The Buyers Guide to Bi-Fold Doors

Your Questions Answered
Making the best bi-fold door choices for your home

bi-fold doors open up the garden and view at this home in Haworth near Keighley
Rated 5.0 out of 5 Helen Nellist

Would highly recommend Marlin windows. Installed bifold doors with meticulous planning and precision. Had a tour of the workshop and assisted through the purchase and installation process ensuring perfect fit of clearly an excellent aluminium product. Can’t recommend enough!
Have recommended to others and our builder said they were the best supplier and fitter they had ever used.


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bi-fold doors open up onto the courtyard at this home in Addingham near Ilkley
visofold 6000 bi-fold doors open up the garden and view

Imagine ourselves opening up the new Bi-fold doors, when it’s right it’s what we call our Nina Simone moment, as more than likely we will want to sing:

“It’s a new dawn, it’s a new day, it’s a new life for me and I’m feeling good!”

Of course it is possible, hard to believe I know, that Nina wasn’t singing about bi-fold doors.

Rated 5.0 out of 5 Stephen Jackson

Thank-you Marlin Windows for a great job! You designed and built all the windows in our renovation project including sliding doors and bi-folds with care and consideration. From our first contact with Adrian through to the final fitting, the service was exceptional, no request was too much trouble. The installation team were great, very friendly and thorough. I have no hesitation in recommending Marlin, we are very pleased with the results.


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corner bi-fold doors on corner of a property in the Lake District

4. Corner Bi-Folds

What if the room we want to open up is at the corner of the property? What if the ideal outside space wraps around the corner? This might seem like a problem, but actually bi-folds might well be perfect.

As long as suitable structural support is in place, bi-folds can extend such as to fully open up the corner. This makes a dramatic difference to the feel of the space, as, in effect, two walls have been drawn back.

flush threshold wheelchair accessible centre opening double bi-fold doors

5. Opening Options

Sashes can fold left or right, internally or externally, so consider which would make most sense for the opening. Choose to place the opening at the side so the sashes all fold one way to one end, which creates a single entrance door for easy access.

Or choose a middle opening to give the option of a double door.

making an opening for bi-fold doors and checking the level

6. What about creating an opening?

Removing brickwork to be replaced with bi-fold doors is not difficult, however it obviously needs expertise (usually your builder) to ensure that you maintain the structural integrity of your home.

Top hung doors need a strong lintel to bear the weight. Bottom rolling doors are supported at the foot where a damp-proof course membrane is laid.

Take the opportunity while creating the opening to allow for the frame to be sunk into the floor to create that ideal low threshold and seamless transition from indoor to out. Any low threshold opening needs to be fully weather sealed.

Rated 5.0 out of 5 Malcolm Sykes

Many thanks for supplying and installing my new bi-fold doors. The guys did an excellent job today removing my old doors and then installing my new bi-fold doors. They managed to get the old doors and frame out cleanly and then installed the new doors very neatly. All in all an excellent job well done. The new bi-fold doors look really good!


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flush threshold wheelchair friendly bi-folding doors

7. Will I be warm in winter?

Look for glazing with a U value of 1.8W/m²K or lower.

This ensures glazing exceeds the minimum thermal requirement for Building Regulations and as such will be an efficient insulator against adverse weather.

corner fitting bi-fold doors on lake shore in Cumbria

Marlin's Qualicoat standard powder coated paint finish is guaranteed for a full 25 years.

8. What upkeep do they need?

Timber does require regular painting to keep the wood sound. Aluminium requires virtually no upkeep.

colour charts for glazing

9. What colours are available?

Powder coating means a huge range of colours and textures are available including stunning anodised finishes and textured paint.

We can mix it up by choosing a different colour on the inside to out.

View the extensive range of RAL colours along with two ranges of textured paint finishes here.

Like to see a textured finish colour sample?
Just contact us and we'll be glad to post this out to you.

bi-folding doors enhance this stunning view

10. Will bi-folds add value to my property?

Bi-fold doors are very desirable, although not necessarily adding value, make a house very saleable.

Some of the worlds best homes use bi-fold doors as a dramatic feature, folding back entire walls of glass to give them a real wow factor which you can emulate in your own home.

secure by design bi fold patio door locks

At Marlin all door locking systems are fully protected as standard with the tried and tested Police recommended Avocet ABS euro cylinder to keep you and your property safe.

full width bi-folding doors open to garden at Haworth near Keighley

“I’m feeling good!”

12. What do you recommend?

Find out about quality bi-fold doors from Marlin Windows here

Talk to Marlin today by calling
01535 603909
click here.

Rated 5.0 out of 5 Tony Bedford

Had all our windows replaced with aluminum including 2 sets of bi-folds. It took a number of visits to the factory to meet with Adrian and Hannah who were both very patient and helped us choose the correct lay out and color. Very pleased with the result. Their fitters Peter and Ryan were also good to work with. Highly recommended.


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13. Featured Bi Fold Door Projects:


Rated 5.0 out of 5 Chris Hirst - Builder

"Great quality products along with great customer service. Easy to recommend."


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Rated 5.0 out of 5 Caroline Dyson

Excellent customer service from enquiry to delivery . Thank you to Hannah ,Adrian and the team for going the "extra mile".


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Aluminium bi-fold doors

Choose from our range of quality Bi-Fold Doors

Integral Blinds For Bi-Fold Doors

built in integral blinds for bi-fold doors

All bi-fold doors can be fitted with built in integral blinds

Technical advisors are on hand at the aluminium window and door showroom in Keighley in West Yorkshire

14. Where Can I Get Further Advice?

Our high quality window and door products are backed by the same high quality customer service. Technical advisors are just a phone call away to answer all your questions no matter how technical.

Typical help provided includes:

  • Choosing the right product
  • Getting the right made to measure size
  • Help with ordering
  • Threshold advice

We provide a FREE sample service to assist with surveying decisions, design considerations, or planning applications – just pick up the phone and ask.

Click To Call


Why Choose Marlin Windows?

We care...

about the quality of finish
about you, your project and your property
about your 100% satisfaction

And we are rated ★★★★★ on Google

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"our builder said they were the best supplier and fitter they had ever used"
Mrs Nellist Haworth, Yorkshire


Call 01535 603909