UPVC Window & Door Install & Repair

Eco Friendly Windows

All our uPVC windows are manufactured from 80% recycled uPVC, although our external surfaces are 100% virgin uPVC skin. Lock Property Services Property Services windows are low maintenance, as unlike timber windows, uPVC will not rot or require repainting.

We supply and install the following types of double glazed windows:

Casement Windows

Lock Property Services are suppliers and installers of casement windows in Northern Ireland. Versatile and perfect for new builds or replacement windows, our casement windows are our most popular type of window.

Lock Property Services Casement window installers in Northern Ireland

We can offer almost any style, shape and size of casement window depending on your needs. All windows from Lock Property Services Property Services are installed by our fully trained glaziers.

Casement Window Features

  • Internally glazed for increased security
  • Multi chambered shape for enhanced thermal efficiency
  • 100% virgin skin on all exterior surfaces
  • 70% decrease in carbon emissions lost through frames
  • Low maintenance
  • Fully welded throughout for optimum strength
  • Concealed gaskets ensuring no sight lines

Tilt & Turn Windows Northern Ireland

Lock Property Services Property Services supply and fit Tilt and Turn windows in Northern Ireland. Tilt and Turn windows’ easy operation, high security and impressive appearance make them the ideal choice for most households.

Tilt and Turn Window Operation

In the tilt position the windows provide security while permitting hot air to escape and cool air to enter the room. In the turn position the windows open inwards up to 90 degrees to allow simple cleaning from inside the room, good ventilation, and an emergency exit to escape from fire.

Tilt n Turn Window Features

  • Internally glazed for increased security
  • Multi chambered profile for increased thermal efficiency
  • Fully welded throughout for optimal strength
  • 100% virgin skin on all external surfaces
  • 70% decrease in carbon emissions lost through frames
  • “Easi-Gear” hinge for efficiency and security
  • Side hung for easy cleaning or fire escape
  • Tilt mechanism for air circulation
  • Low maintenance French Windows

Enhance the look of your home with French windows from Lock Property Services. Stylish and practical, our French windows do not just give a touch of elegance, they allow full ventilation and unhindered fire escape.

These gorgeous windows help make a light and airy ambience to any room and brings the outdoors indoors in good weather but also keeps the elements out of your home in bad weather.

All Lock Property Services Property Services French Windows are made to order and are available in a variety of styles, finishes and colours.

French Windows features

  • Internally glazed for increased security
  • Fully welded for maximum strength and reliability
  • 100% virgin skin on all external surfaces
  • Multi chambered profile for enhanced thermal effectiveness
  • 70% reduction in carbon emissions lost through frames
  • Low maintenance

Velux Windows Northern Ireland

Lock Property Services Property Services supply and install Velux windows in Northern Ireland. Installing Velux Roof Windows can change your home by turning previously dark areas into light, airy spaces.

Velux Roof Windows

These high quality and performance roof windows are specially designed to let more natural light into your home and are ideal for lofts, open ceilings and flat roofs or if you want to create a light shaft, atrium or sun tunnel. Velux windows also provide excellent heat and sound insulation and are strong and durable enough with withstand the elements.

Electric and solar powered Velux windows

Lock Property Services Property Services also supply and install electric and solar powered Velux windows and come with touch screen control pads for full control opening and closing windows that are out or reach.

Lock Property Services Property Service’s fully trained glaziers can visit your home, assess your roof, and advise on the best type of Velux window for your requirements as well as the best location for the window in your roof.


Double glazing all the windows in your home can be a huge job and an expensive investment but the savings you may make in the long term may make it worth it.

Many people assume double glazing is as good as it gets for noise reduction. In fact, secondary glazing can be up to five times better at tackling noise pollution. Double – and even triple – glazing has multiple panes of glass separated by a gap typically less than 20mm. The thickness of the glass is also important.

Condensation is not caused by double glazing (although new windows can sometimes make condensation problems worse, by cutting out draughts). Treatment for condensation is ventilation (to vent moisture-bearing air to the outside) and heating (to raise surfaces above dew point temperature).

Tinted glass will help reduce heat transfer in summer but equally blocks the valuable solar heat gain in winter. Once the sun is off the glass the double glazing effectively insulates your home from heating up in summer and prevents heat loss in winter.

If the glass inside your double glazing has become foggy or misted, this is a sure sign that your sealed unit has failed. Some companies can repair all types of double glazed window unit, even if you have a leaded window pattern.

They can be fitted in the rain, although when they are sealed outside with silicone, if the bricks/wall is too wet, the silicone won’t have a good bond to it. Down the line the silicone could let in water.

Retrofit double-glazing is the process of replacing your existing single glazing with double glazed units. The process is quick and unobtrusive.

It’s very difficult to break a double glazed window without making a noise. All modern windows come with double glazing, which means that there are at least two obstacles to overcome in order to break the glass. First, there are the two panes of glass. Second, the gas between the panes works as shock absorber.

As the air gap is very narrow, the air cannot circulate freely and thus reduces heat loss by convection as well. The radiation heat loss is merely reduced by efficient double glazing. It is found that almost 54 to 64 percent total heat loss can be reduced through Efficient Double Glazing.

The space in between can be 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm or 20mm. Hence if you are looking at a Double Glazed unit that has a spacer of 12 mm, the overall thickness is 12mm (space) plus 8mm (glass) totalling 20mm thickness and this is expressed as 4 12 4.

Firstly, energy efficiency ratings are coded by letters between A and G. A is the most efficient, while G is the least efficient. So, a A- rating would mean the windows don’t lose energy as they only let out as much heat as they let in from the outside. However, with an A+ window, it lets in more heat than it lets out.

Windows are a functional update that are not so noticeable visually, but are much appreciated for improving energy efficiency. An expenditure on new windows can bump up an asking price on a house.

The biggest issue with condensation is when it forms between the two panes of glass; this shows that your double glazing has failed and it will not be keeping your home as warm as it should so will need to be replaced.

Insulating glass (IG), more commonly known as double glazing (or double-pane, and increasingly triple glazing/pane), consists of two or three glass window panes separated by a vacuum or gas filled space to reduce heat transfer across a part of the building envelope.

Energy rating of thermal insulation glass improved. Double glazing window energy efficiency can be further increased by substituting dehydrated air with an inert gas, such as argon, xenon or krypton within the unit. Argon, which has 34% lower thermal conductivity than air, is the most commonly used.

Most people think the gap caused by broken window hinges is the seal shrinking. On older uPVC and aluminium windows, window glazing seals were used to hold the glass or double glazing in the window. These seals can shrink back leaving a gap between the sash and the glazing. The glazing seals can easily be replaced.


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