Complete Guide to Buying Internal Doors

Choosing the right internal doors for your home is an important decision that affects both the look and functionality of your living space. This comprehensive guide covers everything you need to know about selecting, measuring, and buying internal doors in the UK.

What Size Internal Door Do I Need?

UK internal doors come in standard sizes. Most homes built after the 1930s use these common dimensions:

Door Type	Width	Height
Standard Internal	762mm (30")	1981mm (78")
Metric Standard	726mm	2040mm
Large Internal	838mm (33")	1981mm (78")

How to Measure Your Door Opening

Accurate measurement is crucial for a perfect fit. Follow these steps:

• Measure the width at the top, middle, and bottom of the opening
• Measure the height on both sides and in the centre
• Use the smallest measurements to ensure your door fits
• Allow for clearance — typically 2-3mm on each side

Need help measuring? Check our detailed measuring guide.

Pre-Hung vs Slab Doors: Which Should You Choose?

Slab Doors

A slab door is just the door itself — no frame, hinges, or hardware. Best for:

• Replacing an existing door in a good frame
• DIY enthusiasts who want to fit hardware themselves
• Budget-conscious buyers

Browse our complete range of internal doors.

Pre-Hung Doors

Pre-hung doors come fitted in a frame, ready to install. Ideal when:

• Creating a new doorway
• Replacing a damaged frame
• You want faster, easier installation

FD30 Fire Door Requirements in UK Homes

Building regulations require fire doors (FD30 rated) in certain areas:

• Integral garages — doors between garage and house must be FD30
• Loft conversions — all doors on the escape route
• HMOs and flats — specific fire safety requirements apply
• Three-storey homes — doors to habitable rooms on escape routes

Shop our FD30 and FD60 fire doors for complete peace of mind.

Popular Door Styles & Finishes

Oak Doors — Warmth and Character

Oak internal doors bring natural warmth and timeless character to any home. The distinctive grain pattern adds visual interest, and oak ages beautifully over time. Perfect for traditional and rustic interiors.

Explore our oak door collection.

Black Doors — Contemporary and Bold

Black internal doors make a striking contemporary statement. They work brilliantly with modern, industrial, and minimalist interiors, creating dramatic contrast against light walls.

View our black door range.

White Doors — Clean and Versatile

Classic white doors suit virtually any interior style. They brighten spaces, pair with any colour scheme, and offer timeless appeal that never dates.

See our white internal doors.

Glazed Doors — Let in the Light

Glazed internal doors feature glass panels that allow natural light to flow between rooms, making spaces feel brighter and more open. Available in clear, frosted, and decorative glass options.

Browse our glazed door collection.

Barn & Sliding Doors — Space Saving

Sliding barn doors are perfect for rooms where a traditional swing door would take up valuable floor space. They add character and style while maximising usable room area.

Explore our barn and sliding door range.

Need Expert Advice?

Our door specialists are here to help you choose the perfect doors for your home. Call us on 01282 270214 or email sales@pricecart.co.uk.