Loose hinges, a handle that won't close properly, draughty seals — the moment an aluminium window plays up, the first thing you do is look for a technician. But in the window repair market, everyone from the neighbourhood handyman to a full renovation firm claims to do it, quotes range from a few hundred to a few thousand dollars, and the quality and protection you get differ enormously. This article shows you how to verify a repair technician's credentials, spot quotation traps, and understand what a reasonable charge looks like — so you don't end up paying twice for a window that is still broken.
Repair Is Not Replacement: Why Choosing a Technician Matters Even More
Replacement is a one-off major job, so owners usually compare quotes and check credentials. But because repairs involve smaller sums, many owners simply grab whoever is available — and that is exactly where the trouble starts.
Repair is about judgement, not just workmanship. The same symptom, "the window is draughty", might be hardened weatherseals, oxidised hinges letting the sash sit loose against the frame, or failed sealing at the frame joints. Diagnose it wrongly and the part gets replaced while the problem stays — and the money is gone.
Repair works are regulated too. Many owners assume "it's only a part, no need to worry", but works involving the window structure must equally be carried out by a minor works contractor registered with the Buildings Department. As for whether repair or replacement is the better value, see the criteria in repair or replace your aluminium windows.
Verifying a Repair Technician: Three Things to Ask
① Registered minor works contractor number
Ask for the registration number and check it against the Buildings Department's online register. Taking Amgen as an example, licence number MWC 316/2021 can be verified at any time. A company happy for you to check the register is one worth trusting.
② Is there a real company, and insurance?
If it is purely "one technician turning up", any damage to furniture or accident during the works leaves you with no recourse. A proper company carries works insurance.
③ Which parts, and what warranty?
Parts are the easiest place to cut corners. Hinges come in different grades, and a cheap one may need replacing again within a year or two. Ask specifically for the brand and model of the parts and the warranty period, and have both written into the quotation.
5 Quotation Traps: Be Alert the Moment You See These
| Trap | What is really going on |
|---|---|
| "$XXX all inclusive" quoted over the phone | How can it be accurate without seeing the window? Charges get added item by item on arrival |
| Declaring all windows need replacing before inspecting | Inflating the job — turning a repair into a replacement |
| A quotation that just says "window repair" | No parts, quantities or steps listed, so there is no evidence in a dispute |
| Demanding you sign the same day and pay in full | Standard practice is staged payment, with the balance after completion and acceptance |
| Cannot name the part model | Usually cheap parts of unknown origin, with a short service life |
If two or three of these appear together, pause and compare another company or two. For the full method of checking out a dodgy operator, see how to check an aluminium window company blacklist.
How Is Window Repair Priced? Typical Ranges
Repair charges depend mainly on the type and number of parts, the floor, and whether scaffolding is required, and are generally priced per item rather than per window.
| Common repair item | How it is priced |
|---|---|
| Replacing hinges | Per hinge |
| Replacing handles | Per handle |
| Replacing weatherseals | Per window or per foot |
| Re-applying silicone | Per window or per foot |
| Four-Component Works (hinges + handles + inner and outer seals + silicone) | From $250 |
Watch for the minimum charge. Some companies set a minimum call-out fee, so replacing a single hinge may not be worthwhile. If there are several problems around the flat, dealing with them in one visit works out better value — for what each part actually does, see the complete guide to aluminium window accessories.
A quotation should cover: parts, labour, whether scaffolding is needed, and the warranty period. Scaffolding is the biggest variable, and most indoor repairs in fact need none.
A Real Scenario: An Owner Who Repaired the Same Window Twice
An owner in Kwun Tong had a persistently draughty bedroom window. The first time, he called a neighbourhood handyman, who glanced at it and said "just change the seal", charged a few hundred dollars and did so. Two months later, it was as draughty as ever.
The second time, an Amgen technician inspected it item by item and found that while the seal had indeed hardened, the real cause was oxidised hinges letting the sash drop so it no longer closed flush against the frame — which is why replacing the seal alone achieved nothing. The technician replaced the hinges and handle, realigned the sash, and renewed the weatherseals, resolving it completely.
The owner's conclusion: "It wasn't that the second one was expensive — it was that the first one was wasted." Which is precisely the point: an accurate diagnosis matters more than a cheap price.
Frequently Asked Questions
Does aluminium window repair have to be done by a licensed contractor?
Works involving the window structure should be carried out by a minor works contractor registered with the Buildings Department. Even for parts replacement, a licensed company offers more protection on materials, warranty and insurance. Amgen holds licence number MWC 316/2021, verifiable at any time.
How long is the warranty after a repair?
It depends on the item and the parts used. Amgen-brand 304 stainless steel hinges are tested to 50,000 open-close cycles with a service life exceeding 30 years; complete renovation waterproofing works come with a three-year warranty. Before signing, ask for the warranty scope and period to be written into the quotation.
Only one or two windows have problems — is it worth calling someone out?
Yes, and sooner rather than later. The longer oxidised hinges and loose handles are left, the more the sash drops out of alignment, until the frame itself may need attention and the cost rises instead. Dealing with it before typhoon season is the safer course.
With Window Repair, Choosing the Right Technician Is What Saves Money
The real cost of an aluminium window repair is not the figure on the quotation — it is having to repair it again. Verifying credentials, insisting on an itemised quote and confirming the warranty are the most practical ways to save. Amgen Aluminium Windows holds licence MWC 316/2021 and offers one-stop aluminium window repair, waterproofing and replacement services, with free on-site assessment across all 18 districts of Hong Kong.
For enquiries, WhatsApp us at 6586 3435 to book a technician visit with peace of mind.
