The Cost to Fit Secondary Glazing

All you need to know about having your windows fitted with secondary glazing including costs of materials, labour and time frames.

Cost to Fit Secondary Glazing

What the job entails

With secondary glazing an additional pane of glass in a frame is fitted to existing windows unlike double glazing where you would remove the existing window and replace it. Secondary glazing offers additional energy and sound insulation for your home. Secondary glazing is cheaper than double glazing and is a great option if you cannot replace the existing glazing due to living in a listed property. In terms of exterior appearance, secondary glazing is very discreet, especially when using a lightweight aluminium frame. In addition, secondary glazing is pretty easy to install as a DIY project and can even be bought in the form of DIY kits to lower the costs even further.

There are various types of DIY secondary glazing systems available today which can be delivered to your home already cut to size and including all the fittings and fixtures you require. They are relatively simple to install and can also be easily removed if required. The first step is to measure the existing window Then order the secondary glazing unit to fit. When the secondary glazing arrives you simply lift the secondary glazed unit into the correct position then pack around the unit to ensure it is level and square. Then you can fix the secondary glazed unit into position using screws in the pre-drilled fixing points around the new frame. There is little disruption or mess installing secondary glazing and an entire home can be finished in just a few hours.

If you are fitting brand new secondary glazing you will find that the new frames can often meet the existing windowsill and wood surround look pretty grimy! So prior to fitting secondary glazing it can be a good idea to redecorate or at least apply a fresh coat of gloss to any existing woodwork. You may also have to consider getting new blinds as the existing blinds will often get in the ay of the secondary glazing unit.

If you live in a period or listed building it is unlikely you will be permitted to install double glazing. In situations where you cannot get planning permission for traditional double glazing, secondary glazing does not require any planning permission and can be easily installed DIY without altering the external look of the building while still offering many of the benefits of double glazing such as effectively reducing noise pollution and offering much improved thermal insulation.

Magnetic secondary glazing is even easier to install but offers much of the same insulation and noise reduction benefits. It also costs less than permanent secondary glazing as it simply uses magnets to attach to the existing window frame and therefore there are no installation costs. In addition, magnetic secondary glazing can be removed easily during the summer months when the additional insulation is not required. However, unlike traditional secondary glazing, they cannot be opened so must be removed completely to open the existing window.

There are problems which can occur with secondary glazing as there are some critical weaknesses. Secondary glazing is more prone to condensation because it's not a sealed unit, so any humidity in the surrounding air can condense on to the cold window glass which is difficult to easily wipe due to the secondary glazing unit. In addition, the lack of any vacuum between the panes of glass means that secondary glazing does not insulate quite as well as double glazing. These inherent problems are exacerbated by the poor installation of secondary glazing. You must ensure when fitting secondary glazing that you seal tightly all around the window frame using draught proof strips if required to hug surface contours.

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The Cost to Fit Secondary Glazing

The average material cost to install secondary glazing will depend on how many windows there are and the type of the glazing. Sash windows are slightly more expensive than horizontal sliding windows. The secondary glazing can cost anywhere from £100 to £200 each.

The average window specialist will usually charge around £150 per day in labour but will usually work in a pair with an average daily cost of £250. THe job should be completed within 1-2 days depending on the size and amount of windows you have which need secondary glazing.

Below are some estimated costs of hiring a window specialist to fit secondary glazing:

Job Description Avg. Cost Duration
Fit Secondary Glazing to 4 Windows £800-£1000 1 day
Fit Secondary Glazing to 8 Windows £1200-£1500 1 day
Fit Secondary Glazing to 12 Windows £1800-£2100 1-2 days

Cost Breakdown

Individual costs to install secondary glazing to 12 windows- Total Cost: £2,000






Waste Removal


Secondary glazing is a custom-made window frame which is attached to the inside of your existing window to add additional sound and noise insulation.
Secondary glazing units are typically manufactured from timber or aluminium.
It is difficult to give an exact figure on how much the noise will be reduced by secondary glazing as every property is different and individuals can be affected differently by noise pollution. However, many secondary glazing units claim to reduce noise by as much as 80% or over 50 decibels.
Secondary glazing can enhance thermal insulation of the existing window by as much as 60%. This comes very close to the performance of a Class A double glazed window.
Secondary glazing can significantly reduce or even eliminate condensation problems. However, condensation problems differ from property to property and even from window to window. So secondary glazing manufacturers will not guarantee to completely eliminate condensation.
Pretty much every secondary glazing window can be simply opened using hinged or sliding units for quick and easy access for extra ventilation or to clean the existing window.
Secondary glazing offers much of the benefits of double glazing such as improved heat retention and greatly reduced noise reduction well significantly reducing draughts and condensation. But and much easier to install.
In most cases secondary glazing we'll meet old requirements in terms of Building and Conservation regulations associated with listed buildings. This is possible as secondary glazing is completely reversible so does not affect the Fabric of the building while at the same time it does not alter the external appearance.
The installation time will vary depending on the size and complexity of the secondary glazing units. But for a typical living room window, the insulation should take less than 1 hour so an average 3-bedroom property could have secondary glazing installed in less than one day.