How to Find the Right Mirror Size for Your Bathroom
When it comes to bathroom design, the mirror does a lot more than show your reflection. The right size can open up the space, enhance the lighting, and tie your entire design together.
It’s a small detail that makes a big impact, whether you’re working with a compact en suite or a large statement bathroom.
At Plumb Factory, we help you find a mirror that fits perfectly with your vanity, wall space, and overall layout. From sleek minimalist designs to large statement mirrors, we stock a range of luxury styles and sizes to complement every bathroom.
And if you’re unsure where to start, our expert team is always on hand to guide you through your options.
Why Mirror Size Matters in Bathroom Design
The size of your bathroom mirror has a bigger impact than you might think. A well-chosen mirror doesn’t just reflect your image, it reflects light, enhances space, and brings balance to your design. The right proportions can completely change how your bathroom feels.
In smaller bathrooms, a slightly larger mirror can make the room appear brighter and more open, while in larger spaces, an oversized mirror creates a sense of luxury and harmony. It’s all about finding the right balance between practicality and proportion.
At Plumb Factory, we help you choose a mirror size that complements your space perfectly, whether you’re going for a clean, minimal look or something more statement-making.
How to Choose the Right Mirror Size for Your Bathroom
Choosing the perfect mirror size starts with understanding your space. The mirror should work with your vanity, walls, and lighting to create balance, not fight for attention. It’s about getting the proportions right so your bathroom feels open, comfortable, and beautifully put together.
Measure Your Vanity or Basin First
Your vanity or basin is the best starting point for finding the right mirror size. As a rule, your mirror should be about the same width or slightly narrower than the vanity beneath it. This keeps everything visually aligned and helps the space feel well-proportioned.
If you have a single vanity, a single centred mirror often works best. For double vanities, you can either choose one large mirror spanning both basins or two smaller mirrors side by side, it depends on your style and how you use the space.
Ideal Bathroom Mirror Height
In most UK bathrooms, the ideal height for a mirror is with the centre positioned at eye level, so it feels natural to use for everyone. Generally, this means placing the bottom of the mirror around 5 to 10 inches above the basin.
If your family members vary in height or you’re designing a bespoke bathroom, this can be adjusted to suit your needs. The goal is always comfort and practicality, your mirror should be easy to use while enhancing the design of the room.
Ceiling Height and Wall Space Considerations
Your ceiling height and wall space play a big part in choosing mirror proportions. Taller mirrors can make a small bathroom feel bigger and draw the eye upward, creating an illusion of height.
In contrast, shorter or more compact mirrors can look perfectly balanced in low-ceiling or narrow spaces.
If your room is wide, a horizontal mirror can make the space feel even broader, while a vertical mirror works well in tight areas or next to tall fittings like wall lights or cabinets.
At Plumb Factory, we can help you visualise which layout complements your bathroom’s dimensions best.
Popular Bathroom Mirror Sizes and Styles
Mirrors come in all shapes and sizes, and the right one can completely transform the look and feel of your bathroom.
Whether you want to make a small space feel bigger, create a luxurious hotel-style setup, or add a subtle design statement, the size and style of your mirror can make all the difference.
Small Bathroom Mirrors
Small mirrors work beautifully in cloakrooms and compact bathrooms, especially when combined with clever lighting. They help bounce light around the room, making even the tightest spaces feel brighter and more open.
If you’re short on wall space, a tall narrow mirror can add height without overwhelming the room. At Plumb Factory, we can help you choose a size that feels balanced and proportionate, even in the smallest layouts.
Large Bathroom Mirrors
If you have the wall space, a large bathroom mirror instantly elevates the room. Wide mirrors above double vanities or full-length mirrors on feature walls create a sense of space and luxury that feels straight out of a high-end spa.
Large mirrors also reflect more natural and artificial light, helping the entire bathroom feel warmer and more inviting. They’re a perfect choice for open, contemporary spaces where you want to blend function with elegance.
Round and Shaped Mirrors
Round and irregular-shaped mirrors have become a huge trend in modern bathroom design, adding softness to rooms with sharp lines and angular fittings.
A big round bathroom mirror, in particular, creates a beautiful focal point above your vanity and complements minimalist, Japandi, or Scandinavian-inspired interiors.
We love how these shapes balance simplicity with style, helping you achieve a look that feels calm yet contemporary.
Bathtub Mirrors and Statement Pieces
A well-placed bathtub mirror can completely transform the mood of your bathroom. Whether you hang a large mirror behind the bath or use mirrored panels to reflect lighting, it creates depth and a sense of luxury.
When styling a bathtub mirror, think about placement and practicality. Avoid direct exposure to steam or splashes by positioning it slightly higher or to the side. Combined with soft lighting and natural textures, it turns your bath area into a true centrepiece.
Matching Mirror Size with Lighting and Fixtures
Getting the balance right between your mirror, lighting, and surrounding fixtures can completely transform how your bathroom feels. The mirror should work in harmony with your vanity unit, wall lights, and ceiling height to create symmetry and a sense of proportion.
If your mirror is too wide, it can overpower the vanity beneath it. Too narrow, and it can leave the wall space feeling empty. Ideally, the mirror aligns with or sits just inside the width of your vanity, leaving enough room for wall lights on either side if you want a more decorative, layered lighting effect.
For a sleek, modern look, integrated LED mirrors or backlit designs are a brilliant choice. They provide soft, even illumination that flatters the space and removes harsh shadows, perfect for getting ready in natural-looking light.
At Plumb Factory, we supply a range of luxury mirrors that combine beautiful design with practicality, helping you achieve a polished, cohesive finish that enhances the height, layout, and overall mood of your bathroom.
Mirror Size FAQs
What is the standard height for a bathroom mirror in the UK?
The ideal height for a bathroom mirror is usually with its centre positioned at eye level, which tends to be around 150–160cm from the floor.
As a general rule, the bottom of the mirror should sit about 5–10 inches above the basin to avoid splashes while still providing a comfortable viewing height for everyone.
How wide should a mirror be compared to a vanity?
Your mirror should typically be between 70% and 90% of the width of your vanity unit. This proportion keeps the design balanced and allows enough space for lighting or decorative features around the mirror.
Can I use a large mirror in a small bathroom?
Absolutely. A large mirror can make a compact bathroom feel brighter and more spacious by reflecting natural and artificial light. Frameless or backlit designs are particularly effective for maximising space.
What size mirror works best above a double vanity?
You can either choose one large mirror that spans the full width of both basins or two identical mirrors positioned above each sink. Both options look elegant, it just depends on whether you prefer symmetry or a continuous reflective surface.
Are round mirrors good for bathrooms?
Yes, round mirrors are a beautiful choice. They add a soft, organic shape to balance the straight lines of tiles and fixtures, making them perfect for Japandi, minimalist, or contemporary bathrooms.
What is the best mirror size for a bathtub area?
Choose a mirror that’s proportionate to the width of your bath and aligned with your tile layout. A wide horizontal mirror can enhance the sense of space, while a tall mirror above the bath creates a spa-like focal point.
Can I customise the size of my bathroom mirror?
Yes, we offer bespoke mirror options to perfectly fit your space. At Plumb Factory, we can help you choose or design a mirror that complements your layout, lighting, and overall bathroom style.