How to Rewire and Replumb an Old House Without Regret

Start With a Survey, Not a Guess

Before any design is finalised, have a licensed electrician and a plumber go through the house. They should check the age and type of wiring, the condition of the distribution board, whether earthing exists, and where water lines and drains actually run. Old houses often have additions and patch jobs that no drawing records.

Plan Electrical Around How You Live

Rewiring is the best moment to think about how the house is really used. Where will the television sit, where does the desk go, and which rooms need air conditioning? Separate circuits for heavy loads such as air conditioners, geysers and the kitchen keep the system safe and stop one appliance from tripping everything else. Add more sockets than feels necessary, especially in the kitchen and by the bed.

Concealed conduit is neater than surface wiring but means opening walls, which is why it should be coordinated with any plaster and paint work rather than done separately.

Plan Plumbing Around the Bathrooms and Kitchen

Replacing old galvanised pipes with modern CPVC or PPR lines is common in renovations. The main decisions are where the new lines run, how wall-mounted fittings and concealed cisterns fit in, and whether a bathroom layout is being changed. Moving a toilet or a drain point is far more involved than moving a tap, because drainage relies on gravity and slope.

Pressure-test new lines before tiling. It is a small step that saves you from discovering a leak after the floor is finished.

Keep a Record Before the Walls Close

Photograph every wall with the pipes and conduits visible, and keep a simple sketch showing where they run. Years later, when you want to hang a heavy cabinet or drill for a shelf, that record is worth a great deal.

Choosing Materials That Will Outlast the Renovation

For wiring, ask your electrician about copper conductors from reputable makers, properly sized for each circuit, with separate lines for heavy appliances such as air conditioners, geysers and induction hobs. Modular switches are the visible part; the wire, the miniature circuit breakers and the earthing are the parts that keep you safe, so put the care there first.

For water lines, the choice between CPVC and PPR, and the fittings used, matters as much as the pipe itself. Good joints, proper clamping and sensible routing away from heat sources make the system last. Ask what is being used, why, and what the installer's warranty covers.

Bangalore Specifics: Borewell, Sump and Mixed Water

Many homes here run on a mix of Cauvery supply, borewell water and tanker top-ups, with a sump and overhead tank in between. Rethinking the plumbing is a good moment to check where the tank and pump sit, whether hard borewell water needs a softener or filter line, and whether a separate supply for washing and flushing is worth planning.

Old drainage deserves the same attention. Slopes that have settled, cracked stack pipes and choked gullies cause slow drains and odours long after the tiles are new. Ask for the drainage lines to be flushed and inspected before the bathrooms are closed up.

Working Alongside the Other Trades

Electrical and plumbing work must be sequenced with carpentry, false ceilings and tiling. Points for wall lights, chimneys, geysers and appliances should be fixed against the final drawings, not guessed. Every change made after the walls are chased and plastered costs more and looks worse, so use a marked-up layout and have everyone sign off on it before cutting begins.

Do the invisible work first, and do it properly. Everything you can see later depends on it.