What is the difference between casement and flush casement windows?
Choosing new windows is a big decision, and the right style can make a real difference to your home’s comfort, security and kerb appeal. For many Leeds homeowners, it often comes down to two of the most popular options: casement windows and flush casement (or flush sash) windows. But what’s the difference between casement and flush windows, and which is the best fit for your property?
With over 40 years’ experience working across all types of homes in Leeds and West Yorkshire, we’ve helped countless customers find the right windows. In this guide, we’ll explain casement vs flush windows, highlight the pros and cons of each and share some honest advice to help you make a confident choice.
If you’re thinking about new or replacement windows, you can see our full range on our windows page.
What are casement windows?
Casement windows are a classic choice for homes across Leeds and Yorkshire, and there’s a good reason they’ve stood the test of time. A traditional window style, casement windows are usually hinged at the side (although you can get top-hung versions too) and open outwards to let in plenty of fresh air. You’ll see them on everything from traditional terraces to new builds.
At Leeds Glass, our casement windows come in a wide range of colours and finishes to suit any home. We can help you find a style that works for your property.
Why choose casement windows?
- • Easy to keep clean with very little looking after needed
- • Cost-effective and hardwearing
- • Available in double or triple glazing for warmth and efficiency
- • Versatile design – fits in with most home styles
- • Available with a BSI energy efficiency rating A
Flush casement windows explained
Flush casement windows (also known as flush sash windows) bring together the best of both worlds: classic, period looks with modern performance. The difference is all in the profile – when closed, the sash (the moving part of the window) sits completely level with the frame, so you get a sleek, smooth finish on the outside.
Our flush sash windows are designed to replicate traditional 19th-century timber windows, making them one of the best window types for period properties. They’re ideal for cottages or homes in conservation areas, and because they’re made from modern, virtually maintenance-free uPVC, you get all the benefits of a new window too.
Why choose flush casement windows?
- • Perfect for period homes or an understated look
- • Authentic appearance that keeps your home’s character
- • Suitable for use in conservation areas
- • Hardwearing and easy to look after
- • Available in a range of colours and finishes
- • Energy efficient with rating A options available
Key differences between casement and flush casement windows
If you’re comparing casement vs flush windows, here’s a quick side-by-side look at how they stack up.
| Feature | Casement windows | Flush casement (flush sash) windows |
|---|---|---|
| Sash position | Sash sits slightly proud of the frame (“lipped”) | Sash sits level/flush with the frame |
| Appearance | Traditional, classic profile | Smooth, flat and understated look |
| Best for | All property types | Period homes, cottages, conservation areas |
| Maintenance | Low, easy to clean uPVC | Low, easy to clean uPVC |
| Energy efficiency | A-rated options available | A-rated options available |
| Cost | Generally more affordable | Higher due to the premium design |
| Common uses | Most homes, new and old | Traditional homes, heritage settings |
Appearance and aesthetic considerations
For many homeowners, looks are just as important as performance. Casement windows give you a more traditional “lipped” look, where the sash slightly overlaps the frame. It’s a style that works well on just about any house, making it a solid option for those weighing up traditional vs modern window styles.
Flush casement windows, by contrast, give you a much flatter finish. This is often the go-to choice if you want to stay true to your home’s original style (especially in Victorian or Edwardian terraces) or if your property is in a conservation area. If you’re after a subtle, elegant exterior, flush windows could be just the thing.
Not sure which would suit your house? Our team is always happy to advise based on your property’s age, style and the local area.
Energy efficiency: casement vs flush windows
Yorkshire winters can be chilly, so energy efficiency is always high on the list. Both our casement and flush casement windows are available with a BSI window energy efficiency rating A, helping you keep the warmth in and the bills down.
- • Casement windows: Modern uPVC frames with double or triple glazing mean impressive insulation and fewer draughts.
- • Flush casement windows: Despite their period looks, you don’t have to compromise on performance – these offer the same A-rated energy efficiency as standard casements.
Security features
Your windows are one of your home’s first lines of defence. Both styles from Leeds Glass come with strong, secure uPVC frames and modern locking systems as standard. Our professional installers will make sure everything is fitted safely and meets national standards, so you can feel confident your home is protected.
If you’d like to find out more about what makes a window or door secure, take a look at our blog on window and door security for practical tips and advice.
Cost considerations
When it comes to price, it’s helpful to look at a cost comparison for casement and flush windows. In general, standard casement windows are the more affordable option and give you plenty of style choices for your money. Flush casement windows tend to cost a bit more, due to the extra work involved in achieving the premium, flush finish.
If you’re working to a budget, casements are a solid choice. If you’re restoring a period property or want your windows to blend in with original features, flush casements are often worth the extra investment.
Which window style is right for your home?
Every home is different, and so are our customers’ priorities. If you live in a period property, in a conservation area or you just love that smooth, heritage style, flush casement windows might be the way to go. For most other homes, standard casement windows offer a reliable, great-looking and cost-effective solution.
If you’re not sure what’s best, our team can talk you through the pros and cons, show you some examples and help you find the perfect match for your needs.
Installation and maintenance tips
No matter which style you choose, you’ll get hardwearing, low-maintenance windows that are built to last. Just give the frames a quick wipe with soapy water from time to time, keep the tracks free of debris and check the locks and hinges occasionally to make sure everything’s working as it should. If you ever need advice, you can always give us a call – we’re here to help, even after your windows are installed.
Frequently asked questions
What’s the main difference between casement and flush casement windows?
Casement windows have a “lipped” design, where the sash overlaps the frame. Flush casement windows (flush sashes) sit level with the frame for a flatter, more subtle look.
Which is better, casement or flush casement windows?
It depends on your home and preferences. Casement windows are versatile and great value, while flush casements are perfect for period properties or anyone wanting a sleek exterior.
Are flush casement windows more expensive?
Yes, flush casement windows usually cost more due to their premium design and the extra work involved in creating that authentic, flush finish.
Are both energy-efficient?
Yes, both types are available with an A-rated energy efficiency, so you don’t need to compromise on warmth or comfort.
Can I have flush casement windows in a modern home?
Absolutely. While they’re designed to replicate period windows, flush casements can give a smart, contemporary finish to any style of property.
Do I need special permission for flush casements in a conservation area?
Flush casement windows are often preferred in conservation areas because they match original timber styles, but it’s always worth checking with your local planning authority.
Ready to take the next step?
If you’re thinking about new windows, we’re here to help. Our friendly team can offer straightforward advice, talk you through the options and arrange a home survey if you’d like. You’re welcome to drop by our Leeds showroom to see the styles in person, or you can request a quote online and we’ll help you find the best fit for your home.
No matter what type of property you have, we’ll help you find the right windows for your needs and budget. Get in touch today and let’s see how we can help.