Choose replacement windows for the property
Frame material changes the look and upkeep of the finished windows. uPVC, timber and aluminium can each be suitable, but the right choice also depends on the existing frontage, opening style and any property-specific restrictions. Note whether you need casement, sash or another configuration, and whether the proposed units preserve the appearance you value. For each opening, check dimensions, glazing specification, ventilation, handles and security features. A simple “double glazing” label does not tell you enough to compare two offers.
Compare double glazing prices on the same scope
Ask every double glazing company to price the same number of openings and the same level of finish. The proposal should identify frames and glass, removal of old units, making good around the reveals, trims, sealing and disposal. If one installer includes scaffolding or difficult access while another does not, the totals are not comparable. Find out what happens if measurements change at survey stage. Ask who will fit the windows, how the work will be protected from weather and what paperwork you receive at completion.
Check installation and approval before ordering
In England, replacement windows can require building-regulations compliance. GOV.UK describes competent-person schemes that can self-certify eligible work and provide a compliance certificate; another approval route may be needed if the installer is not registered for that work. Planning and conservation controls are a separate, address-specific question, particularly when changing the appearance of a property. Scotland and Wales have their own requirements, so check the relevant local authority rather than assuming one UK-wide rule. Resolving these points before ordering can prevent a good-looking quote becoming an awkward project later.
Check the GOV.UK competent-person scheme guidance for England for the cited England-specific rules.
Explore double glazing companies and replacement windows, then get replacement window prices for your property. If drainage around the roofline also needs work, the guttering installation guide can help define a separate scope.