House Extension Contractor
in KL & Selangor

House extensions in KL & Selangor: what we build

Families extend for a handful of reasons: a cramped wet kitchen, a parent moving in, a home office, or simply more bedrooms than the house was sold with. The requests we see most often are a bigger kitchen at the back of a terrace, a side room on a semi-D or corner lot, a car porch turned into a room, and a whole new floor on a single-storey house. Each one is a different kind of job, with different structure underneath it.

We design and build the extension and the renovation that goes with it, so the new room and the old house are planned together: where the walls open, how the floor levels meet, where the roof joins and how the wiring and plumbing are carried through. If the job is mainly about the rooms inside the existing walls, our renovation service page covers that work.

Typical extensions by property type

What can be added depends mostly on the land around the house and on what the original structure was built to carry. The table is a planning guide, not a fixed scope; the council and your engineer have the final say.

Rear and kitchen extensions

The rear extension is the job most terrace owners have in mind, usually to hold a proper wet kitchen behind a dry one. The first question is not the layout but the land: on many older rows the back fence, apron or an earlier extension already runs up to the drain, yet the drain and the back lane are rarely part of your lot. Building over them is not something a later application can fix.

Inside your own lot, the rules on open space decide how much of the yard can be covered, and the drain beside it affects the footings. The rear kitchen extension guide walks through the boundary, the drainage and the approval route. If you only want shelter for drying and washing, compare a roof cover with a full room in the roof cover vs extension guide.

Adding an upper floor

Going up turns a single-storey house into a double-storey one without buying land, but it is the heaviest change a house can take. The roof has to come off, a new floor structure goes over the existing rooms, a staircase takes space downstairs, and every pipe and cable for the new rooms is carried up from below. Bathrooms upstairs need careful waterproofing, because a leak there ends up in the ceiling of the room under it.

None of that starts until an engineer has confirmed in writing that the columns and footings can carry the extra load, or has designed new ones. The guide to adding a second storey covers the structure, the neighbours and the disruption, and the single vs double-storey renovation guide explains how a two-floor house behaves differently afterwards.

Side extensions and enclosed car porches

On a semi-D, corner terrace or bungalow, the open side of the lot is the obvious place for a new room. How wide it can be is set by the side setback, and the room has to borrow light from its own windows so the old rooms behind it do not turn dark. Where the new roof meets the old wall is the detail that decides whether the room stays dry.

Turning the car porch into a study or a bedroom feels like a small job because the roof is already there, but it still adds enclosed floor area, and the porch normally sits in the front setback that councils keep open. The guide to enclosing a car porch explains when it can be approved and when it cannot.

Council approval and who draws the plans

This part is general advice, and it applies to every builder. An extension is building work, so the council approves the plans before construction begins. The drawings are prepared and endorsed by a registered architect, or by a registered draughtsman for minor works where the council accepts one, and anything that carries load also needs a professional engineer. The owner signs the application and carries the liability, and the contractor builds to the approved drawings.

Who may sign what differs between councils, so confirm the scope before paying for drawings; the guide to architects, draughtsmen and engineers sets out each role. The renovation permit guide lists which works need approval, and the guide to building without a permit explains what an unapproved extension can mean when you later sell or refinance.

Foundations, structure and the join to the old house

The most common extension problem in Malaysian terrace houses is not collapse but a crack that opens where the new room meets the original house. It happens when the two parts settle differently, for example when the old house stands on piles and the extension sits on shallow footings over filled ground. The fix is in the design, not the plaster: an engineer decides from the ground conditions whether the new part needs piles, how it ties in, or whether a deliberate movement joint is the better answer.

Soft or filled land, a drain close to the new wall and an older house with unknown footings all push that decision. The piling and foundations guide explains the options and why the engineer, not the builder, chooses between them.

Extend, renovate or rebuild?

Sometimes an extension is the wrong answer. If the existing structure is failing, the layout fights the family and most walls would move anyway, rebuilding can be the more sensible route; if the frame is sound and only the services are tired, a renovation with a modest extension usually wins. We renovate, extend and also demolish and rebuild. The demolish, rebuild or renovate guide lists the signs that point each way.

What your extension quote should show

An extension quote has more moving parts than an interior renovation, so read it line by line. Look for the footings or piling to the engineer's design, the structure and slab, brickwork and plaster, the roof and its flashing to the old roof, waterproofing of wet areas, doors and windows, wiring and plumbing extended from the house, tiling and finishes, debris removal and making good the existing rooms. Consultant and council fees are usually separate from the building work, so check which side of the line they fall on.

Comparing two builders by the total alone hides what each one left out; the guide to reading a renovation quote shows how to line them up. A good contractor fixes the price for the agreed scope and, when the ground or the old structure turns up a surprise, stops and explains it before carrying on. Our price is flat for the agreed scope, with no hidden charges.

Choosing an extension builder

Ask any builder to show recent extension work, a written scope and the order in which the job will run. Larger structural jobs may need a CIDB-registered contractor; the CIDB contractor guide explains how registration works. The guide to choosing a renovation contractor lists the other questions worth asking before a deposit changes hands.

Areas we cover

We build extensions across Kuala Lumpur, Selangor and Putrajaya, on terraces, semi-Ds, bungalows and single-storey homes. Each council runs its own approval process, so look at the local notes for Kuala Lumpur (DBKL), Shah Alam (MBSA) and Putrajaya (PPJ). The full list of towns is on the areas we serve page.