Is double glazing worth doing before you sell in Berwick? What it adds, and what it does not
Straight answer: a whole-house retrofit at $18,000 to $35,000 will not come back dollar for dollar in a six week campaign. What does pay is fixing the three window defects that buyers and building inspectors write down: fogged units at $660 to $1,300 each, a door or slider that will not lock at $180 to $450, and cracked or non-compliant glass in doors and low panels at $350 to $700 a panel. Spend $1,500 to $4,000 there, not $25,000 on the lot.
Every window job, what it costs, what it does at sale, and our verdict
This is the table we would talk through standing in your kitchen. Costs are 2026 fitted prices for a typical Berwick brick veneer. The value column is deliberately written as what the job protects rather than what it adds, because protecting a price is the honest way to describe most pre-sale work.
| The job | 2026 cost | What it realistically adds or protects | Verdict |
|---|---|---|---|
| Replace 2 to 4 fogged double glazed units | $1,300 - $5,200 | Removes the most visible defect in the house and the matching line in the building report | DO IT |
| Service and realign the sliding door, new rollers and lock | $260 - $830 | Stops the door that sticks at every inspection, which reads as a neglected house | DO IT |
| Grade A safety glass into a door or a low side panel | $350 - $700 per panel | Closes a genuine safety item that inspectors flag and buyers use to negotiate | DO IT |
| Clear weep holes, replace perished seals, reseal sills | $180 - $400 | Stops the water staining under a window that every buyer reads as a leaking roof | DO IT |
| Replace broken or missing flyscreens | $60 - $140 each | Pure presentation. Cheap, quick, and noticed on a walk through | ONLY IF several are torn |
| Repair rotten timber sills properly | $350 - $900 per sill | Inspectors probe sills with a screwdriver. Filler and paint fails that test in one second | DO IT |
| Acoustic glazing to front facing rooms only | $2,000 - $4,000 | Answers the traffic noise objection on an arterial frontage, where that is the reason offers stall | ONLY IF on a main road |
| Whole-house double glazing retrofit | $18,000 - $35,000 | Real comfort and energy gains, but not recovered inside a six week campaign | SKIP IT unless staying 3 years |
| Replace sound mill-finish aluminium frames for looks | $15,000+ | Buyers do not price frame finish. They price kitchens, bathrooms and land | SKIP IT |
| uPVC replacement across a period Berwick home | $20,000 - $40,000 | Can work against you with buyers who came for the character, and heritage controls may apply | SKIP IT |
| Tint or stick-on film to make windows look uniform | $40 - $120 per window | Looks cheap up close, can void an insulated unit warranty, and comes up in inspections | SKIP IT |
| Professional glass and track clean before photography | $180 - $450 whole house | The highest return per dollar on this entire list. Photographs and light change | DO IT |
2026 fitted prices for a typical Berwick or Beaconsfield brick veneer. Verdicts assume a normal sale campaign, not a renovation you plan to live in.
Want the short list for your house before the photographer books?
We walk the house, price only what changes the outcome, and tell you what to leave alone. Free, and there is no pressure to do all of it.
Buyers see three things at a window, and inspectors see five
Buyers walking a Berwick open home are not measuring U-values. In the twelve seconds they spend at each window they register whether it is clean, whether it opens smoothly when they try the handle, and whether the view is clear or milky. That is the whole list. A fogged unit fails all three at once, which is why it is the single most damaging window defect in a sale.
A building inspector is looking harder, and their report is what buyers use to negotiate. A pre-purchase inspection is a visual report written to the Australian Standard for pre-purchase property inspections, and on windows it reliably picks up:
- Failed insulated units. Written up as a defect with a recommendation to get a glazier to investigate, which buyers read as an unknown cost.
- Cracked glass and glass that is not safety glass in doors, side panels and low openings. This one gets flagged as a safety issue, not a cosmetic one.
- Rot and moisture in timber sills and reveals. They press a screwdriver into the bottom corner. Filler and fresh paint over soft timber is found immediately and it costs you credibility on everything else in the house.
- Water staining below sills and mould around reveals. Often only blocked weep holes at $180 to $400 to fix, but in a report it sits next to the word moisture and buyers assume roof or wall.
- Windows painted shut and locks that do not work. Small money, but it lands in the report as poor maintenance, and that phrase is worth more discount than the repair.
The rule of thumb that holds up
Buyers discount an unknown by far more than it costs to fix. A fogged unit that would cost you $850 to replace routinely turns into a $3,000 to $5,000 line in an offer, because the buyer has no idea whether it is one window or the whole house. Removing unknowns before the campaign is the entire strategy.
When to fix it and when to put it on the table
The decision is not about honesty against strategy, because in Victoria you have to be honest anyway. A vendor statement has to disclose prescribed matters including building permits issued in the past seven years, and Consumer Affairs Victoria guidance on material facts expects a known serious defect to be disclosed rather than hidden. Painting over rot is not clever, it is the thing that unravels a settlement.
The workable rule is this. Fix anything under about $1,500 that is visible, because you will lose more than that in the negotiation. Fix anything that is a safety item, because a buyer who learns about it later has a real grievance. Disclose and price anything structural: a window wall that needs reframing, a bay window with movement in it, or a second storey opening that needs scaffold. Get a written quote for the big items and hand it to the agent, because a buyer with a real number stops imagining a bigger one.
What to ask any glazier quoting pre-sale work
- What is the lead time on the glass, in business days, and is any of it toughened, obscure or laminated?
- Is the quote per opening, and does it include the make good on the reveal, the paint line and the rubbish?
- What glass specification are you fitting, and is it the same as what came out?
- Will you write me a one page statement of the work done, that I can hand a buyer?
- What happens if the frame is worse than it looks once the glass is out, and how is that priced?
A good quote is itemised per opening with the glass type spelled out. A cheap quote is one line and one number, and the missing detail is usually the frame repair that turns up on the day. There is a full breakdown of what things should cost on the pricing page, and a longer read on what separates the two kinds of job on the DIY against professional page.
How long the work needs before the campaign starts
Work backwards from photography day, not from auction day. From your first call, allow about 7 days to get a measured written quote. Standard clear and Low-E insulated units are made to your dimensions and come back in 5 to 15 business days. Toughened, obscure and acoustic laminated units run 3 to 6 weeks. Install is 1 to 3 days for a few openings. That means six to eight weeks before photography for anything involving new glass, and two weeks if all you are doing is hardware, seals and a clean.
Two Berwick specific timing notes. First, June to August is the busiest stretch for window work in the South East because that is when people notice the cold, so build in an extra week if you are selling in spring. Second, if you are doing anything that touches energy efficiency and want to check current rebate eligibility, that paperwork is handled at the measure and should not delay the job. There is a seasonal breakdown on the best time of year to double glaze.
Two jobs we would tell you not to bother with
The first is replacing sound aluminium frames because they look dated. Frames in good condition are not what buyers price, and $15,000 spent there disappears without trace in the result. Clean them, replace the perished rubbers for $180 to $400, and put the rest of the money into presentation that photographs.
The second is a whole-house double glazing retrofit purely to sell. If you are moving in eight weeks, the comfort benefit goes to somebody else and the market will not hand back $25,000 for it. The people who should do a full retrofit are the ones staying three years or more, and for them the case is comfort and running costs rather than resale. If that is you after all, start with retrofit into existing frames and how long double glazing lasts.
Once the house is sold and you are staying put somewhere else, the schedule that keeps new glazing performing is on our window maintenance schedule, and if something breaks mid campaign, the emergency triage table will tell you whether it needs fixing before Saturday. What we cover locally is on the Berwick page.
Questions sellers and agents ask
Does double glazing add value when you sell in Berwick?
What window jobs are actually worth doing before a sale?
Will a building inspector pick up a failed double glazed unit?
How far before the campaign do I need to start?
Should I fix the problem or disclose it?
Is acoustic glazing worth it on a main road property?
Get the pre-sale window short list, priced
Tell us your campaign date and we come out, walk the house and send a priced list split into do it, optional and leave it, usually within 2 business days.
Selling in Berwick? Get the honest short list first
We will tell you which windows to fix, which to leave, and what each one is worth doing. Berwick, Beaconsfield, Officer, Narre Warren and the rest of the South East.