Renovation Contractor
in Kajang

Local facts last reviewed 27 September 2026. Sources are listed at the end of the page.

Kajang is the administrative centre of a very large council: MPKj also covers Balakong, Bangi, Semenyih and the southern half of Cheras. Around the town itself, the N.25 Kajang state seat recorded 236,240 residents in Census 2020 and the wider P.102 Bangi parliamentary seat 687,609. The housing runs from the historic town centre with its early-twentieth-century shophouses, to Bandar Baru Bangi, a satellite town set up in 1974, and on to newer developments such as Saujana Impian, Sungai Chua, Jade Hills and Twin Palms.

That spread means one Kajang job might be a shophouse where the family lives upstairs, and the next a twenty-year-old terrace whose owners want a bigger kitchen at the back. Both come under the same council, but the approvals and the risks are different.

Kajang key facts

MPKj’s extension guideline, point by point

An MPKj application to extend a terrace, semi-detached or detached house is made through a consultant, starting with the consultant’s letter and Form A. The checklist asks for the latest paid assessment-tax bill, the owner’s IC, dated site photos taken within seven days, the Certificate of Completion and Compliance (or Form F) and the sale-and-purchase agreement with title.

• Structural drawings are required for two-storey extensions, single-storey extensions larger than 500 sq ft, and rear floor levels raised more than 2 ft.
• Party walls between houses must be solid, non-combustible, 112mm (4.5 in) thick on each side and carried 230mm above the roof.
• Light and air: openable windows, vents or grilles totalling at least 15% of the extension’s floor area; car porches and open terraces built under the guideline must stay unenclosed.
• Sanitary pipes in an extension run to a gully trap and then a manhole, never into the surface drain.

MPKj is explicit about enforcement: building differently from an approved plan without written permission can, on conviction under Act 133, bring a fine of up to RM50,000 plus RM1,000 for every day the offence continues, and owners who ignore the requirements can be ordered to modify or demolish the structure. Interior work that does not add floor area uses MPKj’s separate minor-works forms.

Kajang’s housing, from shophouses to new townships

The old town. Kajang’s centre is built around shophouses with trading floors below and family quarters above. Work on these is usually a mix of roof and wall repair, rewiring and converting the upper floor, and the older the building the more important it is to check the timber and the roof before planning finishes.

Bandar Baru Bangi and 1970s–80s estates. Predominantly freehold terrace and link housing. The classic job is the rear extension — which is exactly what MPKj’s guideline governs — along with bathroom rebuilds where the original waterproofing has reached the end of its life.

Newer townships such as Saujana Impian, Sungai Chua, Jade Hills and Twin Palms: here owners mostly ask for kitchens, built-in carpentry, grilles and awnings rather than structural work.

Sungai Jelok and Kajang’s flood history

On 14 November 2014 Sungai Jelok overflowed into Bandar Kajang, Taman Jasmin and Saujana Impian, leaving about 50cm of water. The 27 December 2021 downpour brought flash floods to Kajang as Sungai Langat reached a dangerous level; Taman Lembah Mewah flooded from rain and clogged drains, and the river near Taman West Country passed its warning level. On 8 May 2024 flash floods hit Jalan Raja Haroun, the Kajang market area, Jalan Sri Jelok and Taman Sri Reko in the town centre.

If your house is in one of those streets, raise sockets on the ground floor when rewiring, prefer tiled or cement-board finishes to plasterboard and chipboard low down, and make sure an extension does not lower the floor level or block the rear drain — MPKj’s rule that rear levels more than 2 ft higher need structural drawings is worth knowing if you plan to raise one instead.

Common Kajang renovation jobs

We have written Kajang-specific guides for the jobs asked about most:

• House renovation in Kajang — extensions and full refurbishments under the MPKj guideline.
• Bathroom renovation in Kajang — re-tiling and re-waterproofing older terrace bathrooms.
• Waterproofing in Kajang — roofs, wet areas and walls in flood- and rain-exposed homes.
• House extension costs — what a rear or side extension typically involves, before you brief a consultant.

Kajang and surrounds

We work across Kajang town, Sungai Chua, Saujana Impian, Jade Hills and the wider MPKj area.

Other MPKj areas nearby

These neighbouring pages share Kajang’s council, so the same guideline applies:

• Bangi — the 1974 satellite town of freehold terraces.
• Semenyih — fast-growing townships along the Kajang–Semenyih road.
• Sungai Long — golf-course township on Kajang’s northern edge.
• Bandar Mahkota Cheras — two-storey terrace township off the Cheras–Kajang highway.
• Balakong — former New Village with condos and landed enclaves.
• Cheras — split between DBKL, MPAJ and MPKj.

Sources & official references

The local facts on this page were checked against the sources below on 27 September 2026. Council procedures, forms and fees change — confirm the current position with the council before you start work:

• MPKj — residential extension guideline and checklist — documents, RC drawings, party walls, openings, sanitary, penalties.
• MPKj — download forms — renovation and minor-works applications.
• OpenDOSM — N.25 Kajang (Census 2020) — constituency population.
• OpenDOSM — P.102 Bangi (Census 2020) — constituency population.
• Malay Mail — Kajang floods (Nov 2014) — Sungai Jelok overflow.
• The Star — Kajang flash floods (Dec 2021) — Sungai Langat level.
• The Vibes — Kajang flood reports (Dec 2021) — Taman Lembah Mewah, Taman West Country.
• The Vibes — Kajang flash floods (May 2024) — town-centre streets.