Glazing
Heritage Slim Double Glazing
Slim-profile sealed units let you double glaze a period sash or Georgian bar window without fattening the glazing bars.
If you have been quoted for heritage slim double glazing in the UK and the price looked suspiciously round, it was almost certainly a standard size with a filler piece. We do not work that way.
What you get with our heritage slim double glazing
- End-grain sealed at every cut before assembly — the single detail that decides whether joinery rots.
- Glazing beaded internally, so the sealed units can be replaced without disturbing the external finish.
- FSC-certified hardwood with documented chain of custody, available on request for planning submissions.
- Engineered laminated sections on anything over 1.2m, which resist bowing far better than solid stock.
- End-grain sealed at every cut before assembly — the single detail that decides whether joinery rots.
How we price heritage slim double glazing
The guide range above assumes a typical domestic unit in Idigbo with argon-filled double glazing and a factory-painted finish. The variables that move the number most are, in order: overall size, timber species, glazing specification and finish. Access and making good come next.
| Variable | Effect on price |
|---|---|
| Timber species | Idigbo baseline · Sapele +7% · Accoya +24% · European oak +38% |
| Glazing | Double baseline · heritage slim +13% · triple +19% |
| Finish | Primed only −8% · factory painted baseline · stained or oiled +4% |
| Quantity | 2–4 units −3% · 5–9 units −6% · 10+ units −10% |
Lead times for your area are typically six to ten weeks from approved drawings, depending on timber and finish. Repairs are usually much quicker.
Frequently asked
Free survey
Slim Glazing — measured, priced and drawn before anything is made.
Not sure on budget?
The guide price tool gives you a realistic range for heritage slim double glazing in under two minutes.
Get an indicative priceCan you fit trickle vents?
Where Building Regulations require background ventilation, we design it into the head of the frame at manufacture. That looks far better and performs far better than a vent drilled through a finished frame on site.
Do you work on listed buildings?
Regularly. Listed building consent turns on detail — sightlines, glazing bar sections, opening method and glass type. We survey the existing joinery, record the profiles and produce drawings you can submit. We will not quote a detail we know will not pass.
How much maintenance do they need?
Far less than people expect. Wash the frames twice a year, inspect the finish annually, and expect to recoat exposed elevations every eight to ten years. Sheltered elevations often go considerably longer. Modern micro-porous coatings are a different product entirely from the gloss paints that gave timber its reputation.
Which hardwood should I choose?
It depends on the finish. For painted work, Idigbo and Accoya are excellent — stable, even-grained and superb paint substrates. For a stained or oiled finish where the grain is meant to show, European oak and Sapele are the usual choices. We will recommend a species at survey based on your finish and exposure.
What is Accoya and is it worth the premium?
Accoya is timber that has been acetylated — chemically modified so it no longer absorbs water. It barely moves, does not rot, and carries a 50-year above-ground warranty. It is the single best paint substrate available. For exposed elevations and coastal sites the premium usually pays for itself.
How do the surveys and quotations work?
The guide price tool gives you an indicative range in a couple of minutes. If that range works, we book a free survey — measurements, profiles, exposure, access — and issue a fixed written quotation with a drawing. Nothing is manufactured until you have approved that drawing.
The process
How a heritage slim double glazing order runs
Get an indicative price
Use the guide price tool or send a photo and rough sizes. You get a realistic range in minutes.
Free measured survey
We measure the openings, record existing profiles and check exposure, access and cill condition.
Fixed quote and drawing
A written price and a section drawing. Nothing is manufactured until you approve it.
Manufacture and install
Made, finished and cured in the workshop, then fitted by our own team with making good included.
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Heritage Slim Double Glazing by county
Local guide prices, lead times and installation coverage.
Get an indicative price in two minutes
Use the guide price tool for a realistic range, then book a free measured survey to firm it up. No obligation either way.