Double glazing quotes in Harrow

Harrow installers quote for whole-house replacements, single bays, glass-only units and repairs from one enquiry:

• Replacement windows in uPVC, aluminium or timber for 1930s semis and terraces;
• Bay windows priced on their own line, with matched leaded or stained top lights;
• Timber windows and repairs for listed homes and Article 4 frontages;
• Sealed units to replace misted panes in sound frames;
• Repairs to hinges, handles, locks and seals.

Ask the installer whether a front door can go on the same quote.

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Most Harrow window quotes are for an inter-war semi. 51.8% of the borough's properties were built between 1919 and 1939, the highest share of any London borough, and 37.1% of households live in a semi-detached house.

Fewer than one in three Harrow homes built from 1930 to 1982 reach EPC band C, so the rating of the new windows carries more weight here than across most of London. Put these points to every installer:

• The bay: a separate price for each bay, and whether the quote includes support for the bay head.
• The top lights: how leaded or stained glass in the upper panes will be copied or kept.
• The rating: replacement windows must reach a U-value of 1.4 W/m²K or Window Energy Rating band B (Approved Document L, Table 4.2), so ask for the figure for each window.

A like-for-like swap is a different job from a new or enlarged bay. Check planning permission for windows before the survey if you plan to change the shape.

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A listed Harrow home needs listed building consent before any window change, and the council expects timber repairs. Harrow has over 300 listed building entries and 909 locally listed buildings.

The council's listed buildings page says: "You need consent for any internal or external changes that affect special interest. It is the Council that decides if consent is needed. Failure to consent in advance is a criminal offence." It also expects "timber for window and door repairs", and states: "We do not offer grants to the public for developments."

• Ask for a repair price and a secondary glazing price before any replacement price.
• Ask whether the installer has handled listed building consent in Harrow before.
• For original sashes, compare the routes under sash window replacement.

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Check a Harrow firm on a public register, on Companies House and on paper before it measures up. London Trading Standards "strongly advises residents never to deal with cold callers on your doorstep", so work only with installers you contacted.

1. Look the firm up on the FENSA or CERTASS register, which lets it self-certify replacement windows.
2. Confirm on Companies House that the company named on the quote is active, and when it was set up.
3. For a Pinner or Stanmore frontage, ask for the planning reference of a past Harrow job.
4. Get the insurance-backed guarantee in writing, with the insurer's name.

If you sign at home, you usually have at least 14 days to cancel, but made-to-measure windows can be an exception, so check the contract before you sign. The double glazing cooling off period guide explains the rules, and our page on double glazing installers has the full checklist.