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Collection: Door Thicknesses 40mm

Door Thicknesses 40mm helps you filter to sizes that fit first time. Browse modern, shaker, panelled, and glazed looks across materials from oak to durable laminates. Solid and semi solid cores improve feel and sound control, with fire rated options where specified. Standard sizing streamlines replacements, refurbishments, and whole home planning. We supply nationwide with clear lead times, and offer optional professional fitting for accuracy, warranty protection, and a clean finish. Use filters by style, material, size, and glazing to compare quickly and order with confidence.

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286 products

Wooden parquet floor with a herringbone pattern
New

XL Joinery

INTERNAL OAK RAVENNA DOOR

Regular price From £142.17
Sale price From £142.17 Regular price
Wooden door with horizontal slats
New

XL Joinery

INTERNAL OAK PALERMO FIRE DOOR

Regular price £138.80
Sale price £138.80 Regular price
INTERNAL OAK PALERMO
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XL Joinery

INTERNAL OAK PALERMO

Regular price From £92.16
Sale price From £92.16 Regular price
INTERNAL OAK MONZA
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XL Joinery

INTERNAL OAK MONZA

Regular price From £115.76
Sale price From £115.76 Regular price
Wooden door with a vertical panel design
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XL Joinery

INTERNAL OAK MESSINA FIRE DOOR

Regular price From £146.95
Sale price From £146.95 Regular price
Wooden door with a vertical panel design
New

XL Joinery

INTERNAL OAK MESSINA

Regular price From £112.29
Sale price From £112.29 Regular price
INTERNAL OAK LOUIS DOOR WITH RAISED MOULDINGS
New

XL Joinery

INTERNAL OAK LOUIS DOOR WITH RAISED MOULDINGS

Regular price From £158.30
Sale price From £158.30 Regular price
Wooden door with a circular design in a plain background
New

Online Door Market – trading name of FBS Doors Ltd

INTERNAL OAK CALABRIA WITH RAISED MOULDINGS

Regular price From £198.53
Sale price From £198.53 Regular price
Wooden door with a simple design featuring two horizontal panels.
New

XL Joinery

INTERNAL OAK ANDRIA WITH RAISED MOULDINGS

Regular price From £157.19
Sale price From £157.19 Regular price
Wooden door with a glass panel on a white background
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XL Joinery

PRE‑FINISHED PALERMO ORIGINAL 1 LIGHT INTERNAL OAK DOOR WITH CLEAR GLASS

Regular price From £167.04
Sale price From £167.04 Regular price
Wooden door with a natural finish and geometric design
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XL Joinery

INTERNAL OAK VERONA FIRE DOOR

Regular price From £250.24
Sale price From £250.24 Regular price
Wooden door with a natural finish and geometric design
New

XL Joinery

INTERNAL OAK VERONA

Regular price £163.38
Sale price £163.38 Regular price
INTERNAL OAK VICTORIAN 4 PANEL DOOR
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XL Joinery

INTERNAL OAK VICTORIAN 4 PANEL DOOR

Regular price From £95.62
Sale price From £95.62 Regular price
Wooden door with glass panels
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XL Joinery

INTERNAL OAK WORCESTER PAIR WITH CLEAR GLASS

Regular price £103.58
Sale price £103.58 Regular price
White abstract design on a white background
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XL Joinery

INTERNAL WHITE PRIMED VERONA WITH CLEAR GLASS

Regular price From £134.58
Sale price From £134.58 Regular price
White door with a modern design on a white background
New

XL Joinery

INTERNAL WHITE PRIMED SALERNO WITH CLEAR GLASS

Regular price From £134.58
Sale price From £134.58 Regular price
White door with vertical slats on a white background
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XL Joinery

INTERNAL WHITE PRIMED WORCESTER DOOR PAIR WITH CLEAR GLASS

Regular price £258.62
Sale price £258.62 Regular price
Wooden door panel with a plain design on a wooden background
New

XL Joinery

INTERNAL OAK PATTERN 10 DOOR

Regular price From £104.04
Sale price From £104.04 Regular price
Pair of metallic silver doors with vertical ribbed design on a white background
New

XL Joinery

INTERNAL WHITE PRIMED SUFFOLK 1L PAIR WITH CLEAR ETCHED GLASS

Regular price £245.85
Sale price £245.85 Regular price
INTERNAL WHITE PRIMED SHAKER DOOR PAIR WITH CLEAR GLASS
New

XL Joinery

INTERNAL WHITE PRIMED SHAKER DOOR PAIR WITH CLEAR GLASS

Regular price £242.21
Sale price £242.21 Regular price

What Our Customers Say

"Brilliant quality and quick delivery! The oak internal doors completely transformed our home. Great communication and service from start to finish."

Sarah Thompson

Manchester

"Really impressed with how easy it was to order online. The doors arrived well-packaged and exactly as described. Solid, stylish, and ready to fit."

James Patel

Birmingham

“Fantastic experience! We needed doors in a hurry, and the team made it so simple. Beautiful finish and excellent value for money.”

Laura Jenkins

Leeds

“Professional, friendly, and reliable. You can tell the products are chosen with care. Our new composite front door looks amazing and feels secure.”

Mark Davies

London
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