Warmer, quieter, and compliant · All 32 London boroughs
Double Glazing in London
Windows, doors, bi-folds and rooflights — including conservation-appropriate options.
Rear extension, rendered
Rendered single-storey rear extension with French doors onto a paved patioWhat we do
Replacement glazing has to meet current thermal standards, and in a conservation area it usually has to look like what it replaced as well. We supply timber, aluminium and uPVC, and we know which boroughs will refuse a uPVC unit on a front elevation.
Included as standard
- uPVC, aluminium and timber windows
- Bi-fold, sliding and French doors
- Rooflights, lanterns and Velux installation
- Conservation-style and sash replacements
- Acoustic and toughened safety glazing
- FENSA-compliant certification
- Typical timescale
- 1–5 days installation
- Coverage
- 32 boroughs
- Payment
- In arrears
- Trading since
- 2008
Thermal standards and certification
Replacement windows and doors are controlled fittings under Part L of the Building Regulations and have to meet minimum thermal performance. They must also satisfy Part F for background ventilation, Part K where glazing is in a critical location and needs to be toughened or laminated, and Part B where a window serves as a means of escape.
Compliance is demonstrated either through a competent person scheme, producing a FENSA or equivalent certificate, or through a building control application. Keep the certificate — it is another item on the conveyancing checklist.
In a conservation area, appearance is regulated as well as performance. Councils frequently refuse uPVC on a principal elevation where the original was timber sash, so the specification is set by the planning position rather than by the price list.
Escape window sizing is the requirement most often missed on a loft conversion or a bedroom replacement: the openable area and the height of the opening above floor level are both defined, and a unit that fails them has to come out again.
The limits above are the national permitted-development rules for England. Your borough may restrict them further through a conservation area or an Article 4 direction — we confirm the position for your address in writing before quoting.
Our work
Double Glazing we have completed
Answers
Double Glazing — common questions
Do I need planning permission for double glazing in London?
It depends on the property type and what is proposed. Many single-storey rear extensions and loft conversions fall under permitted development, but those rights do not apply to flats and are restricted in conservation areas or where an Article 4 direction applies. We check the planning position for your specific address before quoting, and tell you in writing which route applies.
How do you price the work?
From a site survey, written up as a fixed and itemised scope before any deposit is discussed. If something genuinely unforeseen appears once work is opened up, it is priced and agreed in writing before we continue — never added to the final invoice after the fact.
When do I pay?
In arrears of work completed. You pay for work that has been done and inspected, not for work that has been promised. This has been how the company operates since 2008.
Do you handle Party Wall notices?
Yes, where the work requires them. Under the Party Wall etc. Act 1996, notifiable work on a shared wall needs 2 months written notice to the adjoining owner, while excavation near a neighbouring structure and building at the line of junction need 1 month. We serve the notices and manage the award process as part of the job.
Will I get certificates at the end?
Yes. Electrical work is tested and certificated under Part P, and building control issues a completion certificate where an application was required. You receive the handover pack — it is what a buyer's solicitor will ask for when you eventually sell.
How long will it take?
It depends entirely on scope, and we give a programme with the written quote rather than a guess on the phone. What we will not do is start a job we cannot resource, which is the usual reason a build stalls halfway through.
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A picture and a postcode tells us more than any enquiry form. You will get a straight answer about cost and whether it needs planning permission.