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Door Frames, Door Linings & Casings

Whether you’re looking for door frames, door linings or door casings, we have a wide selection of size and colour options to complement most door styles. Our useful kits include everything you need to build a top hung internal door system, and they can be used with a variety of internal wooden doors.

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  • Timber Redwood Door Casing 38 x 150 x 762mm

    Timber Redwood Door Casing 38 x 150 x 762mm

    Door casings are ornamental trimmings that also provide support for hanging and maintaining an entranceway in place. They come with a timber stop already installed to prevent swing-through, saving you time from having to install one individually.
  • Timber Redwood Door Casing 38 x 100 x 762mm

    Timber Redwood Door Casing 38 x 100 x 762mm

    Door casings are ornamental trimmings that also provide support for hanging and maintaining an entranceway in place. They come with a timber stop already installed to prevent swing-through, saving you time from having to install one individually.
  • Door Stop Timber Moulding Redwood Ovolo 16 x 38mm Door Stop Timber Moulding Redwood Ovolo 16 x 38mm

    Door Stop Timber Moulding Redwood Ovolo 16 x 38mm

    Supplied unfinished, this Doorstop is designed to be personalised with your own choice of paints and finishes, allowing you to match the Doorstop to your colour scheme as needed. The finished size of this product that you will recieve is: 12mm x 33mm
  • Timber Redwood Door Casing 38 x 125 x 762mm

    Timber Redwood Door Casing 38 x 125 x 762mm

    Door casings are ornamental trimmings that also provide support for hanging and maintaining an entranceway in place. They come with a timber stop already installed to prevent swing-through, saving you time from having to install one individually.
  • Timber Redwood Door Casing 38 x 140 x 762mm

    Timber Redwood Door Casing 38 x 140 x 762mm

    Door casings are ornamental trimmings that also provide support for hanging and maintaining an entranceway in place. They come with a timber stop already installed to prevent swing-through, saving you time from having to install one individually.
  • Timber Door Casing Firecheck 50 x 140mm

    Timber Door Casing Firecheck 50 x 140mm

    This Firecheck Timber Casing 50mm is compatible with fire doors to offer protection in the case of a fire. Manufactured from Redwood, this timber door casing is also attractive and long lasting. Finished sizes are approximately 5-6mm smaller than nominal...
  • Timber Door Casing Firecheck 50 x 150mm

    Timber Door Casing Firecheck 50 x 150mm

    This Firecheck Timber Casing 50mm is compatible with fire doors to offer protection in the case of a fire. Manufactured from Redwood, this timber door casing is also attractive and long lasting. Finished sizes are approximately 5-6mm smaller than nominal...
  • Timber Redwood Door Casing 38 x 100 x 838mm

    Timber Redwood Door Casing 38 x 100 x 838mm

    This Untrenched Timber Redwood makes an attractive door casing for internal applications. Timber redwood door casing is available in multiple sizes. Nominal sizes vs Finished size options: 150mm; 144mm, 140mm; 133mm, 125mm; 119mm, 115mm; 108mm 100mm;...
  • Timber Redwood Door Casing 38 x 115 x 838mm

    Timber Redwood Door Casing 38 x 115 x 838mm

    This Untrenched Timber Redwood makes an attractive door casing for internal applications. Timber redwood door casing is available in multiple sizes. Nominal sizes vs Finished size options: 150mm; 144mm, 140mm; 133mm, 125mm; 119mm, 115mm; 108mm 100mm;...
  • Internal Door Linings Including Stop 32 x 100mm

    Internal Door Linings Including Stop 32 x 100mm

    Manufactured from whitewood this door lining kit is 32mm x 100mm. It includes a door stop and is incorporated into the kit to make life easier. Fully chain of custody certified and made from responsibly sourced wood.
  • Timber Redwood Door Casing 38 x 115 x 762mm

    Timber Redwood Door Casing 38 x 115 x 762mm

    Door casings are ornamental trimmings that also provide support for hanging and maintaining an entranceway in place. They come with a timber stop already installed to prevent swing-through, saving you time from having to install one individually.
  • Whitewood Planed Timber Door Lining Kit Including Stop Firecheck 38 x 140mm

    Whitewood Planed Timber Door Lining Kit Including Stop Firecheck 38 x 140mm

    The 38x140mm FC (Fire Check) Lining includes a Stop. The Door Lining is FD30 accredited, made from timber and trenched to suit 2ft 6in / 2ft 9in doors. It is also reversible.
  • Intumescent Brown Smoke & Draught Seal 20 x 2100mm

    Intumescent Brown Smoke & Draught Seal 20 x 2100mm

    This brown dual bladed intumescent seal stops smoke and cuts out draughts. Designed with a discreet look that blends into the door frame. Simple to install, with a self adhesive strip, it can also be cut to size quickly and easily for convenient fitting.
  • Intumescent Brown Smokeseal 20 x 2100mm

    Intumescent Brown Smokeseal 20 x 2100mm

    This brown fire and smoke intumescent seal has a nylon pile brush to stop smoke as well as the standard intumescent strip. Designed with a discreet look that blends into the door frame. Simple to install, with a self adhesive strip, it can also be cut to...
  • Intumescent Fire and Smoke Seal White 2.1m Loose Lengths 15 x 4mm Intumescent Fire and Smoke Seal White 2.1m Loose Lengths 15 x 4mm

    Intumescent Fire and Smoke Seal White 2.1m Loose Lengths 15 x 4mm

    The 15mm x 4mm White Intumescent Fire and Smoke Seal is fitted to a fire door and is designed to swell when it meets heat, filling any gaps that may exist between the door and the door frame, preventing smoke from passing through. Intumescent strips are...
  • Intumescent Fire and Smoke Seal White 2.1m Loose Lengths 2100 x 10 x 4mm Intumescent Fire and Smoke Seal White 2.1m Loose Lengths 2100 x 10 x 4mm

    Intumescent Fire and Smoke Seal White 2.1m Loose Lengths 2100 x 10 x 4mm

    The 10mm x 4mm White Intumescent Fire and Smoke Seal is fitted to a fire door and is designed to swell when it meets heat, filling any gaps that may exist between the door and the door frame, preventing smoke from passing through. Intumescent strips are...
  • Redwood Internal Door Linings Including Stop Firecheck FSC (2'6/5'9) 33 x 108mm Redwood Internal Door Linings Including Stop Firecheck FSC (2'6/5'9) 33 x 108mm

    Redwood Internal Door Linings Including Stop Firecheck FSC (2'6/5'9) 33 x 108mm

    Manufactured from high quality Redwood this fire check door lining kit is 33mm x 108mm. It includes s door stop and is incorporated into the kit to make life easier. The Door Lining is FD30 accredited, made from timber and trenched to suit 2ft 6in / 2ft...
  • Timber Door Casing Firecheck 50 x 100mm

    Timber Door Casing Firecheck 50 x 100mm

    Door Casing made from Redwood that is FD30 Accredited. It is unfinished, allowing you to choose the final finish.
  • Timber Door Casing Firecheck 50 x 115mm

    Timber Door Casing Firecheck 50 x 115mm

    This Firecheck Timber Casing 50mm is compatible with fire doors to offer protection in the case of a fire. Manufactured from Redwood, this timber door casing is also attractive and long lasting. Finished sizes are approximately 5-6mm smaller than nominal...
  • Timber Internal Door Casing Firecheck PEFC 50 x 150mm

    Timber Internal Door Casing Firecheck PEFC 50 x 150mm

    This Firecheck Timber Casing 50mm x 150mm is compatible with fire doors to offer protection in the case of a fire. Manufactured from Redwood, this timber door casing is also attractive and long lasting.
  • Timber Redwood Door Casing 38 x 125 x 838mm

    Timber Redwood Door Casing 38 x 125 x 838mm

    This Untrenched Timber Redwood makes an attractive door casing for internal applications. Timber redwood door casing is available in multiple sizes. Nominal sizes vs Finished size options: 150mm; 144mm, 140mm; 133mm, 125mm; 119mm, 115mm; 108mm 100mm;...
  • Timber Redwood Door Casing 38 x 140 x 838mm

    Timber Redwood Door Casing 38 x 140 x 838mm

    This Untrenched Timber Redwood makes an attractive door casing for internal applications. Timber redwood door casing is available in multiple sizes. Nominal sizes vs Finished size options: 150mm; 144mm, 140mm; 133mm, 125mm; 119mm, 115mm; 108mm 100mm;...
  • Timber Redwood Door Casing Untrenched Firecheck 63 x 100mm

    Timber Redwood Door Casing Untrenched Firecheck 63 x 100mm

  • Timber Redwood Door Casing Untrenched Firecheck 63 x 115mm

    Timber Redwood Door Casing Untrenched Firecheck 63 x 115mm

    This Timber Redwood makes an attractive door casing for internal applications. This door casing is untrenched.

Door Frames, Door Linings & Casings

A door frame is often overlooked or never acknowledged for the role it plays in holding a door in place. It’s important to know which kind of door you need, and at Howarth, we have a wide selection of door frames and sizes for you to choose from.

A standard door frame size is 6ft 8in, with the door frame size being generally wider than the door opening. Other door frame sizes can come as small as 6ft 6 inches, and as tall as 6ft 8.3 inches.

What is door lining?

A door lining is a frame, usually made of wood, that is used to prevent doors from jamming or sticking and is also used to conceal the brickwork or timber surrounding the door itself. The lining makes the door look more appealing, makes it easier to use, and protects the door from damage. To be able to work out door lining sizes, you will need to measure the height, width, thickness, and depth.

Door lining sizes

The normal thickness for door linings is usually about 1 1/82’’, whereas MDF door linings can fit door sizes for up to 204mm in height and 976mm in width. For door lining opening sizes, it’s important to leave 910mm for a standard door, and 1981mm for cupboard and wardrobe doors because of the better range of sizes available.

For door casing sizes, the most widely used door casing size is 2 ¼ inches in width but can range up to 3 inches. You will also need a door casing gap of 2mm around the sides and the top and a gap of 8mm around the bottom of the floor. Howarth Timber and Building Supplies offer untrenched casing sets which give you the freedom to place the grooves where you want them. This is useful if you are installing doors that are a non-standard size.

For further information and expert advice on door frames, please contact your friendly local Howarth branch.

Frequently Asked Questions

Do I need to have an internal door frame, door lining, or both?
They serve different purposes, so when installing a new or replacement internal door that looks neat and opens and closes smoothly, you’ll need to have both. Internal door linings hide the gap between the door and the wall for a neat finish and prevent the door from sticking when opened and closed. Wooden door frames are the door’s supporting framework, so they attach to the door itself and hold it upright.

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