How to Make Shed Windows: A DIY Guide

If you’ve ever looked at your shed and thought, “You know what this needs? A window!” — you’re not alone. Whether you’re turning it into a cosy garden office, a haven for your DIY projects, or just trying to let in a bit more light so you don’t trip over the rake again, shed windows are a game-changer.

And the best bit? You can absolutely make and install them yourself — no need to splash out on fancy custom glass or spend hours hunting down a pre-made option that doesn’t quite fit your quirky old shed.

Let’s talk you through how to build a shed window from scratch, step by step. It’s easier than you might think — and dare I say, even a bit fun (for some people anyway!)

How to Make Shed Windows: What You’ll Need

Before we get going, here’s a quick list of materials and tools you’ll want to gather:

Materials:

Timber (for the window frame)
Perspex/acrylic sheet or real glass
Wood screws
Wood glue
Hinges (if you want it to open)
Latch or catch (optional)
Sandpaper
Paint or weatherproof wood treatment

Tools:

Saw (hand saw or circular saw)
Screwdriver or drill
Tape measure
Square
Clamps
Sander (optional but helpful)
Caulk gun & exterior sealant

Got the kettle on? Great. Let’s begin.

Step 1: Measure Your Space

First up when it comes to how to build a shed window — measure the size of your opening (or decide where you want the window to go and how big it should be).

Top tip: Keep your window on the smaller side unless you’re an experienced DIYer. A 30cm x 50cm or 40cm x 60cm size is perfect for beginners and plenty big enough to let in natural light.

Once you’ve got your measurements, jot them down — and double check them. Measure twice, cut once!

Step 2: Cut the Frame

You’re going to create a simple rectangular wooden frame that the glazing will sit in.

Cut four lengths of timber:

Two vertical pieces (the height of your window)
Two horizontal pieces (the width of your window)

Use a square to ensure your corners are… well, square. Then glue and screw the pieces together into a rectangle. Clamp it tightly while the glue sets (a couple of hours should do it).

If you want to add a bit of charm, you can mitre the corners (cut them at 45° angles), but a standard butt joint (where one piece meets the end of another) works just fine for most sheds.

Step 3: Sand and Treat the Wood

Before you fit the glazing, give your frame a good sanding. You don’t want splinters — and you do want paint or treatment to stick well.

Once smooth, apply a couple of coats of outdoor wood treatment or paint to protect the wood from the elements. Don’t skip this step — sheds have it tough out there!

Step 4: Add the Glazing

Now for the satisfying bit — adding your “glass”.

If you’re using real glass, take care when handling it. Most people opt for Perspex or acrylic sheet because:

It’s lighter
It won’t shatter
You can cut it yourself

Cut your sheet to size (slightly smaller than the inner frame so it can sit inside neatly). Then secure it in place with a bead of clear exterior sealant around the edge and small finishing nails or glazing clips if you fancy.

Press the sheet down firmly and leave the sealant to cure.

Optional: If you want a more traditional look, you can add thin wooden glazing bars across the window to make it look like it’s made from multiple panes. Cute!

Step 5: Add Hinges (Optional)

Fancy a bit of fresh air? You can make your window open by attaching one side of the frame to your shed wall with hinges.

Choose either top-hinged (like a flap) or side-hinged depending on what suits your shed.

You’ll also need:

A small chain or stay to stop the window flapping all the way open
A latch to keep it closed

Keep in mind: An opening window will need to be fully sealed when shut or you’ll let in water and bugs. If you don’t need it to open, it’s often simpler (and more weatherproof) to keep it fixed.

Step 6: Install Your New Window!

Time to pop it in. If you’re retrofitting your window into an existing wall, you’ll need to cut an opening first — carefully! You may want to reinforce the surrounding frame with extra timber depending on your shed’s structure.

Once ready, slide your frame into place and screw it securely to the shed wall from the inside.

Seal all the edges with exterior caulk or sealant to keep water out. You can then neaten it up from the outside with trim or beading for a more finished look.

Tip for How to build a shed window: Reclaimed Materials Are Your Friend

If you’re into upcycling or just want to keep costs down, old picture frames or windows from Facebook Marketplace or your local tip shop can make amazing shed windows.

Just make sure they’re in good condition, and don’t forget to seal and paint them so they last in outdoor conditions.

Once your window is in, treat yourself. Add a little curtain if you’re turning your shed into a garden retreat, or leave it plain for a rustic, practical look.

If you’ve gone all out, a flower box beneath the window or a little lantern hanging nearby adds that “garden magazine” charm we all secretly want.

FAQs: How to build a shed window

1. What’s the best type of glass for a shed window?

Acrylic (Perspex) is ideal for DIY shed windows. It’s strong, lightweight, and easy to work with. If you’re after real glass, toughened glass is safest but harder to cut at home.

2. Can I make shed windows open?

Yes! Add hinges and a latch for a functional window. Just be sure to seal the edges properly to keep the weather out.

3. How do I stop my shed window from leaking?

Use high-quality exterior sealant or caulk around the frame. Make sure your window frame is treated and sits snugly in the shed wall.

4. Is it cheaper to make your own window or buy one?

Usually cheaper to make it, especially if you already have basic tools. You can also customise the size and style to suit your shed.

5. Do I need planning permission to add a window to my shed?

In most cases, no — especially if it’s a small shed in your own garden. But if you live in a listed building or conservation area, it’s always best to check with your local authority.

There’s something deeply satisfying about making your own shed window. It’s a small project with a big impact — more light, more charm, and more functionality for your little outbuilding.

Whether you’re a seasoned DIYer or just getting started, this is the kind of project that builds confidence. And the next time someone visits your garden and compliments your shed, you can say, “Thanks, I made the windows myself!” (You’ve earned that smug cup of tea.)

Happy shed-tinkering — and don’t forget to send me a photo if you give it a go!