Double-glazed
timber sash
windows.
Slim-line sealed units fitted into period-correct timber profiles — modern thermal and acoustic performance without giving up the proportions of the original sash.
Six reasons London
homes upgrade the glass.
-
01
Heat retention
Up to 70% less heat loss vs. 4mm single glazing.
-
02
Quiet rooms
36 dB Rw acoustic rating — bus routes feel suburban.
-
03
Lower bills
Typical first-year saving of £180 — £340 per home.
-
04
No condensation
Sealed units eliminate winter morning fog — no more rotted cills.
-
05
Period look
11 — 14mm slim cavity preserves the original glazing-bar shadow line.
-
06
Conservation OK
Approved for most London conservation areas as like-for-like.
Five layers,
one sealed unit.
-
01
Outer pane
4mm Pilkington toughened, optional self-cleaning.
-
02
Cavity gas
Argon standard · krypton on listed jobs.
-
03
Low-e coating
Pilkington K · soft-coat selective.
-
04
Warm-edge spacer
Polymer hybrid — eliminates cold-bridge condensation.
-
05
Inner pane
4mm Optiwhite for clarity, or laminated for security.
Common questions about
double glazed.
No. We use slim-line 11–14mm sealed units that fit the original glazing-bar profile. From three metres away the elevation is indistinguishable from the original.
Sometimes — it depends on the grading and the local conservation officer. We submit the application as part of the survey at no extra cost.
Most clients see a measurable reduction in the first heating season. Typical saving on a four-bed terrace is £180 — £340 in year one.
Our sealed units carry a 10-year guarantee against seal failure. Warm-edge spacers virtually eliminate the cold-bridge that causes premature failure.
Free survey,
fixed quote.
Tell us about the property and we will come back within one working day with a window count, indicative price and the next available survey slot.
London NW10 7XF
+ M25 corridor