As you might expect, larger windows like bay windows are more expensive. A small bathroom window might cost you £150 whereas a regular 180cm x 120cm on the other hand might cost upwards of £350, depending on the style chosen. But this is only one of the factors influencing double glazing costs.
Certain styles are easier to assemble and install, while others require more work; this can add to the price. If you want to work within a budget and ensure good value for money, you’ll need to know about the different types of windows available, their prices, and what’s going to suit the style of your home.
- Casement windows
- French casement windows
- Sash windows
- Flush sash windows
- Tilt and turn windows
- Bay windows
- Bow windows
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What Else Affects The Average Cost Of Double Glazing A 3 Bedroom House?
Replacement might seem a more economic option than installing new units but the cost involved in dismantling the existing frames and disposing of them might well add up to more than new uPVC windows, making it an uneconomic choice.
Don’t forget you may also have to pay for a survey and assessment, and there could be additional operating expenses. This will include scaffolding hire for windows that are not on the ground floor.
Window Styles
Complex designs like sash windows or tilt and turn windows cost more than something more simple like casement windows. Features like bay windows have several different facets so will always incur a higher price than a more straightforward choice, like double hung casement windows. You can significantly lower the cost of double glazing by just choosing a more straightforward, simple design. Double hung windows might look great, but their creation and installation will always come at a higher price.

Choice Of Windows Frames
There are 3 main choices of frame material for your windows:
- uPVC
- Wooden windows
- Aluminium windows
Each different material will impact the cost to double glaze a 3 bedroom house. uPVC is usually the cheapest option as well as being the easiest to maintain.
uPVC is one of the most common types of window frames found on UK homes. They are lightweight, durable, energy-efficient, and cost-effective, which makes them an obvious choice for most properties. uPVC is available in lots of different styles like casement windows and even sliding sash windows. However, it doesn’t have the natural look of wood, although for some people, this is the least of their concerns.
Aluminium frames have a sleek, contemporary look and are very durable. They are lightweight, so handling costs are lower. Aluminium double glazed windows also have the largest number of colour options available, but they do attract a higher price per unit.
Wooden window frames are the most natural in appearance, but also the most expensive. They are energy efficient unlike old-fashioned timber single glazing, however you will need to put a lot more time and effort into maintaining them so that they perform well and stay looking good.
Finishes For Your Windows
The average cost of double glazing a 3 bedroom house also changes depending on the finishes and effects you want for your windows.
Instead of standard white handles, you can choose chrome or gold fittings. These add style and character but come with a higher price tag. For some materials, you can also choose the colour you want, ideal if you want to ensure your house matches your style or fits in with a certain theme. Extra security measures like multi point locking systems are also available to make your home as safe as possible.
If your window is more than 80cm from the floor, then it’s a requirement to fit toughened glass. This glass product is treated to ensure that if it breaks, it will shatter into harmless crystals rather than dangerous shards which cause injury to family members and pets.
You can also consider coloured glass panels, bars, and other design features; these all add to the overall price of your windows.
Installation Costs
The average cost of double glazing a semi detached house can be significantly affected by installation costs, and the prices charged by double glazing installers can vary enormously. For example, a one-person local company might replace a single window unit for much less than a large, national supplier. A local contractor will be able to self-regulate their quality and value their reputation. They’ll also have lower overheads which will translate into a cheaper cost. They might not have a minimum job size, either. The other benefit of a company operating locally is that you can ask to see other jobs they’ve completed, and get reviews and feedback from previous clients in your area.
However, homeowners can reap benefits if they are refurbishing a whole property with double glazed windows as a larger company can often offer discounts which make them a more attractive choice than a local supplier. These companies put a lot of time and effort into training their installers, too. Homeowners can benefit from greater expertise, standardised services, and certifications too. However, it’s fair to say that most salespeople in these companies start with a higher figure so you may need to negotiate to get the best price.
One thing you have in your arsenal that most others don’t? Our services. We work tirelessly to help connect homeowners with the perfect installer for their double glazing needs. All of our installation partners are vetted and accredited and have the right reputation to ensure a quality job. Why not compare installers with us today?
Thermal Efficiency
All double glazing is thermally efficient, and this enhanced insulation reduces your energy usage because less heat escapes so you can lower the thermostat on your central heating and even use it less. These savings will, over time, lower your heating bills.
Double glazed windows have two layers of glass with a pocket of air between them usually filled with a thermally efficient inert gas like argon. This sealed pocket insulates the warm air inside the house from the colder air outside. As a result, the heating system in your house does not need to work as hard.
Even an energy efficiency rating of C can lower your energy bills by up to £75 a year. However, you could reduce the cost of double glazing your 3 bed house further by getting windows with A or A+ energy ratings!
Double glazed units with a higher energy efficiency rating tend to cost more but the savings you’ll make on your heating bills will offset this over time.

What Do The Double Glazing Costs For A 3 Bedroom House Include?
It’s important that any quote you receive for double glazing your semi-detached home should be transparent and broken down into different items so you know what each individual component costs and what to expect at each stage of the work. With our online quotes, you can get a cost to double glaze a 3 bedroom house that’s easy to compare with others ensuring you make the right choice of product and installation company for your double glazing project.
Our quotes include:
- A full technical survey
- The sizes, styles, and colours of the windows
- The energy rating of either A, B, or C
- Security features
- Glazing (Toughened, Obscured, or Standard)
- Handles
- External Cills
- Full installation, inclusive of colour-matched trims, fixings, silicones, and sealants
- Registration with an industry body like FENSA or Certass
- Removal and disposal of existing windows
Find Out The Cost Of Double Glazing a 3 Bed House
The average cost of double glazing a 3 bedroom house in the UK ranges from £5,000-£7,000. The final price will come to factors like window sizes, materials, colour, finishes, installer charges, and the required energy efficiency rating.
There are a lot of variables to consider when you’re working out the cost to double glaze a 3 bedroom house, but you can get a good starting point with our double glazing calculator. This online tool will help you budget for the work, as well as evaluate the costs for different materials and finishes for your windows so you can make a fully informed decision. Relax in the knowledge that you can opt for better energy efficiency, improved security, and reduced noise as well as increasing your property’s value.If you’d like to know more about what’s involved in double glazing your semi-detached home, or find out more about how Double Glazing On The Web can help, get in touch with our team today.
Double Glazing A 3-Bed Semi – Frequently Asked Questions
How long does it typically take to double glaze a three bed house?
The answer to this will depend on the number of windows, their size and style and whether you are replacing double glazing into existing windows or opting for completely new double glazed units. Your installer will survey your house and should be able to accurately answer this for you once they have done this. On average, it takes 2-5 days to fit uPVC double glazed windows assuming there are no unforeseen problems.
Can I install double glazing myself and save money?
While it may be tempting to attempt a DIY double glazing installation to save money, it generally isn’t recommended for most homeowners. Double glazing requires specialist skills and experience as well as the right equipment. You could find you void the guarantee on your new windows because you are not an appropriately qualified and skilled fitter. If the windows are not installed correctly then they won’t offer the requisite level of performance either. Incorrect or amateur installation can result in air leaks, moisture issues, and lower thermal performance, and this will cost you money in the long run. We recommend that you have your double glazed windows installed by an expert company.
Are there any government offers or subsidies for double glazing?
Currently, there are no government grants for installing double glazing in residential buildings in the UK. There are different schemes for commercial and residential buildings. However, homeowners can be eligible for energy efficiency initiatives including he Green Homes Grant or the Energy Company Obligation (ECO) scheme, which can help with the cost of upgrading your home’s insulation and heating. Most double glazing installers are aware of any current initiatives and incentives so you can always enquire as to your eligibility when we put you in touch.
Will double glazing uplift the value of my three bedroom house?
Yes, new double glazed windows can increase the price of your 3 bedroom home. Energy-efficient houses with modern double glazing are attractive to potential buyers, as they offer the reassurance of lower heating bills, optimal comfort and enhanced security. Research suggests that you can increase the value of your home by as much as 10% with uPVC windows.
How often should I update my double glazed windows?
The lifespan of double glazed home windows varies and relies on the quality of the materials and the original installation. Typically, properly-maintained double glazed windows can last between 20-35 years.
What are the signs that double glazed windows need replacement?
If you’re seeing condensation on your windows on a regular basis or can feel draughts when the windows are closed then these are sure signs that the seal around the window frame is deteriorating. Likewise, if you experience difficulty opening and closing the windows then they may be in need of repair or maintenance, worse case scenario, you might need to replace them. Looking after your uPVC windows with a regular maintenance routine will help extend their lifespan.
How can I save money on the cost of glazing a 3 bed house in the UK?
To save money on new windows, choose a cheaper product like uPVC instead of wooden frames, or only replace some of the windows, not all. The main drawback with this is that you won’t get the full thermal benefit and lower energy bills until the whole property has double glazed windows and doors. Talk to your window installers about their quote, they may be able to suggest some ways that you can lower the cost to come within your budget.






