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Film on Federation leadlight: what to ask first

A Federation front on the North Shore is rarely one kind of glass. This guide goes pane by pane: where window film usually suits, which leaded panes to leave bare, and the questions to put to council and to whoever fits the film before anything goes on.

Book a measureMark your street side
Two panes from one front, cut through. Above, a leadlight panel: the lead stands proud of the glass on both faces, so film on the room side would rest on the lead and leave air over the glass. Below, a clear sash: flat glass, with film lying flat on its inside face and stopping short of the timber. LEADLIGHT PANEL, IN SECTION STREET SIDE FILM RESTS ON THE LEAD AND LEAVES AIR UNDER IT ROOM SIDE CLEAR SASH, IN SECTION STREET SIDE FILM FLAT ON THE GLASS, SHORT OF THE TIMBER ROOM SIDE
Two panes from one front, in section

Which panes on a Federation front

A common North Shore front: a bay of double-hung sashes with leadlit upper sashes, and a front door with a fanlight and sidelights. Each numbered pane has its own answer.

A Federation street front, drawn. Numbered panes: 1, the clear lower sashes of the bay, shown filmed. 2, the leadlit upper sashes, ringed to be looked at on the measure. 3, the leadlit fanlight over the door, ringed. 4, the leadlit sidelights, ringed. 5, the glass panel in the front door. 6, the obscure bathroom window at the side, ringed. 1 2 3 4 5 6
  • Film usually suits this glass
  • Leadlight or obscure glass: looked at on the measure
  • A different question comes first

The front, pane by pane

  1. 1Front bay, lower sashes

    Clear glass, often older and thinner than modern glass. The usual place to start: low-reflective film on the room side.

  2. 2Front bay, upper sashes

    Leadlight. Looked at on the measure, and often left bare while the clear sash below takes the film.

  3. 3Fanlight over the front door

    Leadlight or coloured glass. Looked at on the measure. A small pane, and seldom where the heat comes in.

  4. 4Sidelights beside the door

    Leadlight, often textured. Looked at on the measure. If privacy is the reason, read privacy on the street side.

  5. 5Glass in the front door

    A door pane raises a safety question before a heat one. Read safety film for older glass.

  6. 6Bathroom window at the side

    Obscure glass with a pressed pattern. Looked at on the measure: some patterns are too deep for film to lie flat.

Mark your own front

Panes to leave as they are

Window film is made for flat glass. In a leadlight panel each piece of glass is held in a channel of lead that stands proud of both faces, and the glass itself is often rippled, textured or coloured. Film laid across that rests on the lead and the high points, and bridges everything else. The drawing at the top of this page shows it cut through.

So on most Federation fronts the answer is film on the clear glass and a close look at every leaded pane. Some panes are better with nothing on them at all.

A panel that bows, rattles or has cracked

Lead tires over a hundred years, and a panel can bulge in its frame or crack a piece. That is work for a leadlight restorer. Film is not a repair, and it has to come off again before the restorer can start.

Coloured glass you enjoy from inside

A tinted film behind coloured glass deepens it from the room side. If the colour thrown across the hall floor is the reason you love the house, that pane stays bare.

Leadlight that is not the problem

When the afternoon heat comes through the clear sash below, filming the leaded highlight above it adds to the quote and changes nothing you would feel in the room.

Original glass with a council question open

On a listed house, or one in a conservation area, the front glass waits until council has answered. Film at the back of the house does not have to.

What Ku-ring-gai's heritage controls say about windows

Ku-ring-gai Council lists its heritage conservation areas suburb by suburb, from Roseville and Lindfield through Killara, Gordon and Pymble to Turramurra and Wahroonga. The rules for those houses sit in Part 19 of its Development Control Plan. Two sections cover windows: 19C.5 for houses in a conservation area, and 19D.5 for heritage items.

In a conservation area the window controls apply to contributory properties. Council's definition is wider than the name suggests: it includes houses that have been altered but could reasonably be put back, and houses with additions sensitive to the original. A renovated house can still be one.

None of the Part 19 controls we read mention window film, for or against. That leaves the question with council, for your house. We can describe the film, show you a sample and write every pane down. Whether it needs approval is council's answer, never ours.

In Willoughby, North Sydney, Lane Cove, Mosman or Hornsby, your own council writes its heritage controls, and the questions further down work for any of them. To see whether an address sits in a conservation area, search it on the NSW Planning Portal spatial viewer and look at its heritage layer.

Ku-ring-gai DCP, Part 19, in council's words
19C.5, control 20“Original doors and windows to front and side elevations of contributory properties are to be retained where contributing to the significance of the property.”
19C.5, control 24“The retention, repair and restoration of original leadlight and coloured glass window and door panes is encouraged.”
19D.5, control 25The same words again, for houses listed as heritage items.
19C.5, control 25“If sound attenuation is required, double glazing fitted to existing windows is encouraged.”
Window filmNot mentioned in the Part 19 controls.

Questions to ask before you start

Before you ring anyone, note which room bothers you, at what time of day, and why: heat, glare, fading, privacy or how the front looks from the street.

Ask council

  • Is my house a heritage item, or a contributory property in a conservation area?
  • Are the front and side windows part of what makes it contributory?
  • Does film on the room side of original glass, which can be peeled off later, need consent on my house?
  • Would you like to see a film sample or the pane schedule before you answer?
  • Who should I speak to, and can I have the answer in writing?

Ask whoever fits the film

  • Will you look at every leaded pane before it goes on the quote?
  • Which film goes on the front, and how does it look from the footpath?
  • Where does the film edge finish: on the glass, or over the putty and beads?
  • How does it come off, if we or a later owner want it gone?
  • Does the quote give each pane its own line?

Ask us all five on the measure.

What film on the wrong pane costs

Film laid over the lead

It lifts along the lead lines and holds air. Getting it off means working around every line of lead in the panel.

Film before council answers

If council then says the front should not have changed, the film comes off again, and both the fitting and the removal are paid for.

A silver sheen on old glass

Reflective film shows from the street as a mirror finish across a period bay. At the front we suggest low-reflective film unless you ask for something else.

A repair hidden under film

A cracked or loose panel keeps moving under the film, and the film is in the restorer's way when the repair can no longer wait.

Questions about film and Federation leadlight

Does Ku-ring-gai's DCP say anything about window film?

Not in the Part 19 heritage controls. They deal with keeping and repairing original windows, leadlight and coloured glass. How film is treated on your house is a question to put to council.

Our house has a rear extension. Can it still be a contributory property?

It can. Council's definition takes in altered houses that could reasonably be reinstated, and houses with additions sensitive to the original. Council can tell you whether yours is one.

Is it worth filming only the clear sashes?

Often, yes. In many Federation bays the lower sashes are clear and larger than the leadlit panes above them, so film on those alone changes how the room feels on a hot afternoon, with the leadlight left untouched.

Can film hold a loose leadlight panel together?

No. Film does not repair leadlight. A loose, bowed or cracked panel goes to a leadlight restorer first, and we look at the glass around it once the repair is done.

What can I take to council?

The schedule from our measure: each pane on the front, its glass, and the film we suggest for it or that it stays bare. Ask council whether they also want to see a film sample.

Would double glazing be better?

For street noise, Ku-ring-gai's controls encourage double glazing fitted to existing windows, and that is joinery work rather than ours. For heat, glare and fading through the clear panes, film changes far less of the window.

More on period fronts

Federation houses we measure

References

  1. Ku-ring-gai Development Control Plan, Part 19: Heritage items and heritage conservation areas. Doors and windows are controls 20 to 25 of 19C.5 (conservation areas) and 21 to 25 of 19D.5 (heritage items); the definition of a contributory property is in the introduction. Read from council's published copy on 24 September 2026.
  2. Ku-ring-gai Council: Heritage conservation areas, listed by suburb.
  3. NSW Planning Portal: Spatial viewer, which shows planning and heritage layers for an address.
  4. NSW Government: Search heritage databases, including the State Heritage Inventory.