Change back door to a window

Question

Considering buying a house, but I will need to make the most out of the space in a small kitchen as there's not enough room for a washing machine. So i'm thinking of removing the back door to the garden, bricking it up halfway, then putting a new window in on that wall above the sink and washing machine. Leaving the plumbing in place. 

How much would that cost? 

I am also then considering changing a living room window into a single back door, to regain access to the back garden. How much would that cost? 

Thanks!

Nicholas · Accepted Answer

Here’s a rough estimate for both jobs:

1. Removing the Back Door & Installing a Window Above the Sink
	•	Bricking up halfway: £400–£800 (depends on materials and finish)
	•	New window supply & install: £500–£1,200 (uPVC being the cheaper option, aluminum or timber being more expensive)
	•	Plastering & finishing inside: £200–£500
	•	External render or brick matching: £300–£800 (depending on finish)
	•	Total estimated cost: £1,400 – £3,300

2. Changing a Living Room Window into a Back Door
	•	Removing the existing window: £100–£300
	•	Cutting down the brickwork for door opening: £500–£1,000 (structural work, may need a lintel)
	•	New door supply & install: £800–£2,000 (material choice matters—uPVC is cheaper than composite or aluminum)
	•	Making good internal & external finishes: £300–£800
	•	Total estimated cost: £1,700 – £4,100

Total for Both Jobs:
	•	Low-end: ~£3,100
	•	High-end: ~£8,400

All rough estimates depending on various factors; Final cost will depend on materials, location of the work area, and any unexpected structural work.

Alistair · Answer

Depending on quantity and specifications of door and window around 3 to 4 k

James · Answer

many different ways and outcomes and without seeing the job can never give an accurate estimate but based on the information provide.

Estimate for bricking the backdoor up and installing a window and making good be between £1200 - £1600

Estimate for changing window to a door would be and making good be between £1600 and £2200

Hope this helps

Doug · Answer

You will need to install a door to the rear not just consider it 
You would be looking at around £2000 for the first part and about the same for the second total of around £4000 if I’ve read it right

Craig · Answer

Without looking I would allow a rough cost of about £2500-£4000

Jurgen · Answer

Removing the back door, bricking it up halfway, and installing a new window
Brickwork & plastering: £500–£1,000
New window (supply & installation): £400–£800
Labour (builder & window fitter): £500–£1,000
Total estimated cost: £1,400–£2,800
2. Converting a living room window into a single back door
Structural work (cutting the wall and installing lintels if required): £500–£1,000
New door (supply & installation): £700–£1,500 (cost varies based on material and design)
Labour (builder & door fitter): £500–£1,000
Total estimated cost: £1,700–£3,500
Additional Considerations:
If structural reinforcements (such as lintels or support beams) are required, this could add £300–£800.
Building regulations approval may be required, particularly for structural changes, with application fees ranging from £200–£500.
If the property is in a conservation area or listed, additional permissions may be needed, which could increase costs.

Change back door to a window

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