DIY Golf Simulator Enclosure: Frame and Materials Plan

A DIY golf simulator enclosure is a frame that holds the impact screen, catches stray balls and gives the projector and cladding something solid to sit on. Most of the decisions that matter happen before you buy anything: which framing system you use, how big the box needs to be for your room, and what the walls are made of. Get those right and the rest of the build is mostly careful measuring and patient fixing.

This page covers the enclosure structure itself. It compares the framing systems, works a complete cut list for one realistic box, walks through assembly and then covers the cladding, shopping and services you need before you close the space in. It does not try to be the whole bay guide. Launch monitor setup, projector choice and software live elsewhere, as explained below.

How we put this together: we compared published manufacturer specs, retailer listings and owner reports. Links on this page may earn us a commission.

What this guide covers and where our other build pages take over

This page is about designing and building the enclosure: the framing system, the materials that clad it, and the electrical and airflow services you rough in while the walls are still open. It stops short of the rest of the bay. For the launch monitor, projector, software and commissioning, read the full home simulator build. For projector mounts specifically, see projector mounts.

If your frame loosens, sags or leaves gaps, the fix is usually in the joints or the tension, and those problems are covered in enclosure mistakes to avoid. Keep that page open while you build, because the squareness and tolerance advice there pairs with the diagonal checks below. For the screen itself, see building your own impact screen.

We have not built this enclosure ourselves. The dimensions, arithmetic and building practice in this guide come from published specs, common construction methods and calculations you can repeat with a tape measure and a calculator.

Kit, hybrid or scratch build: choose your route first

Before you buy any material, decide how much of the enclosure you want to build yourself. There are three routes, and they differ more in time and tooling than in the finished result.

Route	What you buy	Skill and tools	Adjustability	Who it suits
Complete enclosure kit	Frame, screen, side netting and padding sold together	Basic assembly with a driver and a level	Limited to the sizes the kit is made in	Buyers who want the least work and a frame sized to fit a known space
Hybrid	Kit corner fittings, with the pipe sourced locally	Cutting pipe, fitting it together, basic hand tools	Good, since you set the lengths when you cut the pipe	Builders who want engineered fittings but prefer to buy pipe locally
Scratch build	Timber, aluminium extrusion or welded steel, cut to your room	Saw and drill for timber, extrusion kit tools, or welding skills for steel	Depends on the material, and timber is the hardest to change later	Builders with the tools and time who want an exact fit

A complete kit is the least work because the frame, screen, netting and padding are designed to match. You pay for that convenience and accept the sizes on offer. If you want to see what that looks like before deciding, all-in-one enclosure kits and ready-made enclosures and screens cover the ready-made options side by side.

The hybrid route sits in the middle. Carl's Place sells steel enclosure fittings designed for EMT conduit, with the pipe not included. Check the current kit contents and the pipe size the fittings need before you order, because a fitting that suits one diameter will not seat on another. You cut and join the conduit yourself, which gives you control over length without welding.

A scratch build is the most flexible and the most work. You choose the material, the frame size and the joinery, and you can plan for a future change such as a bigger screen. The cost of a scratch build depends on local material prices and on how many of the tools you already own. Those two factors move the total far more than any rule of thumb, so price your own list rather than trusting a headline percentage.

Compare ready-made enclosures

Sizing the box from the room inward

Start with the room, not the frame. Measure the width, depth and ceiling height at several points, because walls are rarely perfectly parallel and ceilings can dip near ducts or beams. Use the smallest figure you find. The enclosure has to fit inside that smallest opening with room to spare, so a generous measurement on paper can turn into a tight squeeze in practice.

For width, about 10 ft is a common minimum for a centred right-handed setup. About 12 ft gives a comfortable margin, and about 15 ft lets left and right-handed players both hit from a centred spot. Check these figures against the launch monitor you plan to use, since some units ask for more room than others. You can read more about floor area in golf simulator room size.

Height is set by the swing and by the golfer. Nine feet is a common minimum for full swings. If players are over about 6 ft tall, plan for 10 ft. Remember that the frame's height is not the only figure that matters: the ceiling must also clear the top rails, any ceiling baffle and whatever you hang from the top. The full ceiling needs are covered in ceiling height needs.

Depth is the figure most people underestimate. The enclosure is only part of it. The room also needs the ball-to-screen distance, which is commonly quoted as 8 to 12 ft, plus space behind the golfer for the swing and for any radar unit placed behind the hitting area. Work out the total room depth first, then decide how much of it the enclosure takes up. The distance question is covered in ball to screen distance.

Leave a gap between the impact screen and the back wall or backstop. A gap of about 12 to 18 in lets the screen flex when balls hit it without the ball striking the wall behind. If you are building against an existing wall, that gap is the first thing to plan around. The gap between screen and wall has more on why it matters.

Finally, remember that the outside dimensions of the frame are not the same as the inside opening. The inside opening is the screen and net size. The outside dimensions are that opening plus the thickness of the frame members on each side. A 2x4 is about 1.5 x 3.5 in actual size even though it is sold as a 2x4, and a conduit or extrusion member adds its own thickness. Account for that width when you order a screen, or the screen will not fit the opening you built.

Five framing systems compared

Five framing systems cover almost every home build. They trade stiffness, tooling, adjustability and cost in different ways, and the right one depends on whether the enclosure is a fixed room feature or something you might take apart later.

System	Stiffness	Tools needed	Can it be adjusted later	Relative cost	Best for
EMT steel conduit with bolt-on fittings	Stiff and light	Hacksaw or pipe cutter, plus a wrench	Easy to reconfigure	Low to moderate	Freestanding boxes
Timber (2x4 or 2x6 studs)	Stiff when braced	Saw, and a drill or impact driver	Hard to change once built	Low	Room-built enclosures and walls
Aluminium extrusion (T-slot, such as 80/20 style)	Very stiff and modular	Precise cutting, plus many fasteners	Highly adjustable	Higher	A clean look and future changes
Welded steel tube or C-channel	Strongest	Welding skills, and paint against corrosion	Not adjustable	Varies widely	Permanent installs
PVC pipe	Light, and flexes under repeated impacts	Saw and fittings	Depends on the joints you choose	Low	Light-duty or temporary frames

PVC is the cheapest and lightest, but it flexes under repeated impacts, so it only suits light-duty or temporary frames. If you already have PVC and want to stiffen it, the enclosure mistakes page covers the bracing approaches that help.

Conduit frames for renters and reconfigurers

EMT conduit is sold in 10 ft lengths at most home stores, though you should confirm the lengths available locally before you plan around them. You cut each length to size, join the pieces with fittings and can take the whole frame apart when you move. Kit fittings remove the need for welding or drilling into walls, which matters if you rent or if you may need the room back later.

Conduit is stiff enough for a freestanding box but flexes more than timber if you join it loosely, so every joint needs to be fully tightened and the diagonals checked. Its main appeal is that the frame is easy to reconfigure, and the fittings are the part of the build that most often decides how sturdy the result feels.

Timber frames for permanent rooms

A timber enclosure is built like a stud wall: a bottom plate, the studs and a top plate. You can clad it directly with plywood or drywall, which makes it a strong choice for a room you plan to keep. Timber is cheap, widely available and easy to work with using basic tools, but it is hard to change once the cladding is on.

Use pressure-treated timber for the bottom plate wherever it sits on concrete or in a damp floor. Untreated wood left in contact with moisture rots, and a rotting bottom plate is a slow failure that is hard to see until the frame starts to move.

Aluminium and steel for the long haul

Aluminium extrusion is the most adjustable option. You can slide brackets along the T-slots to move the screen, or add a ceiling baffle later without cutting anything. The cost is higher, and precise cuts and many fasteners are part of the job.

Welded steel is the strongest option and suits builders who already weld. It is not adjustable, so decide the layout before you start. Paint or powder-coat the steel to protect it against corrosion, and do the finishing before the frame goes into the room so the coating reaches every joint.

Worked cut list: a 12 x 9 x 10 ft freestanding box

This is an illustrative example in EMT conduit. Use it as a template for your own room, and swap in your numbers. The box is 12 ft wide, 9 ft tall and 10 ft deep. Every figure below is simple multiplication and addition, so you can repeat it for any size.

The members, before options

Four corner posts at 9 ft each: 4 x 9 = 36 ft.
Two top rails across the width at 12 ft each: 2 x 12 = 24 ft.
Two top rails along the depth at 10 ft each: 2 x 10 = 20 ft.
Basic box total: 36 + 24 + 20 = 80 ft.

The optional members

Mid ceiling rail across the width, to carry a baffle: 12 ft.
Bottom rail across the front of the screen frame: 12 ft.
Side return bottom rails: 2 x 10 = 20 ft.
Options total: 12 + 12 + 20 = 44 ft, so the box with every option comes to 80 + 44 = 124 ft.

Turning that into 10 ft sticks

Each 9 ft post is cut from a 10 ft stick, leaving a 1 ft offcut that is too short to reuse. Four posts use four sticks.
The two depth rails are exactly 10 ft, so each takes one stick.
Each 12 ft width rail is a 10 ft piece plus a 2 ft piece joined with a coupler. Two 10 ft pieces come from two sticks, and the two 2 ft pieces come from a ninth stick, which leaves 6 ft over.
The basic box therefore uses 4 + 2 + 2 = 9 sticks, or 90 ft of conduit to build 80 ft of frame. The waste is four 1 ft offcuts plus the 6 ft leftover, which is 10 ft in total.
The mid ceiling rail takes one stick plus a 2 ft piece from the leftover, leaving 4 ft.
The front bottom rail takes one stick plus a 2 ft piece, leaving 2 ft.
The side bottom rails take two sticks.
With all options, the total is 9 + 1 + 1 + 2 = 13 sticks, which is 130 ft bought for 124 ft used. Buy one or two spare sticks for cutting mistakes, since a wrong cut on a 12 ft run is expensive to fix.

Couplers and fittings

Each 12 ft run needs one coupler, and there are four such runs once you add the options: the two top width rails, the mid ceiling rail and the front bottom rail. The basic box needs two couplers, and the full build needs up to four. A closed box with bottom rails uses 8 three-way corner fittings, four on the top and four on the bottom. Without bottom rails you need only four corners, and you use foot plates to stand the posts instead.

The squareness check

A rectangle is only square when its diagonals match, and you can check that with the Pythagorean theorem before anything is fixed in place. On the 12 x 9 ft front face, the diagonal is the square root of (12 squared plus 9 squared), which is the square root of (144 + 81) = the square root of 225 = 15 ft exactly. On the 12 x 10 ft roof, the diagonal is the square root of (144 + 100) = the square root of 244, or about 15 ft 7.5 in.

Measure both diagonals of every face and adjust until each pair matches. A small difference that you cannot close usually means a member is the wrong length or a joint has not seated fully. How much mismatch is acceptable and how to correct it is covered in enclosure mistakes to avoid.

Putting the structure together

Assembly goes faster when every member is cut and labelled before you touch the frame. Mark each piece with its position, such as "front top, left" or "rear post, right", so you are never guessing which piece belongs where halfway through a joint.

Cut all members to length and label them. Dry-fit the posts and rails so you can see any cutting mistake before the fittings are tightened.
Lay out the base rectangle on the floor. Use painter's tape to mark the footprint if the floor is finished or you want to keep the layout visible while you work.
Stand the corner posts and fix them to the base or to the foot plates.
Add the top rails, then any mid rails or cross members that give the box its rigidity.
Measure both diagonals of each face and adjust until they match, then tighten every joint fully. Do not tighten one corner completely before the rest are square, because a fully locked corner will not move when you correct the others.
Check every post with a level on two faces. A post that is plumb on one face and out on the other usually means the base is not level, so fix the base before you adjust the post.
Add ceiling rails or rafters if the box has a roof, and add gussets or corner brackets at the joints that carry the most load. For timber builds, fix plywood kick plates low on the sides so the lower rails are protected from stray shots.
Only then hang the screen, nets and padding. Hanging the screen on an unsquare frame bakes the error into the image, and it is much harder to correct once the screen is taut.

Avoid common enclosure mistakes

Cladding the frame: walls, ceiling and floor

Cladding does three jobs: it stops balls, it takes impacts without damage and it affects how the room sounds. No single material does all three well, so most builds layer a few together, with each material placed where its strengths matter.

Material	Stops balls	Sound	Finish	Notes
Ballistic or sports netting	Contains balls	Does little for sound	Open mesh that shows the frame	Keeps the space open-looking
Blackout drape or baffle fabric	Softens stray shots when backed by netting	Softens the room	Matte fabric	Hides the frame and darkens the room for projection
Plywood (CDX, or face veneers such as birch or bamboo)	Takes impacts well	Not a sound product on its own	Paintable, and nicer faces look better	Pair with foam padding in the strike zone
Drywall (moisture and mould-resistant boards for damp spaces)	Little impact protection	Smooth and hard	Smooth, paintable	Dents easily, so pad it or keep it out of the ball's path
Artificial turf on walls	Absorbs impact	Reduces bounce and some noise	Textured	Works well as a lower-wall or floor-level finish
HDPE panels, rubber sheet or metal sheet	Durable in high-wear zones	Not a stated strength	Utilitarian	Good for the spots that take the most hits
Mass-loaded vinyl	Not its job	Added to walls for sound reduction	Usually hidden behind a finish	Adds weight, so check the wall can carry it

Check your local fire codes for interior finishes, especially foam and fabric. Fire rating is a property of the specific product, so read the label or data sheet rather than assuming a material is safe because it is common.

Side walls and the strike zone

Most stray shots hit low on the sides, close to the screen. That zone needs the toughest surface or the thickest padding, so put your hardest cladding and your heaviest padding there first. Foam of about 2 in is often quoted for this area, but check it against your own setup before you buy, since the right thickness depends on how the screen and net sit.

Side netting with about 1 in mesh is a common choice for the open sides of the box. Confirm the mesh size with the supplier, because finer mesh is quieter but costs more, and coarser mesh lets smaller balls through. If noise is a concern, keeping the noise down and wall padding options compare the trade-offs in more detail.

Ceiling baffle

A fabric or netting baffle across the top of the box stops skied shots from hitting lights or the ceiling. It also hides the area where the projector mount sits, which keeps the room tidier. Mount the baffle on the mid ceiling rail from the cut list so the fixings are inside the frame rather than hanging from the screen.

Floor under the hitting area

Wood or composite decking, or a subfloor over concrete, levels the hitting area and gives you a solid base. On top of that you can lay rubber sports flooring or turf, and the hitting mat sits on this surface. A level floor matters more than most people expect, because a tilted hitting area changes the angle of every shot and can throw off the launch monitor's readings. Flooring choices are compared in flooring under the hitting area.

Hardware and consumables shopping list

Take this list to the store so you buy the right fasteners and tools the first time.

Fittings or brackets for your chosen framing system
Galvanised lag bolts or structural screws for timber, not drywall screws
Bungee cords or ball bungees, zip ties and carabiners for screen and net attachment
Foam padding and pole padding for exposed posts
Thread-locker for threaded connections
Tools: laser measure, long level, carpenter's square, pipe cutter or saw, impact driver and a deburring tool
Painter's tape for marking the footprint

Entry points and doors

A freestanding box usually stays open at the golfer's end, which is the most practical choice for access and airflow. Overlap the side netting at that opening so balls cannot escape past the edge. Overlapping is cheap and it is the difference between a box that catches shots and one that loses balls around the back.

A room-built enclosure with a door needs more planning. About 36 in wide by 80 in high is a common minimum for a door you walk through with equipment. An outward-opening door gives you more room inside the enclosure and makes exit easier, because you are not standing in the swing space to pull it shut. Lever handles are also easier to use with clubs in your hands than round knobs.

Keep the door out of the swing arc and out of the ball's path. A door that swings into the hitting area can be struck, and a door panel that a ball hits can damage the hinges or the lock.

Power, cabling and airflow before you close it in

Rough in your services while the walls and floor are still open. Changing a cable run after the cladding is on is far more work than running it correctly the first time.

Plan outlets for the projector, computer, launch monitor charger and lighting. A dedicated circuit is often recommended for AV gear, so verify this with an electrician before you assume a shared circuit will do.
Use surge protection on every powered item. A UPS protects the computer from brief outages and gives it time to shut down cleanly.
Run HDMI and power to the projector position through conduit or cable raceway, and keep cables off the floor in the hitting area so no one trips on them or catches a club.
Install GFCI protection where local code requires it. Any new circuit or permanent wiring should be done to code, and by a licensed electrician where local rules require one.
Place lighting behind or beside the golfer rather than between the projector and the screen, so you avoid shadows and glare on the image. The lighting placement guide explains why this matters for the sensors.
Plan airflow. An enclosed room with a projector and computer gets warm, so add an exhaust fan and an intake vent, or plan for air conditioning with a mini-split or portable unit. If the space is a garage or shed, add insulation too.

Recessed LED lighting is a common choice for the ceiling because it stays out of the image and out of the swing path. Put any switches and outlets where the golfer can reach them without stepping into the hitting area.

Permits, codes and fire safety

A freestanding, removable frame inside a room is usually treated differently from permanent construction. New walls, electrical circuits and structural changes may need permits, and rules differ by location. Check with the local building department before you start, and ask them specifically about the wiring and any wall you plan to build or change.

If a permit applies, plan for an inspection before the walls are closed. Inspectors need to see the framing and the wiring, and covering them first can mean opening everything back up.

Fit smoke and carbon monoxide detectors in the room, and keep an ABC fire extinguisher near the exit. Choose fire-rated fabrics and foams where they are available, and keep heat sources such as projectors clear of fabric so a hot lamp housing never sits against a drape. Finally, make sure the exit stays clear and opens easily. A door or path blocked by equipment is a hazard in an emergency, so keep it clear at all times.

Budget template by frame type

Price your build from a line-item template rather than a single total, since the cost moves in different places depending on the frame you choose. The table shows where each line changes most.

Line item	Where the cost moves most by frame system
Frame members	Conduit lengths, timber sticks, aluminium extrusion or steel tube
Fittings or brackets	Conduit fittings, or extrusion connectors for aluminium
Fasteners	Lag bolts and structural screws, plus plywood sheet goods, for timber
Screen	Set by the frame opening, so it is much the same whatever the frame
Side netting	Largely the same whatever the frame
Baffle	Largely the same whatever the frame
Padding	Largely the same whatever the frame
Floor	Decking or subfloor over concrete, with rubber sports flooring or turf on top
Electrical	Largely the same whatever the frame
Lighting	Largely the same whatever the frame
Ventilation	Depends on the room, such as a garage or basement
Finishing	Paint or powder-coat for steel, and welding consumables for steel builds

Price each line from local suppliers, because material costs vary a great deal from one region to another. Then compare your total against a full kit price on the enclosures and impact screens page. If your budget is tight, the low-cost DIY build shows where people usually find savings and where they regret cutting corners.

The savings from building your own enclosure depend on your local material prices and on the tools you already own. Do not assume a fixed saving before you have priced the whole list, because a few specialist tools can cancel out a lot of material savings on a first build.

Questions builders ask before the first cut

Can I build the enclosure against an existing wall instead of freestanding?

Yes. The back wall can carry the screen frame, which saves material. Keep 12 to 18 in between the screen and the wall so the screen can flex, and pad or protect the wall behind it. Check your structure before fixing anything, and fix into studs or masonry with suitable anchors, using a qualified pro where needed.

Should the projector hang from the enclosure frame or the room ceiling?

The room ceiling or joists are usually steadier. A light frame can vibrate when balls hit the screen, and that shake shows up in the image. If you mount to the frame, use a stiff cross member and a solid mount. Check your structure before you hang anything, and use a qualified pro where needed.

Can a DIY enclosure come with me when I move?

Conduit with bolt-on fittings and aluminium extrusion come apart easily, so they are the easiest to take with you when you move. Label every part before you take the frame down, because matching parts later is slow work. Timber and welded steel builds are harder to move and often stay with the house.

Do I need a permit for a freestanding frame?

Often not for a removable frame inside an existing room, but new walls, wiring or structural changes can need one. Rules vary by location, so check with the local building department before you start. If a permit applies, plan for an inspection before any walls are closed.

What screen size should I order for a custom frame?

Measure the frame's inside opening after it is built, then subtract the gap your attachment method needs, such as bungees or ball bungees. Match the projector's aspect ratio, 16

or 4

, to the image you plan to project. Order from the finished frame rather than the plan, because small build errors add up.

Building a Simulator Enclosure From Scratch: Frame Choices, Cut List and Wall Skins