pavilion has a solid roof, most jurisdictions classify it differently from an open pergola. Expect a permit requirement on anything with a fixed roof above a modest footprint.
Check setback distances from property lines, easements and septic fields before you finalise a location. Also check whether your structure counts toward lot coverage limits, because that catches people out on smaller urban lots.
Siting decisions worth making before the frame is ordered include the direction of afternoon sun, the prevailing wind, sightlines from your main living windows, and the run distance for any electrical or gas services you plan to add later. Running a conduit before the slab goes down costs very little. Adding it afterwards is a demolition job.
Finishing and Maintenance
Exposed timber needs a finish schedule, and the first one should go on before or immediately after the raise, while every surface is still accessible.
Penetrating oil finishes are the most common choice because they refresh easily without stripping, typically needing recoating every two to three years on sun-exposed faces. Film-forming stains and varnishes last longer initially but eventually peel and require sanding back. Leaving the frame unfinished is a legitimate option with naturally durable species, and it will silver to a soft grey, though the checking will be more pronounced.
Ongoing maintenance is light. Clear debris from the roof and gutters twice a year, inspect the post bases annually for trapped moisture or debris buildup, and recoat exposed elevations on schedule rather than waiting for them to look tired.