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How to Build a Garage Pergola

Use milled brackets and pressure-treated lumber to create an elegant canopy over your garage door

The garage door is the first thing most of us see when we arrive home, so it better be a sight worthy of admiration. Impossible? Not at all: Perching a pergola upon shapely brackets adds architectural dimension and intriguing shadow lines to this otherwise utilitarian entry point. Our approach calls for mounting ready-made brackets to the door's casing—and the framing behind it—then attaching an assembly of rafters and purlins shaped to complement your home's existing trim. Follow along as This Old House senior technical editor Mark Powers guides you through making this decorative structure, which looks as good freshly installed as it would draped in flowering vines.

Brackets: Port Orford cedar Original style end bracket, about $88, and Contemporary style center support, about $55, Auer-Jordan.

Download and print the cut list.


Steps // How to Build a Garage Pergola
1 ×

Overview

 
Step One // How to Build a Garage Pergola

Overview

illustration of garage door pergola construction
Illustration by Gregory Nemec

Day-to-day timeline

SATURDAY Make the parts (Steps 1–4).
SUNDAY Build and install the pergola (Steps 5–12).

Download and print the cut list.

Cut List for Building a Garage Pergola

Designed to fit over a one-car garage, this pergola measures 144 inches wide by 28 inches deep by 29 inches tall.

2x4 pressure-treated boards for the rafters: Cut to fit; ours measured 12 feet.

2x2 pressure-treated balusters for the purlins: Cut to fit; ours measured 28 inches.

 
2 ×

Design the Rafter Tail

 
Step Two // How to Build a Garage Pergola

Design the Rafter Tail

Mark Powers traces along the can to create the curved detail on the rafter tail
Photo by Kolin Smith

Clamp a 2x4 to your work surface. Use a combination square to measure and mark lines across the board 1 and 4 inches from its end. On the 1-inch line, make a tick mark 1½ inches from the top edge of the rafter. Now, position a 1-gallon paint can so that its arc connects the tick mark and the point where the 4-inch line meets the rafter's bottom edge. Trace along the can to create the curved detail on your rafter tail, as shown.

 
3 ×

Cut the Tails

 
Step Three // How to Build a Garage Pergola

Cut the Tails

Mark Powers follows the cut line with a jigsaw to shape the tail
Photo by Kolin Smith

Follow the line with a jigsaw to shape the tail, then use the piece as a template to trace the detail onto the uncut ends of the other boards. Cut the marked tails and use one of them to mark and shape the uncut end of the template board. Sand the curved cuts lightly with 120-grit paper.

 
4 ×

Shape the Purlins

 
Step Four // How to Build a Garage Pergola

Shape the Purlins

Mark Powers cuts the miter to shape the purlins
Photo by Kolin Smith

Take the first 2x2 and use a combination square to draw a 45-degree line across one corner, ½ inch below its top edge. Set the blade of a miter saw to 45 degrees, slide the piece along the fence until the mark lines up under the blade, and hold it firmly in place. Pencil a reference line on the saw bed at the end of the purlin. Cut the corner. Position each of the remaining pieces at your reference line, then make the miter, as shown.

 
5 ×

Stain the Parts

 
Step Five // How to Build a Garage Pergola

Stain the Parts

Mark Powers applies stain to a purlin
Photo by Kolin Smith

Lightly sand the purlins and the three brackets with 120-grit paper. Stir the stain thoroughly and brush a thin coat onto all sides of each part. When dry, recoat the pieces and allow the stain to cure.

 
6 ×

Lay Out the Holes

 
Step Six // How to Build a Garage Pergola

Lay Out the Holes

Mark Powers uses a bit extender with a flexible shaft to drill the countersinks
Photo by Kolin Smith

Use a drill/driver fitted with a combination countersink bit to bore a pair of evenly spaced holes near the top and bottom of each of the three brackets. Locate the holes at least ½ inch from the edges of the bracket. If the arm of the bracket is in your way at the top, use a bit extender with a flexible shaft to drill the countersinks, as shown.

Tip: Buy brackets the same width as the casing around your garage door to ensure a seamless look and easy installation.

 
7 ×

Anchor the Brackets

 
Step Seven // How to Build a Garage Pergola

Anchor the Brackets

Mark Powers anchors the bracket to attach to the garage door casing
Photo by Kolin Smith

Apply caulk to the back of the first bracket and hold it in position, flush to the inside of the garage door casing. Using a ⅛-inch bit, drill a pilot hole through one of the bottom countersinks, then drive a 3½-inch deck screw through the bracket and casing and into the framing, as shown.

 
8 ×

Plumb the Brackets

 
Step Eight // How to Build a Garage Pergola

Plumb the Brackets

Mark Powers uses a level to plumb the bracket
Photo by Kolin Smith

Use a level to plumb the bracket, then draw a reference line on the head casing, as shown. Holding the bracket plumb at the line, drill pilot holes through the three open countersinks. Secure the bracket with three more 3½-inch deck screws. Squirt a dab of caulk into each screw hole and cap them with ⅜-inch wood plugs to conceal the fasteners. Install the other two brackets.

 
9 ×

Mark the Rafters

 
Step Nine // How to Build a Garage Pergola

Mark the Rafters

Mark Powers marks a spot 6 inches in from each end of each rafter
Photo by Kolin Smith

Gang the rafters together on edge and flush them up at both ends. Use a combination square to mark a spot 6 inches in from each end. Then draw a line across the top of the rafters at the mark, as shown, at each end.

 
10 ×

Clamp the Assembly

 
Step Ten // How to Build a Garage Pergola

Clamp the Assembly

Mark Powers clamps the rafter assembly
Photo by Kolin Smith

To position the rafters, subtract their total thickness (4½ inches for our three 2x4s) from the depth of the brackets (24 inches) and divide by 4 to get equal spacing on each side of the rafters (4⅞ inches). Cut spacer blocks to length and wedge them between the rafters. Clamp the assembly together, using scraps as cauls to protect the fresh stain.

 
11 ×

Install the Purlins

 
Step Eleven // How to Build a Garage Pergola

Install the Purlins

Mark Powers attaches the purlins with the help of a T-shaped block
Photo by Kolin Smith

Subtract the total thickness of 14 purlins from the distance between the end marks from Step 10 and divide by 13 spaces. Cut one spacer block to match that spacing; make a T-shaped block to set the rear overhang. Be sure that the backs of the purlins do not extend past the bracket plates. Install the end purlins inside their lines and work toward the middle, using the blocks to set the spacing, as shown. Drill pilot holes and secure with 2½-inch deck screws.

 
12 ×

Position the Pergola

 
Step Twelve // How to Build a Garage Pergola

Position the Pergola

Mark Powers hoists the pergola assembly onto the brackets
Photo by Kolin Smith

Measure and mark the midpoint of your pergola on the face of the front rafter. With a helper, hoist it onto the brackets. Shift the pergola to align the mark with the middle of the center bracket.

 
13 ×

Fasten the Pergola

 
Step Thirteen // How to Build a Garage Pergola

Fasten the Pergola

Mark Powers attaches the pergola to the brackets
Photo by Kolin Smith

Standing on a ladder, clamp the pergola to the brackets, keeping the back of each purlin a good ¼ inch from the siding. Use a combination bit to bore angled pilot holes through the sides of the rafters and into the brackets. Use 3½-inch deck screws to fasten the pergola in place.

 
 
 

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