How to Verify a Window Contractor’s Legal Name and UEN

A contractor’s name on a quotation isn’t proof of approval. For new aluminium window installation or replacement in an HDB flat, the work must be done by a BCA-approved window contractor listed in HDB’s Directory of Renovation Contractors. BCA registration under workhead RW01 and HDB directory listing are separate requirements for regulated window work in an HDB flat.

A business name or claim of approval is not enough on its own. To verify a bca approved window contractor in Singapore, match the contractor’s legal business name and UEN to the relevant records, then confirm that the required approval and listing apply to your work.

This guide explains what a window contractor does in Singapore and how BCA registration differs from HDB listing. You’ll learn which records to check, why the legal name and UEN matter, and how approval requirements apply to window work in an HDB flat.

Contractor verification and documentation

Check the contractor’s identity before agreeing to window work. Start with the legal business name and UEN on the quotation, then compare them with the details in the relevant BCA or HDB records. A trading name may differ from a registered legal name. If the quotation uses a trading name, make sure the documents clearly link it to the business responsible for the work.

Next, match the listing to the work you need. A directory entry does not, by itself, describe every service or project detail. For an HDB flat, confirm that the listing belongs to the business named in your documents. Keep the listing details with the quotation so you have a clear reference if the contractor’s name appears differently on later paperwork.

Before work begins, keep written records that identify the parties and describe the job. Check that the quotation and agreed scope name the same business. If a quotation uses one name but the work documents use another, have the relationship between the names recorded clearly before proceeding. Keep copies of the agreed scope, project approvals and completion documents.

After window works are completed, the contractor or builder must submit the certificate of completion no later than 14 days after completion of window works. Owners should retain the completion paperwork with the quotation and work records. This creates a straightforward record of who carried out the job, what work was agreed, and when it was completed. It also helps distinguish the contractor’s submission from documents supplied directly to the owner.

• Before work: compare the legal name and UEN across the quotation and directory entry.
• Before work: keep the written scope and any project approvals with your records.
• After work: retain the completion certificate and related paperwork.

For aluminium window work, make sure the records describe the specific job. A window replacement quotation should not be confused with paperwork for a different repair or project. If the business name changes between the listing, quotation and completion documents, resolve the discrepancy in writing. Clear records help identify the responsible party and track the project from agreement to completion.

Good documentation does not replace an approval check. It links the contractor’s identity to the work being done. For an HDB project, use that link to confirm that the business named in the agreement is the one in the relevant contractor listing. This identity check is a practical part of choosing a bca approved window contractor, not just an administrative detail.

BCA and HDB contractor credentials

In Singapore, BCA registration and HDB directory listing serve different purposes for window contractors. For work in an HDB flat, both credentials matter when the applicable requirements call for them.

BCA and HDB Credential Roles

BCA registration under workhead RW01 identifies contractors registered for window-related work, while HDB’s Directory of Renovation Contractors lists contractors eligible to carry out renovation or window works in HDB flats. These are separate records, not interchangeable approvals. Owners should match the contractor’s business identity against each relevant listing, rather than treating one credential as proof of both.

The distinction is practical. New aluminium window installation or replacement in an HDB flat must be done by a BCA-approved contractor listed in HDB’s directory. A contractor may meet one requirement but still need to meet the other for this work. BCA registration relates to the contractor’s workhead, while the HDB directory concerns carrying out work in HDB flats.

Meaning of BCA Approval

For window work, BCA approval is tied to the contractor’s relevant registration and the use of trained window installers. A trained window installer must be certified by BCA to carry out window works. BCA’s window-safety guidance also calls for approved contractors and trained installers for window replacement and retrofitting.

This matters because a company’s general renovation credentials do not automatically establish eligibility for regulated window work. In the same way that commercial property owners engage specialized contractors such as myairflow.sg for additions and alterations (A&A) like kitchen exhaust systems, residential owners must verify that a contractor holds the exact trade registration needed. Check the RW01 workhead and the HDB listing against the exact business engaged. A trained installer’s certification is a separate part of the picture from the company’s registration.

The BCA online directory displayed 281 RW01 window contractors when checked on 28 July 2026. The directory is a practical starting point, but the number alone does not establish that a particular contractor is listed or meets HDB’s separate requirements. Search by the business details used in the quotation, then compare the result with the HDB directory entry.

HDB’s terms for approved window contractors listed with HDB require a minimum three-month warranty for replaced parts and a one-year warranty for total window replacement. These terms distinguish replacing parts from replacing the entire window. When reviewing an agreement, compare the described work with the relevant warranty category so the paperwork reflects the actual job.

Use the credentials together, not as substitutes:

• Match the contractor to BCA workhead RW01.
• For HDB window work, check its HDB directory listing too.
• Confirm the arrangement includes a BCA-certified trained window installer.
• Compare the written warranty with the scope of replacement work.

To compare contractor entries, use a BCA window contractor list as a reference while confirming each credential separately.

Checking a contractor’s legal name and UEN

Use the legal business name and UEN together to match the contractor’s records. The quotation, BCA directory entry, HDB listing and project paperwork should point to the same business. A similar trading name alone does not establish that two records belong to one contractor. Compare the details before agreeing to installation work.

Start with the quotation. Find the business name and UEN, then compare both with the BCA entry for workhead RW01. For an HDB flat, compare them with the contractor’s HDB directory listing as well. Look at the whole entry, not just a familiar word in the name. A shared term such as “Window” can appear in different business names.

Check each detail carefully:

• Legal name: Compare the full name, including words that distinguish one entity from another.
• UEN: Match the complete identifier shown on the quotation with the relevant directory records.
• Workhead: For window contractor credentials, look for RW01 in the BCA record.
• HDB listing: For work in an HDB flat, compare the business identity with HDB’s directory entry.

Then compare the records with the agreement and any invoice or completion paperwork. For example, if the quotation names “Example Windows” but the directory result names “Example Windows Pte. Ltd.”, don’t assume the difference is harmless. Match the UEN and business details across the documents. If the paperwork uses another name, have the connection between the names recorded before work proceeds.

A mismatch may result from a shortened trading name, a spelling difference or paperwork issued under another business. These differences matter because a directory entry applies to the business identified in that record. A similar name does not transfer BCA registration or HDB listing to a separate entity. Use the UEN to distinguish businesses with similar names, and the full name to make the result clear.

Keep a copy of the checked records with the signed scope. This makes it easier to compare the agreed contractor with the business responsible for installation. It also gives owners a reference if the name on later documents differs. For window work in an HDB flat, retain both the BCA RW01 details and HDB listing alongside the agreement.

Before approving the paperwork, confirm that the quotation, directory records and agreement show the same legal name and UEN. Treat BCA registration and HDB listing as separate checks. Matching the identity links those credentials to the contractor named for the job, rather than to a business with a similar name.

Finding approved window contractors

For an HDB flat, new aluminium window installation or replacement must be carried out by a BCA-approved contractor listed in HDB’s directory. Singapore’s window-safety rules also apply to private properties, and BCA guidance calls for approved contractors and trained installers for replacement and retrofitting.

For an unsafe or unauthorised installation, record the property address, the issue you observed and any contractor details. Report it through the relevant official channel, contacting BCA about window-safety concerns and HDB when the property is an HDB flat.

Start your search in BCA’s online directory. Look for contractors registered under workhead RW01, which relates to window work. A general renovation listing or a company name appearing in search results does not establish RW01 registration. Open the directory record and note the registered business identity and workhead before comparing potential contractors.

For an HDB project, search HDB’s Directory of Renovation Contractors separately. HDB requires contractors carrying out window or renovation work in its flats to be listed there. BCA registration and HDB listing are separate requirements, so a result in one directory does not replace the other. Check both records for the business you plan to engage.

Use the planned work to decide which directory checks apply. An HDB flat requiring new aluminium windows needs both checks. For replacement or retrofitting in a private property, BCA’s window-safety guidance is relevant; the HDB directory requirement applies to HDB flats. This distinction helps owners avoid treating an HDB listing as universal approval for every property type.

Window safety also depends on who carries out the work. A trained window installer must be certified by BCA to perform window works. The contractor’s registration and the installer’s certification are different credentials. Keep both in mind when assessing how a proposed installation will be carried out.

When comparing search results, focus on the exact business and project, not just a claim of approval. A useful shortlist records the BCA RW01 entry, the HDB directory result when the flat is an HDB property, and whether the work involves replacement or retrofitting. This makes it easier to distinguish a contractor qualified for the project from a business with a similar name or a different scope.

If you suspect a problem, keep your report factual. Describe what appears unsafe or unauthorised, include the property type and provide the contractor’s name if available. Avoid approaching or handling an unstable window. BCA and HDB run window-safety campaigns in Singapore, highlighting the importance of qualified installation and safe window conditions.

What does BCA approval mean for window contractors in Singapore?

BCA approval links window work to registered contractors and trained installers. In Singapore, the applicable window-safety rules include the Building Control (Window Safety) Regulations. Approval matters because window replacement and retrofitting must meet safety requirements, not simply fit the opening’s dimensions.

BCA’s window-safety guidance states that replacement and retrofitting require approved contractors and trained window installers. A trained installer must be certified by BCA to carry out window works. These are related but distinct roles: registration applies to the contractor, while certification applies to the installer doing the work. A contractor’s status alone does not identify who will perform the installation.

This distinction matters during project planning. Understand whether the proposed job is a repair, replacement or retrofitting, because the work method and applicable safety requirements can differ. For example, retrofitting may involve existing window components rather than a complete new installation. The contractor’s approval should apply to the actual scope, and a trained, certified installer should carry out the installation.

Retrofitting has specific hardware requirements. In Singapore, aluminium rivets at variable geometry stays must be replaced with type 304 stainless steel rivets complying with BS EN 10088 or an equivalent standard. This requirement concerns the rivets used at those stays. It illustrates why window safety is not established by a contractor’s name alone: the materials and method used for the work matter too.

Safety barriers also affect window projects. A barrier is required to prevent a person falling from height where there is a vertical drop of 1,000 millimeters or more. The requirement focuses on the fall risk at the opening. A contractor assessing the work must account for the window and any integrated safety barrier, rather than treating the frame as an isolated component.

There is a specific route for standardised designs. Replacing or reinstating safety barriers integrated with windows using standardised designs is considered insignificant building works. Owners do not need to hire a Professional Engineer or obtain plan approval and a permit from the Commissioner of Building Control for that work. The Module on Replacement and Reinstatement of Safety Barriers Integrated with Windows took effect in Singapore on 1 March 2023.

After the work, the contractor or builder must submit the certificate of completion no later than 14 days after completion of window works. Keep the completion paperwork with the agreed scope. It connects the installation to the work performed and provides a clear record of the project’s completion.

A ACME Design: window retrofitting

A ACME Design provides window retrofitting for owners considering work on existing windows. Retrofitting may suit a project that upgrades existing window components rather than replacing the entire window. The appropriate scope depends on the window’s condition and the work required.

A ACME Design is a BCA-registered and HDB-licensed contractor in Singapore. For HDB window work, match the contractor’s business details against the relevant directory records and ensure the proposed scope meets applicable requirements. This connects the approval checks to the work planned.

If your project involves existing windows, explore A ACME Design’s window retrofitting service. You can also visit acmedesignsg.com to contact A ACME Design.

Set the Scope Before Your Next Step

Before arranging window work, identify what needs attention: a specific fault, existing windows that may need upgrading or a separate glass issue. A clear description keeps the proposed work focused and helps you discuss the right next step with a bca approved window contractor.

A ACME Design provides window repair and retrofitting, as well as shower screen repair for damaged screens. Choose the service that matches the issue, then share the relevant details when you get in touch. A practical starting point is to describe which part needs attention and whether the work concerns an existing window or a shower screen.

Contact A ACME Design to discuss your window repair, retrofitting, or shower screen repair needs. With a defined scope and a clear conversation, you can move forward with greater confidence.

Frequently Asked Questions

Who counts as a window contractor or builder?

A window contractor or builder is the business engaged to carry out window work, such as installation, replacement or retrofitting. The contractor’s role differs from the trained installer’s. The business arranges and undertakes the project, while a trained installer performs window work. For example, a quotation may name the contracting business, while project records identify the people carrying out the installation.

Can any contractor replace windows in an HDB flat?

No. New aluminium window installation or replacement in an HDB flat must be carried out by a BCA-approved window contractor listed in HDB’s Directory of Renovation Contractors. General renovation experience does not replace these requirements. A contractor listed for other renovation work still needs the relevant window credentials for this project.

How do I verify a contractor is genuinely approved?

Compare the contractor’s full business name and UEN on its quotation with the relevant directory records. For HDB window work, check both the BCA record under workhead RW01 and HDB’s directory listing. A name that looks similar isn’t enough to establish a match. Keep the records with the project paperwork so you can refer to the same business identity later.

What happens if I hire a non-approved contractor?

Window work that fails to meet Singapore’s requirements can lead to a fine of up to S$5,000 and imprisonment of up to six months. The consequences relate to non-compliance, not simply to a contractor’s label. Before work starts, identify the required credentials for your property and project, then make sure the business engaged and the work arrangement meet those requirements.

What warranty applies to work by an HDB-listed contractor?

HDB’s terms require a minimum three-month warranty for replaced parts and a one-year warranty for total window replacement. These cover different scopes of work: replacing a component is not the same as replacing the whole window. Read the job description alongside the warranty terms to confirm that the stated coverage corresponds to the work agreed for your flat.

When does Singapore window work need a BCA-approved contractor?

BCA’s window safety guidance requires approved contractors and trained installers for window replacement and retrofitting in Singapore. For an HDB flat, new aluminium window installation or replacement must also be done by a contractor listed in HDB’s directory. The project type and property determine which credentials apply, so distinguish work on an existing window from a full replacement.

Who counts as a trained window installer?

A trained window installer is certified by BCA to carry out window works. To be eligible to attend the Safety of Windows training course, a person must have at least 12 months of practical experience in window installation. This qualification applies to the installer doing the work, not just the company named on the quotation. The contractor’s registration and installer’s certification are separate credentials.

How can I check whether a window contractor is BCA-registered or approved?

Look for the business in BCA’s online directory and check whether its entry shows workhead RW01. For a project in an HDB flat, also check HDB’s Directory of Renovation Contractors. “Registered” and “approved” can refer to different requirements, so assess each record against the work planned. A BCA entry alone doesn’t establish an HDB directory listing.