Guide to Renovating Old Flats in Salt Lake

Salt Lake's wide avenues and generous apartment sizes made it one of Kolkata's most desirable addresses in the 1980s and 90s, and it still is today, but almost every flat in Sectors I through V is now carrying three decades of wear inside its walls. When clients come to us with a Salt Lake property, we almost never treat it as a simple cosmetic job, because doing so would be a mistake that costs them money twice.

What a 30-Plus Year Old Flat Actually Needs Before You Touch the Walls

The first thing we tell every Salt Lake client is this: the work that nobody photographs is the work that determines whether your renovation lasts ten years or one monsoon season. Older apartments in Bidhannagar were built with materials and systems that were perfectly adequate for 1990 but are genuinely inadequate now.

The three non-negotiable items we address before any interior finishes:

• GI pipe replacement. Galvanised iron pipes were the standard through the 80s and 90s. After 30 years, they corrode from the inside, restrict water pressure and shed rust into the supply line. We replace them entirely with CPVC for hot water lines and UPVC for cold supply, and we do not patch around them.
• Full electrical rewire. A flat wired in the 90s was designed for one or two air conditioners at most, along with basic lighting and a geyser. Today the same flat might need four ACs, a modular kitchen full of appliances, a home theatre and EV charging. The old distribution board simply cannot carry that load safely. A complete rewire with a new MCB panel and proper earthing is standard on every project we do here.
• Chemical waterproofing. Kolkata gets roughly 1,600 mm of rainfall a year and most of it falls in four months. Walls in older flats hold that moisture like a sponge. We use crystalline waterproofing compounds on external-facing walls and a two-coat polymer treatment on bathroom slabs before any tiling begins. Skipping this step and then wondering why paint is peeling eighteen months later is something we see far too often in Salt Lake.

The Realistic Cost Breakdown for Salt Lake Renovation in 2026

We get asked about budgets at every initial consultation, so here is an honest picture of what different scopes cost in Salt Lake right now. These are indicative ranges based on our own projects completed in 2025 and early 2026, for a 1,200 to 1,800 sqft flat.

The conservative estimates assume standard materials from reputable brands. The premium column reflects imported hardware, custom millwork and designer lighting. Most of our Salt Lake projects land somewhere in between, and we always give clients a detailed scope document before any work begins so there are no surprises mid-project.

Rethinking the Floor Plan for How Families Actually Live Now

The layouts of 80s and 90s Salt Lake flats were designed around a very particular idea of domestic life, with a closed kitchen tucked away at the back, a formal dining room that rarely got used, and long corridors that eat into usable area. We spend a lot of time at the planning stage asking clients how they actually live, not how they think they should live.

The most common changes we make:

• Opening the kitchen to the dining area. Non-load-bearing walls between the kitchen and dining room come down in nearly every project we do. The result is more light, better airflow and a space where cooking and conversation happen in the same room instead of in isolation.
• Borrowing from corridors. Salt Lake flats from that era often have 4 to 5 feet wide internal passages that lead nowhere in particular. Redistributing that area into the master bathroom or a second bedroom gives you a meaningful gain in usable space without touching any structural walls.
• Replacing wooden window frames. Heavy, swelling teak or sal wood frames were everywhere in buildings of that era. We replace them with UPVC or powder-coated aluminium systems that are weatherproof, require no maintenance and genuinely improve both light and acoustic comfort, particularly for flats on the main roads of Salt Lake.

Dealing with the BMC and Debris: the Part No One Tells You About

Renovating in Salt Lake means working within the jurisdiction of Bidhannagar Municipal Corporation, and heavy civil work comes with real regulatory and logistical considerations that first-time renovators often underestimate.

The biggest practical headache is debris. When you knock out walls, rip up old mosaic flooring and strip three decades of ceiling plaster, you generate a considerable volume of concrete rubble and old material. Salt Lake's streets are clean and closely managed, and dumping debris on the road even temporarily draws fines from the BMC. Every project we manage includes a logistics plan for debris: municipal-approved dumpsters positioned with proper permission, timed removal so rubble does not sit overnight and coordination with the building's maintenance committee when elevator access or stairwell use is involved.

We also strongly recommend a pre-renovation conversation with your building committee and immediate neighbours. Heavy civil work in an occupied building is disruptive by nature, and a brief notice explaining the schedule and duration goes a long way toward keeping relations cordial through the project.

Preserving the Character: Terrazzo Floors and Other Hidden Gems

One of the things we genuinely enjoy about working in older Salt Lake flats is what we find once the furniture is moved out. Terrazzo, or mosaic flooring, was almost universal in buildings of the 80s and early 90s, and it was made well. The aggregates were set properly and the thickness is typically 25 mm or more.

Rather than covering it or demolishing it, we restore it. Diamond grinding followed by three or four passes of mechanical polishing brings the surface back to a rich, smooth finish that looks deliberately curated rather than old. A sealed terrazzo floor in a warm tone pairs beautifully with contemporary furniture and natural wood accents, and it is genuinely more durable than most modern tiles at a fraction of the replacement cost.

Other elements we look for and try to retain: solid teak door frames (which we restore and repaint rather than replace), high ceilings that give us the depth to incorporate a proper false ceiling with concealed lighting, and the proportions of the rooms themselves, which in a Salt Lake flat from that era are often genuinely generous by modern standards.

Material and Finish Choices That Work in Kolkata's Climate

This matters more than most clients realise at the start of a project. Kolkata runs at high humidity through most of the year, and the wrong materials will show it within a season. Our recommendations based on ten-plus years of projects in the city:

• For kitchen shutters, pre-laminated MDF or membrane-pressed boards hold up better than raw MDF or PVC in a humid kitchen. We avoid high-gloss acrylic in kitchens where there is heavy daily cooking, because it shows grease and micro-scratches.
• For bathroom walls, large-format vitrified tiles with minimal grout joints mean less surface area for mould to colonise. We seal grout on installation and recommend a reapplication every two to three years.
• For flooring in living areas, engineered wood or SPC vinyl plank gives the warmth of wood without the swelling risk that real hardwood carries in a Kolkata monsoon. If the terrazzo is in good condition, we almost always advocate for keeping it.
• For false ceilings, gypsum board is our standard. It handles humidity better than plain POP and takes paint consistently across a large surface.

Working with a Studio Versus Managing It Yourself

We know some clients consider running a renovation themselves by hiring individual contractors for civil, carpentry and painting work separately. It can work, but it carries real risks that are worth naming clearly.

The coordination tax on a full renovation across multiple independent contractors is substantial, and it tends to fall hardest during the critical transition between civil work and finishes, which is exactly when precision matters most.

How We Approach a Salt Lake Project from Day One

Our process begins with a site visit where we do a full structural walk-through, note the location of load-bearing walls and columns, assess the existing plumbing and electrical systems, check for active dampness and map the natural light through the day. That first visit is free of charge and without any commitment, because we would rather give you an honest picture of what the project involves before you decide whether to work with us.

From there we produce a scope document that separates civil work from interior design from furnishing, so you can make decisions at each stage based on your actual budget rather than a single blended number. We have completed well over a hundred residential projects across Kolkata since 2014, and a significant portion of those have been in Salt Lake and New Town, which means we know the material suppliers, the BMC processes and the building committees in this part of the city well.

If your Salt Lake flat is due for a serious renovation and you want to talk through the scope honestly and without sales pressure, reach out to us at Studio Contour. We are happy to walk through the flat with you, tell you what we would prioritise, and give you a realistic picture of what it takes to do this well.