Room by room
Loft Conversion Secondary Glazing
A room that overheats in July and cannot be kept warm in January, with rain noise on top is the reason most people fit secondary glazing in this room. The trapped air layer damps both directions of heat flow, which flattens the daily swing rather than just adding warmth. We cover South Yorkshire, North Derbyshire and the surrounding towns.
Listed-building drawings and specifications are prepared free with the quote where consent is needed.
Quotes are written, itemised per opening, and hold for 60 days.
Thermal figures quoted are whole-window, not centre-pane, which is the honest way to state them.
Measured performance figures come from our own post-install testing, not manufacturer maximums.
What makes this room different
Loft rooms have the highest surface-to-volume ratio in the house, so glazing improvements show up faster there than on any other floor.
Gable-end windows on exposed hillside plots take the full wind load, and compression seals matter more than glass thickness in that situation.
Where a loft has been converted under permitted development the original opening is often non-standard; every unit is templated rather than ordered to a stock size.
Is there enough depth in a dormer reveal? Usually yes, and where there is not we face-fix a slim unit to the plaster line — it costs no more and the sightline is barely different.
The technical answer
| Typical opening | dormer casements, gable-end sashes or large steel-frame openings in mill conversions |
|---|---|
| Glass specification | Low-E glass for the thermal swing, upgraded to laminated where the gable faces a road |
| Operation | restricted headroom means we usually set the unit into the reveal face rather than the reveal depth |
| Main benefit | the trapped air layer damps both directions of heat flow, which flattens the daily swing rather than just adding warmth |
From enquiry to install
- Step 1
Send a photo and rough dimensions for an indicative price within a working day.
- Step 2
On-site survey and templating of the opening.
- Step 3
Manufacture, typically two to three weeks.
- Step 4
Room-side install with no external access required.
Recent installs nearby
Kelham Island loft conversion
Four large steel-frame factory openings sealed with slim satin-anodised horizontal sliders. Post-install U-value 1.87 W/m²K.
Bennetthorpe villa Low-E retrofit
Full ground-floor sash retrofit with Low-E secondary sliders — gas usage down 22% over the following heating season.
Edgerton stone-mullioned villa
Whole-house retrofit of hinged secondary units behind original mullioned casements. U-value 1.94 W/m²K on tested rooms.
This room, town by town
- Loft glazing in SheffieldSouth Yorkshire
- Loft glazing in RotherhamSouth Yorkshire
- Loft glazing in DoncasterSouth Yorkshire
- Loft glazing in BarnsleySouth Yorkshire
- Loft glazing in ChesterfieldDerbyshire
- Loft glazing in WorksopNottinghamshire
- Loft glazing in WakefieldWest Yorkshire
- Loft glazing in HuddersfieldWest Yorkshire
Local areas we cover for this room
- Ranmoor (S10)wealthy 19th-century industrialists' villas on tree-lined avenues
- Meersbrook (S8)family terraces on the slope up to Meersbrook Park
- Stannington (S6)elevated village overlooking the Loxley Valley
- Whirlow (S11)stone-built green-belt fringe on the Peak District boundary
- Handsworth (S13)old village centre absorbed into the east of the city
- Grenoside (S35)hilltop stone village on the northern city boundary
- Loxley (S6)steep-sided valley settlement north-west of the city
- Arbourthorne (S2)interwar estate on a ridge south-east of the centre
- Parson Cross (S5)very large interwar estate on the northern plateau
Other rooms
- Bedroom glazingsleep through road, rail and neighbour noise
- Living room glazingmake the main reception room usable in winter and quiet enough for conversation
- Home office glazingtake calls without background traffic and keep the room warm on a working day
- Nursery glazingprotect daytime naps and keep a small room at a stable temperature
- Bathroom glazingstop condensation, mould and cold surfaces in the wettest room in the house
- Kitchen glazingcut condensation over the sink and keep a hard-surfaced room from feeling cold
- Dining room glazingmake a rarely-heated room comfortable and quiet enough to eat and talk in
- Stairwell glazingclose the biggest uncontrolled heat path in a period house and protect stained glass
- Garden room glazingextend the usable season of a room that is currently too cold or too loud to sit in
Common questions
Will it help with summer overheating in a loft?
It reduces the swing in both directions. The trapped air layer slows heat gain as well as heat loss, though solar shading on a south-facing dormer still does more in midsummer.
Is there room in a dormer reveal?
In most conversions yes. Where the reveal is shallow we face-fix a slim profile to the plaster line instead of setting it into the depth.
Does it quieten rain noise?
On the glazing, yes. Rain striking the roof covering itself is a separate path and will not change.
Talk it through first
Five minutes on the phone is usually enough to know whether this is the right fix.
Loft glazing — the short version
Fix the hottest-in-summer, coldest-in-winter room and the noise that comes straight off the roofline, using Low-E glass for the thermal swing, upgraded to laminated where the gable faces a road. Restricted headroom means we usually set the unit into the reveal face rather than the reveal depth.