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Understanding the Requirements

When it comes to installing windows, doors, and glass products, it is crucial to adhere to the glazing building regulations in the UK. These regulations are in place to ensure the safety, energy efficiency, and overall performance of fenestration installations.

At Camel, we prioritise compliance with these regulations to provide our customers with the highest quality products and services. In this detailed guide, we will explain the current building regulations that apply to the fenestration industry in the UK.

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Part A - Structure

Part A of the building regulations focuses on structural safety. Although not specific to fenestration, it is essential to consider the impact of window and door installations on the structural integrity of a building.

Fenestration installations must be able to withstand various loads, including dead loads (i.e., the weight of the window), wind loads, and accidental human impact loads. Proper calculations and structural engineering expertise are necessary to meet the requirements effectively.

Safety Glazing
Safety glazing refers to glazing materials that are designed to prevent injuries in case of breakage. For certain locations, such as low-level windows, glass must comply with specific safety standards to prevent injury from impact or accidental collision.

building reguations part A
building regulations Part B

Part B – Fire Escape

Ground floor windows: Fire escape windows are required on the ground floor in any habitable room (not a kitchen or bathroom) which does not open into a hall that leads directly to an exit door.

Upper floor windows: On upper floors up to 4.5 meters from ground level, all habitable rooms (not kitchens or bathrooms) must be fitted with fire escape windows, unless the room has direct access to a protected stairway.

A fire escape window's openable area should be less than 1100mm from the floor and should open without obstruction to at least 0.33m² and at least 450mm high or 450mm wide. If one of the dimensions is at the 450mm minimum then the other dimension will need to be at least 734mm to achieve 0.33m2.

Windows fitted with our Fire Escape and Easy Clean hinges comply with the above regulations as long as the openings are sufficient; we recommend 600mm pane width to achieve the clear 450mm width.

Part F – Ventilation

Abbreviated regulations

  • Requirement that states when any improvements, extensions or renovations are done to a building, the ventilation is no worse than before the works began.
  • Recommendation that all replacement windows are fitted with trickle vents unless there is an alternative form of ventilation.
  • External air pollutants must be kept to a minimum to prevent them from staying within the confined space of a dwelling.
Trickle vent specifications for different rooms
Door and window specifications

Part K4 and N1 – Glazing Safety

Toughened or laminated glass is required in critical locations which are subject to accidental human impact, as a minimum:

  • Glazing at low levels: if the bottom of the glazing is within 800mm of the floor level.
  • Glazing in doors: any glass in doors that starts lower than 1,500mm from the floor.
  • Glazing adjacent to doors: windows/side panels starting within 300mm of the edge of a door and also starting within 1,500mm from the floor.

Part L1 – Conservation of Fuel and Power

Abbreviated regulations

  • Glazed area should not exceed 25% of floor area.
  • No worse in energy efficiency than previous windows/doors.
  • New dwelling: Windows & doors should be sealed with air sealing tape.

Minimum Energy Efficiency Ratings

Type of property Windows Rooflights Doors over 60% glass Doors less 60% glass What complies?
Existing dwelling: 1.4u (B rating) 2.2u 1.4u (C rated) 1.4u (B rated) All our windows and doors
New built – Notional: 1.2u 1.7u 1.2u 1.1u Our triple glazed A++
New built – Limiting: 1.6u 2.2u 1.6u 1.6u All our windows and doors
Diagram showing the thermal element area and the area being removed
Door specifications

Part M1 – Access

For replacement doors, the new door should be the same or more accessible than the previous door. The height of the door threshold- cill should not be made worse.

For new build homes, external doors should have a threshold-cill no higher than 35mm, except in areas of high weather exposure, in which case up to 50mm is acceptable. If that is not possible due to design considerations, a maximum gap of 35mm measured from the underside of the door leaf to the finished internal floor level would be acceptable.

The opening width of principal doors, should be a clear minimum of 775mm, from the edge of the frame to the face of the door leaf open at 090 degrees.

Part Q – Security for new builds and extensions

Accessible (roughly somewhere a burglar could possibly reach) windows and doors must:

  • Comply with British Standards PAS 24:2012 (also usually included in Secured By Design).
  • Main entrance doors must have a spyhole or clear glass, and a door chain, and any letter plates need to comply with TS008.
  • Windows that open without key locking must have laminated glass. (Our windows have key locks on all openers).
  • Door glazing and glazing near doors (side panels or windows) must be laminated.
building regulations Part Q
camel installers installing glass balustrades
Camel installer's working on a bar's roof bring glass balustrade sheets up
installers from camel glass and joinery installing frameless glass balustrade at a golf course

Contact Camel for More Information

At Camel, we understand the importance of complying with glazing building regulations. Our team of experts is well-versed in the technical requirements outlined in the regulations and ensures that all installations meet or exceed these standards.

By choosing us as your fenestration provider, you can be confident that your project will be carried out in full compliance with the latest building regulations, ensuring the safety, performance, and energy efficiency of your windows, doors, and glass products.

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We want to send our thanks to everyone at Camel Glass from first contact via telephone; survey; and fitting – you are all so friendly and helpful, and the workmanship is first class.    We’re delighted with the install done by Mike with Glen and we’ve had so many compliments as to the standard of the doors, the finish, and how good they look...

Sharon and Phil Newcombe

May I take this opportunity to thank you and all the team in Barnstaple for your care and attention to installing my new front door and replacing a ‘blown’ panel in my conservatory. Everyone has been most helpful and professional. I am very pleased with everything. I have actually recommended you to friends who live near Shebbear. Thank you all for an excellent...

Gillian Reynolds

A thoroughly excellent service. Both the composite front door and pvc back door were very good quality and fitter Andy was very friendly, helpful and extremely skilful, everything was finished to perfection and we are extremely happy. We would recommend this company.

Phil Medlin

Called Camel glass in to fix an Everest door handle and door. They turned up on time, and quickly too, sorted out one problem, then ordered in the new handle which was fixed within the week. Result no more leaking door and handle now works. All the chaps were polite, friendly, efficient and didn't leave a scrap of mess.

J Anson

I wanted to email and say just how totally impressed I am with Sam and Terry. Matt and his crew were also brilliant on installation day, but Sam and Terry have just raised the bar in terms of customer service, willingness to find a solution and by being incredible ambassadors for Camel Glass. They also have an incredible eye for detail!

Ben Lillie

Five years ago I chose Camel to supply & fit a number of windows, a back door and a front door for me in my house in Combe Martin. I was delighted with the price that I paid and the result. I wrote just to let you know that I was very please with the result and that the fitters had done a...

Mr W.G.Howard

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