Rectangular & arched bathroom mirrors

Rectangular is the safe choice, the boring choice, the choice you make when you don't want to make a choice. None of that is true.

Rectangular bathroom mirrors maximise reflective area, suit more vanity widths than any other shape, work in essentially every bathroom style from period Victorian to ultra-modern, and form the backbone of British bathroom design for good reason.

The arched variant (a rectangular mirror with a curved top edge) takes the same fundamental shape and adds architectural character without sacrificing reflection area. This page is about the rectangular family in detail: portrait or landscape orientation, the arched alternative, the finishes and large sizing that make the shape work hardest.

Portrait or landscape?

Rectangular mirrors come in two orientations, and the choice is driven by the vanity below and the wall above:

• Portrait (taller than wide). Suits single basins, narrower vanities (under 700mm), and walls with limited horizontal space. Reflects more of the user's full body, useful for grooming. The default for cloakrooms and single-basin ensuites.
• Landscape (wider than tall). Suits double-basin vanities, wider vanities (800mm+), and walls with horizontal space to spare. Reflects more of the room behind the user, makes a bathroom feel wider. The default for larger family bathrooms and master bathrooms.

The proportion rule applies to both orientations: mirror width at 70–80% of vanity width. Portrait mirrors above narrower vanities; landscape mirrors above wider vanities; the orientation isn't a free choice independent of the vanity. Going landscape above a narrow vanity makes the mirror look stretched; going portrait above a wide vanity leaves awkward empty wall space either side.

For the full proportional sizing logic, see the bathroom mirror sizes & shapes guide.

The arched mirror trend

An arched mirror is a rectangular mirror with the top edge replaced by a curve (typically a semicircle or shallow arch). The bottom and sides remain straight; only the top is curved. The visual effect: the mirror keeps the reflective area and proportion of a standard rectangle but adds architectural character at the top, the kind of detail you'd find above a window or doorway in Georgian or Victorian architecture, transposed to a bathroom mirror.

The arched mirror became popular in UK bathroom design from around 2020, driven by the broader return of curved and softened shapes after decades of straight-line minimalism.

Unlike the round mirror trend (which replaced rectangular entirely with a different shape), the arched trend kept the rectangular foundation and added the curve only where it adds visual interest without sacrificing function. That makes arched the lower-risk shape decision than fully round: you get the modern soft-shape register without losing the reflective area that grooming and daily use depend on.

Arched mirrors come in the same orientations as standard rectangular (typically portrait, occasionally landscape with the arch on one short side rather than the top), the same finishes (black, brass, chrome, frameless), and the same feature options (LED, demister, backlit).

The decision to choose arched over standard rectangular is purely aesthetic: do you want the character of the curved top, or the cleaner geometry of the straight top?

Finishes and large sizes

Rectangular and arched mirrors come in every finish the broader category offers:

• Black framed rectangular and arched. The current modern default. Slim matte black frame in either rectangular or arched form. The arched in black reads as especially deliberate: the modern arch shape in the modern black finish.
• Frameless rectangular. Polished mirror edge with no frame. Suits minimalist contemporary bathrooms where the mirror should recede visually. Less common in arched (the curved top usually benefits from a frame to define the shape).
• Brass and chrome framed. Traditional metal framing options. Chrome works for any modern bathroom; brass works for warmer-toned and period schemes.

Rectangular mirrors scale up effectively in a way some other shapes don't. Large rectangular mirrors (800–1200mm wide) read as substantial and grounded in master bathrooms and statement spaces; the same scale in round can read as oversized. For large mirror specifications, rectangular is the default; for genuinely huge feature mirrors (1200mm+), rectangular is essentially the only sensible choice.

Browse large bathroom mirrors for the 800mm+ range, black framed bathroom mirrors for the matte black finish, or frameless & bevelled mirrors for the frameless options.

Rectangular & arched FAQs

Isn't rectangular boring compared to round or arched?

Not in the right context. Round and arched are visually distinctive, but distinctiveness isn't always what a bathroom needs. For master bathrooms and family bathrooms where the mirror is worked at, rectangular maximises reflection and serves daily use better than the distinctive alternatives. Many designer bathrooms specify rectangular for the unfussy functional confidence the shape brings; rectangular isn't 'boring', it's 'unfussy'.

Won't an arched mirror date faster than a standard rectangular?

The arch shape has been part of UK architectural vocabulary for several centuries (Georgian, Victorian, Art Deco arches), so the shape language isn't novel. What is recent is its application to bathroom mirrors specifically (from around 2020). The shape's broader architectural heritage suggests revival rather than trend; properly chosen arched mirrors should age similarly to other classic architectural references. That said, standard rectangular has the longer pure-bathroom track record and is the safer call for risk-averse buyers.

Should I get portrait or landscape for my new bathroom build?

Depends on the vanity choice you're making in parallel. Single-basin vanities under 700mm wide want portrait mirrors; double-basin or wider vanities (800mm+) want landscape. Don't decide the mirror orientation independently of the vanity decision; they have to be made together. If you're early in the renovation and the vanity isn't yet chosen, hold the mirror decision until the vanity is settled.

My builder said arched mirrors need a custom-cut wall fixing. Is that true?

No, arched mirrors use the same mounting methods as standard rectangular: wall brackets or concealed fixings on the back of the frame. The curved top doesn't affect the fixing because fixings are usually on the back panel rather than the visible front. Any installer experienced with standard mirror fitting can handle arched without special equipment. If your builder is claiming otherwise, get a second quote.

I'm renovating a Georgian-era house. Does an arched mirror suit?

Yes, possibly better than standard rectangular. The arched shape has direct Georgian precedent (doorways and windows commonly featured arched tops), so an arched mirror in a Georgian-era bathroom reads as architecturally appropriate rather than out of place. Pair with brass or polished chrome framing (period-appropriate metalwork) rather than matte black. Standard rectangular also works, but arched arguably honours the period better.

Filter the grid above by orientation, arched/standard, finish, size and LED option. For the wider shape decision context, see the bathroom mirrors hub or the complete bathroom mirrors buying guide.

Plumbworld has supplied UK rectangular and arched bathroom mirrors since 1999, with a 4.8/5 rating from over 60,000 Trustpilot reviews, free UK delivery, a price match promise, and 365-day returns. The classic shape in the right orientation is a low-risk choice to commit to.

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