Blog>Cost Guides>How much do dormer windows cost?
Last updated: 27 September 2024
How much do dormer windows cost?
Adding dormer windows to a loft or attic is a great way to add light, air and extra living space. But how much do dormer windows cost? Find out here with our handy guide.
Thinking about adding dormer windows to your loft or attic?
It's a great way to make your home bigger, brighter, and comfier. Yet homeowners choose dormer windows for their loft upgrades for many other reasons.
Read on to find out how much dormer windows cost, and if they're worth it.
Dormer window installation cost
The average cost of a dormer window, including supply and installation, starts at £1,000. You will also need to factor in other costs, such as scaffolding.
Your cost for dormer windows also varies on window size, style, and material.
| Item | Low-High | Average |
|---|---|---|
| Full dormer conversion – 2 large wooden frame windows | £3,500 - £5,000 | £4,500 |
| Side dormer conversion – 1 small uPVC window | £800 - £1,200 | £1,000 |
| L – shaped dormer conversion – 3 small uPVC windows | £2,400 - £3,600 | £3,000 |
| Rear flat roof dormer conversion – 2 uPVC windows | £2,000 - £3,000 | £2,500 |
| Rear gable dormer – 1 uPVC window | £800 - £1,200 | £1,000 |
| Rear hipped dormer – 1 uPVC window | £800 - £1,200 | £1,000 |
| Scaffolding to install window(s) | £500 - £1,500 | £1,000 |
| Last updated: September 2024 Our costs are ballpark averages - get a local tradesperson to quote now | ||
See the tradespeople we've checked and recommend for your job
Factors affecting the cost of adding a dormer window
There are various dormer window styles, sizes, and materials to choose from.
So this means the average dormer window price can vary quite a bit.
When budgeting, you can keep these factors in mind;
Materials
Dormer windows are available in several materials like uPVC, composite aluminium and high-quality timber.
uPVC is one of the most cost-effective materials, making it a popular choice.
Composite and aluminium dormer windows often have a higher price tag. But, they are highly durable and can be a worthwhile investment in the long run.
Size
As the materials and labour costs increase, bigger dormer windows usually have a higher price tag.
Property type
Your dormer window price tag also depends on the size and style of dormer windows your property can accommodate.
Labour costs
Labour costs always vary for any home improvement project.
Dormer window installation labour rates often depend on location, expertise, and complexity. For example, how easy is it to access your loft?
Scaffolding
Always factor this in for any renovations on the upper level of your property.
The average price for scaffolding for dormer windows is around £1,000.
Cost to install a dormer window
The cost of dormer windows depends on several factors, such as style and size.
Typically, standard dormer windows consist of a vertical window and a separate roof that protrudes from the slope of a pitched roof.
But there are many other styles of dormer windows.
Here are some popular dormer windows you might consider;
Gable Dormer
Gable dormer windows are famous for their symmetrical design. They feature a triangular, simple, peaked roof that matches the pitch of the main roof.
This classic design can add charm, curb appeal, and extra headroom to your home. Gable dormers are popular for period homes, but they're also a good choice for modern homes.
For a rear gable dormer with one uPVC window, costs are between £800 - £1,200.
L-Shaped dormer conversion
An L-shaped loft conversion connects two dormers to an existing structure. You get the L-shape by building one dormer on the main roof and the other on the rear.
Because an L-shaped dormer conversion extends to the back and sides, it uses every inch of space.
These dormer windows are great for period properties with a back addition.
For a three uPVC window dormer conversion like this, you can spend £2,400 - £3,600.
Rear flat roof dormer conversion
Consider a flat-roof dormer loft conversion for a relatively cost-effective conversion.
With a box-like structure and a flat roof, this loft extension adds maximum headspace and floor space.
Converting a rear flat roof dormer into two uPVC windows will cost you between £2,000 - £3,000.
Hipped dormer conversion
A dormer window is added to a hipped roof with sloping sides to meet at a peak.
A hipped dormer has three sloping panes that rise from the side of the frame to meet at the ridge. It can also be converted to a gable loft.
Hipped dormers let you open up the new loft space to make room for a new staircase.
This means they're perfect for adding a staircase to a sloping roof without headroom.
A one-uPVC window rear-hipped dormer conversion will cost around £800 - £1,200.
FAQS
How much to add a dormer to an existing loft conversion in the UK?
How much dormer windows cost in the UK varies based on the;
Size
Style
Materials
Installation difficulty
A home's suitability for dormer windows
Yes, dormer windows have a significant upfront cost. But adding one to an existing loft conversion is cheaper than starting from scratch. This is because the structural work and framework are already in place.
Get 2-3 quotes from loft conversion specialists for an accurate price.
See the tradespeople we've checked and recommend for your job
Are dormer windows worth it?
Adding dormer windows to your attic or loft can be a hefty expense.
So, are they worth it for you? For many homeowners - yes.
Dormer windows are worth the investment for many reasons.
The benefits of dormer windows include;
Improved energy efficiency
Added ventilation and natural sunlight
An ideal swap where traditional windows won't work
Add charm and character to the outside of your property
Maximising usable space in lofts and other small spaces
All of the above makes your home more functional overall and can immediately boost your home's curb appeal. Which is a massive bonus if you're considering selling in the future.
But are dormer windows worth it for you? Think about your goals and budget upfront.
Make a list of what dormer windows can add to your home, then decide if the cost is worth it.
A loft conversion specialist can help you discuss all your options.
Key takeaways
Dormer windows cost between £1,000 and £4,500
The average cost of dormer windows depends on factors like size, style, material, and conversion type
There are several varieties of dormer windows to choose from
New dormer windows offer many benefits, such as improved energy efficiency, ventilation and curb appeal
Whether dormer windows are worth it depends on what you need, how you use your loft and property type
A loft conversion company can help you discuss your needs and budget
See the tradespeople we've checked and recommend for your job
More Cost Guides
More Dormer / Roof Windows Articles
See the tradespeople we've checked and recommend for your job