9 Best Landed Interior Design Firms in Singapore (August 2026)

Before the list, the checks that matter most for a landed home. The first is structural capability. If your project touches the building, extending, raising the roof, moving structural walls, adding a floor, you need a firm that works with a BCA-licensed builder and, where the works require it, a qualified person such as an architect or professional engineer to endorse and submit the plans. A designer who only does flat interiors can be genuinely out of their depth here.

The second is approvals. Landed additions and alterations, and any rebuild, must comply with the planning rules set by the Urban Redevelopment Authority (URA), alongside BCA and other agency requirements. Ask a prospective firm how they handle submissions and which consultants they work with, because on a landed project that process is a big part of the job.

After that, judge them on landed portfolio fit. Look for recent projects of a similar type, terrace, semi-detached or detached, and similar scope, since a firm strong on cosmetic interiors may have never run a full A&A. Look for multi-storey and outdoor design in their work, from staircases and double-volume spaces to gardens and facades. And look for the ability to project-manage a longer, more complex build without losing control of cost and timeline. This is a shortlist to interview closely, matched to how far you are changing the house.

Landed costs span an enormous range, because the scope does. A cosmetic interior refresh is one thing, a full addition-and-alteration another, and a knock-down rebuild something else entirely. Here are the ballpark ranges I would budget for in 2026, excluding furniture, appliances and professional fees for consultants.

On top of the build cost, structural and A&A projects carry professional fees for the architect, engineer and other consultants, plus submission and approval timelines. The gap between a light interior job and a rebuild is the single biggest reason to be clear about scope before you compare quotes.

Here is the shortlist in one view, by what each firm does best for a landed home.

I favoured firms with genuine landed portfolios, the ability to run A&A and structural works properly, and, where verifiable, strong reviews and accreditation. Landed firms are often boutique or project-based, so where a public rating did not exist I said so rather than inventing one. Details were accurate when I wrote this but they move, so confirm the current picture, and the firm's builder and consultant arrangements, directly before you engage anyone. I update the list when my view changes.

An interior designer plans and delivers the interior spaces, layout, finishes, carpentry and styling. An architect handles the building itself: the structure, envelope, extensions and the statutory submissions for anything that changes the built form. For a cosmetic or interior-led landed renovation, a capable ID firm may be enough. For addition and alteration works, raising the roof or a rebuild, you need architectural input, which is why the strongest landed firms either have architecture in-house or work hand-in-glove with an architect and engineer.

A&A stands for addition and alteration: works that change or extend an existing landed building, such as adding a floor, extending the footprint, reworking the roof or altering the structure. These are not the same as interior renovation, and they require proper approvals under URA planning rules and BCA requirements, with plans submitted by a qualified person. If your project touches the building rather than just the interior, budget for the consultant fees and approval timelines, and use a firm that runs this process regularly.

For structural works and larger A&A or rebuild projects, yes, the construction should be carried out by an appropriately BCA-licensed builder. A purely cosmetic interior refresh may not require it, but the moment you are altering structure, extending or rebuilding, the builder's licensing and the involvement of a qualified person become important both for safety and for approvals. Ask any prospective firm exactly who will hold the builder responsibility on your project.

Far longer than a flat. A straightforward interior renovation might run a few months, but a major A&A can take the better part of a year or more once you include design, consultant submissions, approvals and construction. A full rebuild is a multi-year commitment. The approvals stage alone can add months before any building starts, so plan on a realistic overall timeline and treat any promise of a very quick landed turnaround with caution.