How much do A&A works cost for a landed house in Singapore?

The cost comes down to how much you are adding and whether the work is structural or only a replan of the inside. The state of the existing house matters too, along with how much has to come out and be put back, the finishes you pick, and access. A middle terrace with one narrow front is slower and dearer to work on than a detached plot a lorry can drive into. We walk the house first, then price the actual job.

Do A&A works need URA and BCA approval?

Almost always, yes. Changing the shape, size or height of the house needs planning approval from URA, and structural work needs BCA approval before anyone starts on site. Only a qualified person, meaning a registered architect or a professional engineer, can file the submissions. We bring that team in and handle the paperwork. How long approval takes depends on the authorities and how many rounds of comments come back, so we will not promise you a date.

How long do A&A works take?

Longer than most people expect, and it depends on the scope. A replan of the inside is the shorter kind of job, while a new storey or a large extension takes much longer, with design and approval time on top of the build. Approval timing is set by the authorities, not by us. We give you a proper schedule once the drawings are done, rather than a confident number on the first call.

Is A&A cheaper than tearing down and rebuilding?

Often, but not always. Extending keeps the foundations, the frame and the pipes and wiring you already have, so there is less to knock down and less to build. It can also let you keep parts of the house that a brand new build would have to give up under today's rules. Rebuilding wins when the house is in poor shape, when the layout you want means gutting it anyway, or when your plot allows a much bigger house. We compare both for your house before we quote.

Do I need to appoint an architect or engineer myself?

No. We bring in the architect and, if the work is structural, the engineer, so you do not have to go and find them. They sit inside the same contract as the build, which means the drawings and the site are not two separate conversations for you to referee. The architect still answers to the authorities independently, and that is a protection for you, not for us.

Can I add a storey or an attic to my existing landed house?

Usually, if two checks come back in your favour. First, what your estate allows, because roof shapes, attic forms and height limits differ from street to street. Second, whether your foundations and columns can carry the extra weight, because older houses were often built for the floors they already have and nothing more. The engineer checks the structure, and whether it can be strengthened, before the layout is locked in, so you are not paying to draw something the house cannot hold up.

Can I extend a terrace or semi-detached house at the rear or the side?

Yes, the back is the common move on a terrace, and the side mostly suits a semi-detached or a corner terrace. How far you can go depends on the space that must stay clear behind you, the ground level, any drain running there and what sits on the boundary. A middle terrace has shared walls on both sides, and a shared wall holds up two houses, so cutting into it affects next door too. We check the boundary and the shared walls early.

Do I need to move out while the works are running?

For structural work, usually yes. Hacking, demolition, roof work and an added storey are noisy and dusty, the power and water go off at times, and an empty house is far easier to keep safe. A replan kept to one part of the inside can sometimes be done in stages while you stay put. We tell you which one your job is at the site visit, rather than saying you can stay and then asking you to move halfway through.

Extend your home without knocking it down

A&A Works

A&A works cover everything you can do to a landed house short of a full rebuild: extend at the rear, add an attic or a storey, or open up the inside. The work needs approval before any hacking starts, so we engage the architect and the engineer and handle the paperwork with URA and BCA. We also check what the house is standing on before anything is drawn up, because the new work has to sit on walls and foundations built decades ago.

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Why Choose Us

What You Get

One Contract, One Company

We are the main contractor, not a middleman. The architect, the engineer, the trades and the site all sit under one contract with us, so you have one number to call and one company answerable for the result.

We Deal With the Authorities

A&A work needs approval before it starts, and only an architect or an engineer can file for it. We bring them in, put the drawings together, and answer whatever URA and BCA send back, so you are not the one chasing.

We Check the House First

Older landed homes hide surprises: shallow foundations, crumbling concrete, a wall shared with next door. We look at what is actually there before the design is fixed, not after demolition has started.

Detailed for the Rain

The junction between old and new is where leaks start. New roofs, extensions and openings get proper falls, flashings, gutters and waterproofing where they meet the existing house, because Singapore rain finds anything less.

Options

Materials & Systems

Concrete Frame

How most landed homes are already built. Good for an added storey, wet areas and flat roofs, as long as the extra weight is checked against your existing foundations first.

Steel Frame

Lighter than concrete and quicker to put up. Useful for a rear room or an attic, and on tight terrace plots where a crane or a lorry cannot get close.

Lightweight Walls

Light block or steel studs with cement board, for replanning rooms and for new walls upstairs. Much easier on an existing floor than brick.

Aluminium Doors and Glazing

Sliding doors, screens and roof glass for a new extension, chosen for driving rain and built with proper drainage channels rather than relying on sealant.

How It Works

Our Process

We Come and Look

We walk the house with you. We look at the structure, the roof, where your boundary runs and where the pipes and cables sit, and we get clear on what you want the house to do. Free, and you owe us nothing afterwards.

We Work Out What Is Possible

The architect checks what your plot allows and the engineer checks what your house can carry. This is also where we compare extending against rebuilding, and tell you honestly which one your house is better suited to.

We Get It Approved

The architect draws the job up and files it with URA and BCA, with the other agencies where the work pulls them in. We put the drawings together and answer whatever comes back. How long this takes is not ours to set, so we will not give you a date we cannot keep.

We Build It

We board up the site and sheet over whatever we are not touching. Then demolition and hacking, then the structure, roof and outside walls, then wiring, plumbing and aircon, then finishes. One team, one schedule, regular updates.

We Sign Off and Hand Over

The architect gets the completed work signed off with the authorities. Then we walk the house with you, list anything that needs putting right, fix it, and hand you the approved drawings and paperwork for your records.

Real people, real care

What working with us looks like

A thorough, free site assessment. We measure and plan around your home.

Careful, protected work by people who take pride in the finish.

A proper walkthrough and handover. We see it through to the end.

Common Questions

A&A Works FAQ

A&A stands for addition and alteration: any work on a landed house that stops short of tearing it down and starting again. That covers a room at the back or the side, an attic, an extra storey, a bigger car porch, and knocking through to replan the inside. You keep the house and build onto it. Keep too little of it and the authorities treat the job as a new house, with the rules that come with that.

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One accountable contractor, start to finish

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Where We Work

A&A Works anywhere in Singapore

We take on landed homes across the whole island. These are the estates we get asked about most often, each with notes on the houses and the access there.

Bukit Timah Holland Village Sentosa Cove Serangoon Gardens Watten Estate Siglap Frankel Estate Opera Estate Telok Kurau Joo Chiat East Coast Binjai Park Namly Seletar Hills Thomson

Your estate not listed? It makes no difference to us. Tell us where the house is.

Related Services

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Basement Construction

When you cannot build up or out, we build down. Excavation, structure and waterproofing for a dry, usable floor below the house.

Attic & Loft Conversion

The empty space under your roof becomes a bedroom, study or family room. Proper staircase, proper insulation, proper approvals.