Lisen Builders Pte. Ltd. is a builder based at 2 Kallang Avenue, #08-13 CT HUB, Singapore 339407, and holds a 5.0 rating on Google. Its web listing runs through the Building and Construction Authority's contractor directory (entry 200908964M).
In Singapore the first check is paperwork: the BCA's register lists licensed builders along with the grades and work scopes each is approved for. Structural jobs — opening up a shophouse interior, adding a storey to a terrace — need permits and a Qualified Person's sign-off, and a good builder raises this while quoting, not after. Regulars ask for itemised quotes, milestone-linked payments and addresses of finished jobs nearby. It helps that the CT HUB blocks around Kallang Avenue are home to plenty of building and design firms, so comparing two or three is easy.
For Kallang households and businesses gathering quotes, a 5.0-rated builder with a BCA-listed record upstairs at CT HUB is a sensible name to start with.