How to Build a Chicken Coop, Step by Step

Most guides on how to build a chicken coop start with a saw. This one starts with the flock, because the size of the house, the number of nest boxes and the length of the roost all follow from how many hens you keep. Then it walks the build in the order a carpenter works: legs and floor, wall framing, roof, siding and vents, nests and roosts, the pop door, and a covered run with an anti-dig apron. Every measurement comes with the extension service that recommends it, and where those services disagree, we say so.

The worked example all the way through is the default design in our coop designer: a raised 4x8 gable coop for six standard hens, with an 8x8 covered run. Every number we quote for it comes from that design’s flock checks, cut list and materials list, not from a photo or a guess.

Size the coop to the flock before you buy lumber

The first decision in building a chicken coop is floor area, and it is the one where published advice varies most. Get it right on paper and the rest of the build follows.

Floor space inside the coop

The extension services do not agree. Virginia Tech’s 2023 edition of Small-scale Poultry Housing recommends 3 to 4 square feet per laying hen indoors. Penn State’s table still lists 1.5 square feet as the “minimum”, which is the same figure Virginia Tech printed in its 2009 edition and then revised upward in 2023. Oregon State asks for at least 3 square feet per bird when the flock has a run, and 8 to 10 when it has no outdoor access. NC State gives 2.5 to 3.5, UNH at least 3, UGA 3 to 3.5 as a rule of thumb, Kentucky at least 2, and Colorado State’s Boulder County office 2 to 3.

Our designer takes the current Virginia Tech figure, 4 square feet per standard hen with a run, as the target. It turns amber between 3 and 4 (still inside what Oregon State, UNH and UGA accept) and red below 3. If you want to test a size before drawing anything, the chicken coop size calculator runs the same rule.

Run space per hen

The spread is wider outside. Virginia Tech (2023), the national Cooperative Extension site and Colorado State all give 10 square feet per hen in the run. Penn State gives 8, NC State a minimum of 4 to 5, and Kentucky at least 2. The Cooperative Extension page is frank that “such outdoor access densities are not practical in urban settings.” We default to 10 and stay amber down to 4, the bottom of NC State’s range.

Nest boxes and roost length

Count nests from the hens, not from the wall. Oregon State and UNH ask for one box per about four hens, Kentucky sets a floor of two boxes per flock, and UC Davis puts the ceiling at five birds per box. Penn State is more generous: two boxes for the first four hens, then one more for every four after that. Roost length varies just as much: Penn State gives 6 inches per standard bird, Virginia Tech (2023) 8 to 10, and UNH and Colorado State a full 12.

The worked example: six hens in a 4x8

A 4x8 footprint is 32 square feet on the outside, but the walls eat into it. With 2x4 framing and siding, the inside of our default coop measures 41 by 89 inches, which is 25.3 square feet. Measure inside the walls when you check your own design.

You can open this exact design, change the flock or the footprint, and watch every check update in the 4x8 coop for six hens.

Pick the style, the height and the spot

Three choices shape everything you frame later: whether you stand inside or reach in, how far the floor sits above the ground, and where the coop faces.

Raised hutch or walk-in

A hutch is a coop you reach into through doors; a walk-in is one you step inside. No extension service gives an interior height in numbers. Penn State only asks you to “build the roof high enough” for easy access to nests, roosts and feeders. Our designer uses 36 in walls for a hutch and 72 in walls for a walk-in, and below 72 in of width it picks the hutch, because a narrow walk-in leaves little floor once you are standing in it. The 4x8 example is a hutch with 36 in walls under a 6 in 12 gable roof.

How high off the ground

Oregon State says to raise the coop at least 1 foot off the ground and to use a secure floor such as a concrete slab or solid wood. NC State points out two side benefits of a raised house: a dry, shady place underneath for dust baths, and egg collection and cleaning without stooping. UC Davis adds a condition: if hens gather underneath, the floor above them has to be solid so they are not soiled from above.

Our default is 24 in from the ground to the top of the floor. In the 4x8 example that leaves 14.25 in of clear height under the floor frame. Our designer only counts the space under a coop as run when it has at least 18 in of clearance, so here it does not count, and the run is sized on its own.

Where to put it

Penn State advises putting openings on the side away from prevailing winds and says the south or east side is usually best. Pick level, well-drained ground, and set each leg on a solid concrete paver on compacted soil so no wood sits on dirt. Rules on setbacks and flock numbers vary by jurisdiction, so check with your town or county before you dig.

How to build a chicken coop: the base and floor

This is stage one of ten, and the one that decides whether every later cut fits. Take your time here.

Legs, beams and knee braces

The 4x8 example stands on six legs cut from pressure-treated 4x4 rated for ground contact, each 14.25 in long, carrying two 4x4 pressure-treated beams that run the full 96 in. Fix every leg to its beam with a post-to-beam connector and the fasteners its label calls for. Eight 2x4 knee braces, cut at 45 degrees on both ends, tie the corner legs to the beams and stop the frame racking; our plan fixes them with two 3 in screws at each end.

Joists, mesh and subfloor

Two 2x6 pressure-treated rim joists, 96 in long, close the sides, and seven 2x6 pressure-treated floor joists, 45 in long, span between them. Before the floor goes on, fix hardware cloth across the underside of the joists. Utah State recommends heavy-gauge wire mesh under the subfloor to keep predators out, and notes that small rodents get in through holes the size of a nickel or a quarter.

The floor itself is one sheet of 3/4 in tongue-and-groove plywood, laid with its long edge across the joists, glued with construction adhesive and fixed with 2 in exterior screws. Penn State suggests sloping the floor slightly toward the door so it is easier to clean; our designer offers that as an option.

Check square and level

Before any wall goes up, measure both diagonals of the floor (they must match), check level in both directions, and confirm the height to the top of the floor. Every wall you frame next sits on this surface, so an error here carries into the roof.

Frame the walls and the roof

Stages two and three. Frame each wall flat on the floor, stand it up, nail the bottom plate down, and tie the corners together before any rafter goes on.

Wall framing

The 4x8 example has 31.5 in studs in all four walls, a bottom plate, a top plate and a cap plate that laps over the corners. Each wall carries one opening:

• Front wall: a 31 in wide clean-out door that opens flush with the floor, as NC State recommends, so litter sweeps straight out.
• Back wall: a 24.5 in opening for the external nest box.
• Left side wall: the 10 in pop door, with a header made from two 2x6 plies.
• Right side wall: a second clean-out door, 24 in wide, under a header of two 2x6 plies.

Check each wall for plumb and measure its diagonals before the roof goes on.

Rafters, ridge and hurricane ties

The roof is a gable at 6 in 12 with a 6 in overhang. Fourteen 2x6 common rafters, each 35-7/16 in long, meet at a 2x8 ridge board 96 in long, and seven 2x4 rafter ties cross the coop at the plate line so the walls cannot spread. Put a hurricane tie (a rafter-to-plate connector) at every rafter bearing, 14 in all, each fixed with the 10 connector nails its label specifies.

Sheathing and roofing

Two sheets of 7/16 in OSB sheathe the roof, with H-clips between rafters at the unsupported edges. Then come synthetic underlayment, drip edge along the eaves and rakes, a starter strip, the shingles and the ridge cap. On a 4x8 the roof comes to 0.45 of a roofing square, so with 10% for waste the list calls for two bundles of shingles.

Close it in: siding, doors and vents

Stage four turns the frame into a house. Every opening you cut at this stage is a way in for a predator unless it is screened or latched.

Siding and trim

The walls take three 4x8 sheets of panel siding (T1-11 or engineered wood), each one tall enough to cover the floor frame and the wall with no horizontal joint, plus one more sheet for the gable triangles. Nail the siding every 6 in along the edges and every 12 in in the field, put Z-flashing over the door heads and the horizontal joint under the gables, caulk the corners and every opening, then prime and paint. Let the paint cure as long as its label says before the hens move in.

Doors that open the right way and lock

The sources split on door swing. Virginia Tech (2023) says to install doors so they open inward; Oregon State says to hang them so they open toward the outside, which makes it easier to clean every corner. Our designer follows Oregon State, because an outward door takes no floor from the flock.

The clean-out doors in our plan are the siding panels cut from their own openings, backed with a 1x4 Z-frame, hung on 3 in exterior hinges and closed with two-step latches, the raccoon-resistant kind that needs two separate movements to open, rather than a single hook.

Ventilation openings

Here the honest answer is that no extension service gives a ventilation area in numbers. What they do give is position. Penn State says that on small coops, windows or vents on one side usually provide plenty of air, as long as they do not open directly over the roosts. Oregon State says passive ventilation is adequate for most backyard coops and that coops do not need insulation, only no drafts. Utah State puts the upper vents on the side away from the wind, and the Cooperative Extension site describes the chimney effect that pulls air out through a ridge or eave opening.

The number you see everywhere, 1 square foot of vent per 10 square feet of floor, is a builders’ rule of thumb. It appears on Oak Hill Homestead and Coop Vent Calc with no extension number behind it, and The Featherbrain calls it “totally bogus”. We show it in the designer as a guide, never as a pass or fail. The 4x8 example has 3.5 square feet of screened opening against the rule’s 2.5: three of the six eave bays open on each side wall, plus a vent in the back gable, and the bays over the roosts stay blocked. Cover every vent with 1/2 in hardware cloth, screwed every 6 in. The chicken coop ventilation guide has the vent area for every coop size.

Fit out the inside: nests, roosts and the pop door

Stages five and six. These are the parts the hens actually use, and the ones where the measurements from the sizing section turn into wood.

Nest boxes

The 4x8 example has two 12 in nest boxes in one bank mounted outside the back wall, so you collect eggs without opening the coop. The box floor sits 18 in above the coop floor, a 4 in lip holds the bedding in, and the top slopes at 45 degrees, which Oregon State recommends so birds cannot roost on the boxes. The lid hinges along the wall on two hinges and closes with two two-step latches. NC State also suggests a hinged door you can reach from outside.

Height is another split. Utah State asks for at least 18 in off the floor and Colorado State 18 to 20, while Penn State, Maryland and UGA put nests about 2 ft up. We use 18 in because it fits under the plates of a hutch with 36 in walls.

Roost bars and the dropping board

Two roost bars cut from 2x4 laid flat, top edges rounded, run 41 in across the coop: 82 in of roost in all. UC Davis accepts a rounded 2x4 either way up. The bars sit 24 in above the floor, inside the 18 to 24 in that Penn State gives and at the 2 ft that Oregon State gives, and never higher than the 4 ft that Penn State sets as the limit. They are 12 in apart (Penn State’s spacing; Oregon State accepts 10) and 12 in from the wall. Bar width, shape and the rest of the spacing rules are in our guide to roosting bars.

Keep the roost higher than the nest box floor. Maryland and Colorado State want roosts above the nests, though NC State says the opposite and puts roosts below the nest entrance, Oregon State says not to set nests lower than the roosting poles, and UC Davis accepts roosts above the boxes only with a slanted cover over them. The bars drop into cradle blocks so they lift out for cleaning, and a 41 by 36 in dropping board on two ledgers catches the night’s droppings below them. Utah State asks for at least 12 in of clear space under the perches.

Pop door and ramp

No extension service gives a pop door size either. The Featherbrain suggests 10 in wide by 10 to 13 in high, and our default is 10 by 13 in with the sill 6 in above the coop floor, so bedding does not block it. The door slides in 1x2 guides, locks with a 3 in barrel bolt at night, and lifts from outside on a cord and screw eye.

The ramp is 12 in wide and 42-7/16 in long, climbing 30 in to the sill, and it hinges on a cleat so it lifts out of the way for cleaning. Penn State asks for slats spaced 3 in apart, or a rough surface such as a roofing shingle, for grip; our ramp carries nine 1x2 slats.

Build the covered run

Stages seven to ten: four of the ten stages in our plan belong to the run. A run is also where predator-proofing either holds or fails.

Posts and frame

The 8x8 run in the example stands on ten pressure-treated 4x4 posts, set 24 in in the ground in tamped gravel or concrete (deeper where your frost line asks for it), at most 6 ft apart, and braced until they set. The framing stands 72 in tall at the far end and 84 in at the coop. Pressure-treated 2x4 rails run along the ground, more 2x4 rails run along the top and at every joint between mesh bands, and the door opening leaves 64-1/2 in of clear height.

NC State gives three rules we build in: put the wire on the outside of the posts, because “wire secured on the inside of the support posts may be pushed in by a persistent predator”; extend the run at least 6 ft from the coop (this one runs 8 ft); and make it tall enough to enter standing upright.

Hardware cloth walls

The run walls are 1/2 in galvanized hardware cloth, 19 gauge, for the full height. Utah State is blunt about the alternative: “chicken wire is not a barrier to predators”, so use hardware cloth of 1/4 to 1/2 in. UC Davis says openings should not exceed 1/2 in, and has seen mice get through 1/2 in holes. Colorado State goes further and asks for no opening larger than 1/4 in when the coop is closed, and the Cooperative Extension site notes that least weasels squeeze through 1/4 in holes. Our designer offers 1/4 in as an option. No extension gives a gauge, only “heavy-gauge”; 19 gauge is the weight stores sell in 1/2 in mesh.

For the coop and run together, the example needs three rolls (24 in by 100 ft, 36 in by 50 ft and 48 in by 50 ft). On the run, each band is unrolled along the outside of the posts with its edges on the rails and 1 in washer-head screws every 6 in; across every mesh edge on the job, that is about 731 screws. Oregon State builds its runs from 1 by 2 in mesh; our cheaper wall option follows that, with 1/2 in hardware cloth up to 36 in and 1x2 welded wire above it. Every route a predator can take is in the predator-proof chicken coop guide.

Run roof, door and apron

Cover the run. Penn State says to cover it with mesh wire or netting against hawks and owls, Virginia Tech says the same, NC State asks for a wire or solid roof over the whole run, and Colorado State wants a top to keep wild birds out. The example uses five corrugated polycarbonate panels, 26 in by 10 ft, on three 2x6 purlins 24 in apart, falling 1-1/2 in per foot away from the coop. That fall is the panel maker’s minimum recommended slope, and at 24 in purlin spacing Palram rates the panels for 40 pounds per square foot, above the 30 psf snow load the example is designed for. Fix them with 2 in EPDM-washered screws through pre-drilled holes on every other crown.

The run door is 30 in wide in the middle of the far end, opens out, and takes two two-step latches, one high and one low.

The anti-dig apron is where the sources spread furthest:

Our default is the surface apron NC State allows: a 24 in strip of hardware cloth screwed to the bottom rail, running 12 in up the wall and 12 in out across the ground, pinned with a landscape staple every 12 in. On the 8x8 run that takes 40 staples. Burying 12 in down with 6 in turned out is one click away in the designer.

Materials, tools and the plan

Everything above adds up to a long list. The point of a plan is that you buy it once, in store units, and cut it without waste.

What the materials list holds

For the 4x8 coop with its 8x8 run, the list counts every board by size and length (for example, twelve pressure-treated 4x4s across three lengths for the legs, beams and run posts), every sheet (one subfloor sheet, four siding sheets, two of OSB and two of 1/2 in exterior plywood for the nest boxes, dropping board, pop door and ramp), the roofing, the three mesh rolls and the hardware down to the nails per pound. We have not captured store prices yet, so the designer gives you the materials list and leaves the pricing to your store.

Tools you will use

A circular saw and a miter saw, a drill and an impact driver, a 4 ft level, a speed square for the rafter cuts, a tape, a post-hole digger for the run, tin snips or aviation snips for the hardware cloth, and a second pair of hands for raising walls and setting roof panels. Wear gloves when you cut hardware cloth: the cut ends are sharp.

From design to cut list

The 4x8 chicken coop plans page shows this design with its free summary: dimensions, the flock check and the materials list. When you are ready to cut, the builder’s plan for your exact design is $29 and carries every cut: wall framing elevations with each stud placed, a full-size rafter template, the nest box and roost details, a cutting plan for the mesh rolls, and the ten-stage build sequence with a check at the end of each stage.

Checks before the hens move in

Walk round the finished coop with this list. It is the same one that closes our builder’s plan.

Latches and gaps

Every door and the nest lid should close and latch with a two-step latch, and the pop door should slide the full travel and bolt shut. Go over every mesh edge: it should be lapped onto framing and screwed every 6 in, with no gap over 1/2 in at the doors, the corners, the ramp chute or the ground.

Cleaning access

You should reach every corner of the coop from a door, the roost bars should lift out of their cradles, and the dropping board should slide out for scraping. If any of that needs you to climb in, change it now, while the tools are out.

Paint, feed and water

Paint, stain and caulk should have cured for as long as their labels say. Set the feeder and waterer away from the roosts and the dropping board, and up off the litter. Kentucky asks you never to put roosts above food or water containers. For anything about the hens’ health, ask your vet or your county extension office.

When those checks pass, you have done the whole job of how to build a chicken coop: a house sized to the flock, closed against predators, and laid out so you can clean every corner from outside.