What Is a Door Frame Set?
An internal door frame set (also called a door lining set) is the structural surround that fits inside a door opening to support and hang an internal door. It consists of two vertical jambs and a horizontal head piece, forming the complete frame into which your door is fitted.
Why Choose MDF?
Our MDF door frame sets offer significant advantages over traditional timber:
- Perfectly smooth, knot-free surface — ideal for painting
- Pre-primed and ready to paint straight from the box
- Moisture-resistant MDF construction for long-lasting durability
- Consistent dimensions for easier fitting
- More cost-effective than solid timber alternatives
What’s Included in a Set?
Each single set includes: 2 x Door Jambs, 1 x Head (top piece), 1 x Stop Set. Everything you need to frame one door opening.
How to Choose the Right Door Frame Set
- Door width: Standard UK internal doors are 762mm or 838mm wide — ensure your frame matches
- Door height: Standard height is 1981mm — check your opening before ordering
- Wall thickness: Frame sets are available in different depths to suit varying wall thicknesses (typically 95mm–145mm)
- Single vs double: Choose a single set for one door leaf or a double set for double doors
Installation Tips
- Always check the opening is square before fitting
- Use a spirit level on both jambs to ensure plumb
- Pack behind the frame with timber offcuts where needed
- Secure with screws through the frame into the structural opening
- Fill, sand, and paint all surfaces for a professional finish
Shop MDF Internal Door Frame Sets
Browse our full range of pre-primed MDF internal door frame sets — delivered across the UK.