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Mondrain Steel doors Steel French doors


Steel replacement doors. Double and single-glazed

         Steel door gallery                Bi-folding door gallery                Door specifications               Glazing options

We supply and install steel replacement double-glazed and single-glazed doors throughout the UK, Exmouth, Exeter and surrounding East Devon.


Nothing lasts longer, has the original character or ultra slim sight lines than steel doors. Steel doors have been used for many centuries and are perfect for listed buildings and conservation areas. New double-glazed steel doors are widely accepted by local authorities for refurbishment and new build projects.


All steel replacement doors are hot dip galvanised prior to powder coating to ensure they do not rust and require little maintenance. A wide choice of colours are available (in any RAL colour). Galvanised finishes are also available.


Door sections (W20) are almost identical to those of many a year ago and offer the perfect like for like replacement, with added modern benefits. Benefits include double-glazing, draught excluders, 5 lever Mortice locks, not forgetting a maintenance free powder coated paint finish.

Steel replacement door styles and designs manufactured to your requirements...

Replacement steel single doors

Replacement steel French doors

Listed buildings

Conservation areas

Domestic & commercial use

Installation into stone mullions

Installation into timber sub-frames

Installation direct to masonry

New build or renovation

Steel replacement doors

Steel doors incorporate a 5-lever Mortice lock and thumb turn bolts located at the top and bottom of each leaf providing additional security.


W20 profiles can be internally or externally glazed using powder coated glazing beads or a traditional putty finish.

     Suitable applications

     Our steel services

Supply only (UK coverage)

Supply and install (UK coverage)

Professional site surveys

Listed building applications

Full working drawings

Hardwood/softwood sub-frames (fully finished or primed)

     Life Expectancy

Galvanised steel                 50 years +

Polyester powder coating   20 years +

Silicone sealant                   20 years +

Glazing gaskets                  15 years +

Weather seals                    15 years +

Sealed units                        10 years +

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All doors are manufactured from extremely strong W20 steel profiles.


W20 steel doors can be manufactured to replicate the originals using the same steel sections.


W20 doors can be shaped, arched and curved with a range of glazing options such as solid steel Georgian bars or leaded lights.

Replacement steel doors can open inward or outwards and incorporate projecting parliament hinges to fold back completely when opened.


With equal or odd leg steel sections, W20 doors can be installed into timber sub-frames or direct to masonry.

Request a quick quote

To enable us to provide an efficient service, please use our dedicated steel door, quick quote enquiry page.


PVC        -        ALUMINIUM        -        HARDWOOD        -        STEEL        -        COMPOSITE

Steel windows and doors manufactured in 8-10 weeks

W20 steel French doors quickquotebutton2


W20 steel door technical and sections

Are W20 steel doors thermally broken? - No, the W20 system does not have a thermal break, though highly effiecient 16mm Krypton filled double-glazed units help combat condensation.


How wide can you make a W20 steel single door? - The maximum width of a single door including frame is 900mm. We can manufacture oversized doors, but would not offer a warranty.


How wide can you make W20 French doors? - The maximum width of a double opening French door including frame is 1800mm. We can manufacture oversized doors, but would not offer a warranty.


How tall can you make the doors? - Doors can be manuactured up to 2400mm in height. Any door over this height would require a glazed light above.


Are the doors single or double-glazed? - We can provide single or double-glazed doors for internal or external use.


What is the U-Value of your double-glazed doors? - Overall U-Values vary depending upon door size and style. The centre pane U-Value of our double-glazed units is 1.1 Wm2K. The centre pane method is used for building regulations compliance for new build and replacement applications.


Can your steel doors be fire rated? - We are able to supply fire rated glass and steel glazing studs. Though not specifically fire rated, it is possible to have our W20 steel doors approved by your local building control officer. Please check.

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We provide full working drawings tailored to your order for you to check and approve, prior to passing into production.


Working drawings detail cill, opening configuration, design and manufacture sizes helping you visualise exactly how your doors will look.

W20 door & screens - Typical outer frame dimensions