Asking for "a price for new windows" is the quickest way to end up with three quotes you cannot compare. One firm prices the whole house, another prices the front elevation only, a third assumes you are happy with whatever glass comes as standard. All three numbers look different, and none of them tells you much.
Didcot makes that worse than most towns, because the housing stock is so mixed. A Victorian terrace near the station, a 1960s semi, a Ladygrove house from the nineties and a Great Western Park plot built in the last decade all want different things from a replacement window. Here is how to run the process properly, from working out what you actually need through to reading the quote line by line. The same approach works for replacement doors and bifolds.
Step by step: getting a quote worth comparing
Step 1: Walk the house and write down what is actually wrong
Go room by room with a notepad. Record which windows mist up between the panes, which ones are stiff or will not lock, where you can feel draughts around the frame, and where the sealant has pulled away from the brickwork.
This matters because misting usually points to a failed sealed unit, which may be repairable without changing the frame, while rotten timber or a frame that has dropped out of square is more often a replacement job. Knowing the difference stops you paying for a full replacement where a repair might do, and stops you spending on repairs to frames that are near the end of their life.
Step 2: Check whether anything restricts what you can fit
Most of Didcot is straightforward. Properties on Ladygrove or Great Western Park are usually unrestricted. Older cottages in the surrounding villages, East Hagbourne or Long Wittenham for example, can sit in a conservation area, and a few are listed. Planning controls in those cases can affect frame material, sightlines and opening style.
If you are unsure, South Oxfordshire District Council holds the conservation area maps for Didcot and the villages around it. A quick check before you book surveys is better than finding out after the frames are ordered.
Step 3: Decide roughly what you want, not exactly
You do not need to arrive at a final specification on your own. You do need an opinion on a few things, because they change the price and the look:
Frame material. UPVC and aluminium both get used widely in Oxfordshire homes. Aluminium tends to allow slimmer sightlines and more glass for the same opening, while UPVC is often chosen on cost. Dynasty Windows supplies and installs both.
Opening style. Which windows need to open, and how far. Think about cleaning access on first floor windows and whether any bedroom window is your escape route in a fire.
Colour and finish. Woodgrain foils, dual colour frames and non standard RAL colours can affect lead times and price compared with standard white.
Step 4: Understand the Building Regulations before anyone quotes
Replacement windows in an existing home in England are notifiable work under the Building Regulations. As things stand in 2026, Approved Document L sets the minimum thermal standards for replacement windows and doors, so a compliant installer should be specifying glass and frames that meet them rather than whatever is cheapest.
Two other points come up constantly on survey:
Ventilation. Approved Document F generally expects existing trickle vents to be replaced like for like, and in many cases vents will need to be added. If a quote is silent on trickle vents, ask.
Safety and escape. Approved Document K covers where toughened or laminated glass is needed, typically low level glazing and glass near doors. Approved Document B covers escape windows in habitable rooms. These are specification decisions, not extras to be haggled over.
Work can be signed off either through building control or by an installer registered with a competent person scheme such as FENSA. Ask each firm how the certificate for your job will be issued, and who issues it.
Step 5: Book the survey and be in for it
A proper survey is not a salesman with a tape measure. Expect questions about how each room is used, where condensation appears, how you want the windows to open, and what access there is for taking old frames out. A rear elevation on a terraced street with no side access is a different job to a detached house with a driveway, and the surveyor should be looking at that.
Have ready: your list from step one, any paperwork for previous glazing work, and a rough idea of whether you are doing the whole house at once or working elevation by elevation. If you are planning other work, a new kitchen, a rear extension, a bifold set onto the garden, say so at the survey rather than later.
Step 6: Read the quote properly
A quote you can actually compare should make clear:
- Which openings are included, described room by room or by elevation
- Frame material, colour and profile
- Glass specification, including toughened or laminated where required, and the thermal rating
- Trickle vents, handles, hinges and locking specification
- Removal and disposal of the old frames and glass
- Making good internally and externally, and whether that includes plastering, sills or decorating
- How the work will be certified
If any of those lines is missing, the number at the bottom is not really a price yet. Ask for it in writing before you compare.
Step 7: Compare like for like, then decide
Lay the quotes side by side and check the specifications match before you look at the totals. If one is noticeably cheaper, find the reason: fewer openings, thinner glass, no making good, no disposal, standard colour only. Sometimes the reason is fine. Sometimes it explains the gap entirely.
Common pitfalls
Ordering before you have checked conservation status. Forgetting that one upstairs bedroom window may need to meet escape requirements. Accepting a quote that says "supply and fit" with no detail underneath it. And assuming every installer is registered with a competent person scheme, which is worth confirming rather than presuming.
Ready to get a price?
If you want a specification you can actually read and compare, Dynasty Windows quotes for window and door work across Didcot, Oxford and the wider Oxfordshire area. Call 07861 927 272 or get in touch to arrange a survey.
Common questions
Do I need building control approval for replacement windows in Didcot?
Replacement windows in an existing home in England are notifiable under the Building Regulations. The work can either be notified to building control at South Oxfordshire District Council, or self-certified by an installer registered with a competent person scheme. Ask at the survey how certification will be handled for your job and who will issue the paperwork.
Can I replace just one or two windows rather than the whole house?
Yes. Dynasty Windows covers anything from a single replacement window through to a full glazing system. Doing a house in stages is common, though it is worth agreeing the frame colour and profile at the start so later phases match what you have already had fitted.
Are trickle vents compulsory on new windows?
Approved Document F generally expects existing trickle vents to be replaced on a like for like basis, and in many cases vents will need to be provided where the room's ventilation would otherwise be reduced. A good survey will confirm what your particular rooms need rather than leaving it off the quote.
What should I have ready before a window survey?
A room by room note of what is wrong with each window, any paperwork from previous glazing work, your thoughts on frame material and colour, and details of any other work planned for the property. It makes the survey faster and the quote more accurate.
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