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01 May 25

How to paint UPVC windows

And how I saved thousands on my renovation

When we first bought our house, I knew straight away what had to go first. It wasn’t the kitchen (although that came later), it wasn’t the bathroom (that got sorted too)… it was those bright, blindingly stark plastic white UPVC windows. You know the ones… practical yes, but completely wrong for our late Victorian cottage farmhouse. There was something uncomfortable about the way they contrasted with the beautiful hand-cut clay tiles, not to mention the colour clash with the butter cream render.

We bought our house for the garden, the view, and its potential. It was not an architecturally stunning home, but it also wasn’t listed, so we knew we could knock it around to improve things. I started by getting a quote to switch the plastic for real timber or heritage aluminium, but the quote came back at £16,000 to replace them, and that was back in 2017! It was a hard ‘No’ from my then husband Tom, who, being a builder, is only too au fait with the high maintenance of wood windows that need repainting every 3-5 years. He also made a very valid point on an environmental issue. It’s fundamentally wrong to put perfectly functioning windows into landfill just because I don’t like ‘the look’, he argued. I’ve managed to persuade him around every design idea in the past, but just couldn’t get past this one. He was immovable. And annoyingly, probably right.

There had to be a solution. When the budget is tight, I always say ‘it’s time to get creative’ and honestly, it turned out to be one of the best decisions I’ve ever made.

outside of a cottage and green lawn

AFTER: The exterior of the house was re-rendered in a dark grey and all the white windows painted to match. I used Little Greene’s All Surface primer, followed by a top coat of Lamp Black acrylic eggshell.

 

english cottage

BEFORE: The bright white plastic windows looked wrong against the hand-cut clay tiles and cream render.

The simple DIY product that changed everything

So with the windows not going anywhere, I picked up a paintbrush and got stuck in. Yes, really… I painted them! And you can too. The absolute key to unlocking this marvellous revelation is using the correct product. 

The magic ingredient? An all-surface primer. That’s what helps the paint stick to the UVPC like a dream. I used Little Greene’s All Surface Primer for my exterior windows, which has the added benefit that it can be tinted to match your top coat colour. There are other Universal primers on the market, Zinsser 123 comes highly recommended, and comes in a white or dark grey colour, so again, pick which is closest to your top coat colour choice. Just double check that whichever primer you choose, it works with UVPC, as common primers are wood, metal and masonry only.

After giving the frames a really good clean with a cloth and some washing-up liquid, and making sure they were 100% dry and dust-free, I went straight in with the primer. It only took one coat as it covers really well. I then followed this up with two coats of Little Greene’s exterior acrylic eggshell. The exciting part was ofcourse choosing the colour, because the great thing about this method is you can choose anything within the colour mixing system. I chose Lamp Black, which is an almost black colour, but with a warmer grey undertone. We were also getting rid of the butter cream colour for a dark grey render, and I wanted the windows the meld away rather than pop out, because I wasn’t sure I wanted to draw attention to them. I needn’t have worried as they honestly looked so good painted. We hand-brushed them rather than sprayed the paint, as this gives it a lovely soft textured finish, which again helps trick the eye into thinking they are wood windows rather than plastic. 

outside of an english cottage and garden

It’s worth noting that painting your UPVC windows may undermine any warranties you may have. Also, painting them a very dark colour could mean the plastic will warp in the sun, as black UPVC windows have extra strengthening bars in them. However, I was happy to take the risk as these were old windows. However, 5 years on, they haven’t warped and look as good as the day I painted them.

So with the success of the makeover outside, I turned my attention to the interior…

 

blue window of a bedroom with floral wallpaper

UPVC Windows primed in  Zinsser 123  followed by Acrylic Eggshell in Southwold by Sanderson

It was almost like I was possessed. Now that I knew how easy it was to paint the UCPC windows, I needed to banish their tacky white plastic-ness from the rest of the house. I love painting woodwork and details in with my colour schemes, and in my view, the windows look more convincing if you paint them a specific colour other than an off white colour- although I have done that in the bathroom and kitchen. It’s not much of a colour change, but it means the white matches with the wallpapers I’ve chosen.

UVPC windows painted in Silver flake acrylic eggshell by Sanderson.

UVPC windows painted in Silver flake acrylic eggshell by Sanderson.

The trick is one coat of All Surface Primer and then match the top coat into your decor scheme, whether that’s matching in with the wallpaper, colour drenching or contrasting with it, you decide. This is what I love so much about this process; your windows are now part of the colour scheme.

 

black internal office window against a vibrant maximalist interior theme

Windows primed in All Surface Primer , then painted Lamp Black both by Little Greene. 

 

aubergine coloured windows and walls in a maximalist snug living room

Snug windows painted in Little Greene’s  Cordoba

Years on and still looking fabulous

More than four years later, and I’m still smiling at those windows every time I pull up outside my house. I’m seriously impressed with how well they have held up. No chips, no cracks, no bubbling. Even after soaking rain, howling storms and that almighty heatwave we all moaned about… they have stayed in top form. Just looking as good as the day I painted them. Now look, they will need painting at some point, unlike naked UVPC windows that are literally maintenance-free, I expect the paint to fail eventually. But it’ll just take a quick rub down, another lick of paint, and they’ll be good to go again. Unlike timber, that swells and contracts due to temperature, the UVPC is a much more stable substrate.

The key to success towards a heritage look is that the hand-brushed finish gives them a lovely texture that completely hides their plastic past. Friends often can’t believe they’re UPVC!

Perhaps the biggest achievement was painting the entire interior of the UVPC conservatory. Again, it was something I’d earmarked for demolition when we bought the house, but years down the line we never found the budget to do our extension, so I decided to keep it. With a handy can of paint and a lovely soft blue colour, it looks like one of those expensive garden rooms you see advertised in the weekend supplements!

 

green conservatory with fabric sails for curtains

UPVC conservatory windows painted Celestial Blue by Little Greene

The questions I get asked the most

Did you paint the handles?
Absolutely. I primed and painted them just like the frames, and they’ve held up beautifully. 

What about the white bars inside the glazing?
Honestly, you barely notice them. Unless you get right up close and squint, they completely fade into the background once the frames are a darker colour.

Any regrets?
Not a single one. Though just a heads-up… painting your windows could void the manufacturer’s warranty, so do check if that matters to you. For us, it didn’t, especially since they’ve needed absolutely no maintenance.

Would I do it again? Without a doubt

This simple trick saved us nearly twenty grand, let me be creative with colour and totally transformed the vibe of our home. It felt super satisfying to know I could change something that bugged me without spending a fortune or replacing everything. However, I’d love to paint the exterior of our UVPC conservatory, but its south-facing and I do worry that if I painted it black it could warp which could result in leaks. Now that would be expensive to replace! If anyone has any experience painting a conservatory a dark colour, please let me know.

So if you’re stuck with bright white plastic windows that leave you cold, with a lick of paint, you could save yourself a fortune and end up with something you truly love.

If you do give it a go, watch this video on my Instagram and… I’d love to see your before and afters!

yellow upvc painted window with blue and white striped blind

Window painted in Ming Gold by sanderson

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Before and after! This room took me on a real jour Before and after! This room took me on a real journey.
At first, I thought I needed a calm, blank space to focus… so I painted it all white. I know - can you believe it?! I told myself it was for clarity and creativity, but the truth is, I hated it. I felt flat and totally uninspired.

So, I ripped up the rulebook and went back to what I know works for me: bold colour and big pattern. I painted the whole space in my favourite cobalt blue (Lazuli by @zoffanyfw) and installed the ‘In the Woods’ mural from my @Harlequinfw collection - and now it’s everything I wanted and more.

I feel creative, energised, and completely connected to the beautiful garden just outside the window. A daily reminder to trust your instincts, feel from your gut and be brave. 

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A masterclass in maximalism! 🌈✨ It was such A masterclass in maximalism! 🌈✨

It was such an honour to guest judge the Interior Design Masters final alongside the fabulous @michelleogundehin and wow, what a finale it was!

The setting? The magical village of Portmeirion.
The challenge? Transform a bland holiday cottage.
The winner? The brilliant @john_cooper_design and what a winning design it was! 

John’s scheme was a glorious celebration of colour and perfect  storytelling. I loved how  he used bold Mediterranean hues and motifs from room to room which cleverly held this maximalist vision together. It felt like being whisked away to a land far far away. And thereby perfectly capturing the spirit of Portmerion. Honestly, it felt magical to be there!

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What design moment caught your eye?
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Tell me in the comments 👇

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Ready to create a home that feels unapologetically Ready to create a home that feels unapologetically YOU?

For me it’s about bold joyful colour, striking pattern, and those magical touches that light you up every time you walk through the door. This isn’t about playing it safe, it’s about crafting a home that celebrates the uniqueness of who you are and how you want to feel. 

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Thankyou @john_cooper_design for a beautiful LIVE taking a deeper look into your amazing experience being on the this most loved show. We all loved watching you grow and develop as a designer and your collection with @johnlewis is an absolute triumph! Cannot wait to see what you do next 🙌
All the Finale feels ✨ What a joy was filming t All the Finale feels ✨
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Beware of listening to the ‘experts’! I get i Beware of listening to the ‘experts’!
I get it though, designing a house is hard, especially if your taste leans towards the 
maximalist style. There is every chance you’ll feel overwhelmed or stressed about getting it wrong with the end result one hot mess. However here are some of those common ‘design rules’ that I absolutely disagree with! Would love to know your thoughts in the comments below!

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Ready to step into your best life? Start with the Ready to step into your best life? Start with the place that holds it all. Your home.

I’ve always believed that a joyful, soul-filled home isn’t just a reflection of who you are… it’s a catalyst for who you want to become. When you’re surrounded by colours that lift you, patterns that energise you, and decor that tells to your story, something magical happens.

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