My Answer with regards to your Question:
Check with HDB DIRECTLY TO DOUBLE CONFIRM BELOW:
You May need to go through a licensed renovation contractor. Here's the process:
Engage a Licensed Renovation Contractor:
Find a contractor registered under the HDB Registered Renovation Contractor (RRC) scheme (https://services2.hdb.gov.sg/webapp/BN31AWERRCMobile/BN31PContractorResult.jsp).
Discuss your dual-key concept design with the contractor and ensure they understand HDB regulations for renovations.
Contractor Submits Plans:
Your chosen contractor will prepare the necessary renovation plans based on your dual-key concept and HDB guidelines.
They will submit the plans to HDB for approval on your behalf.
HDB Review and Approval:
HDB will review the plans against their regulations for safety, structural integrity, and compliance with dual-key unit requirements.
The approval process can take several weeks.
Commence Renovation (After Approval):
Once HDB grants approval, you can proceed with the renovation works with your chosen contractor.
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