FSI & feasibility calculator
Permissible FSI, rehab & sale area, rent, corpus and feasibility — DCPR 33(7) & 33(7B)+20(B).
Free tools & guides for Mumbai housing societies
Society redevelopment in Mumbai, without the guesswork
Understand your plot's FSI potential, follow the Section 79A process step by step, and check what a fair developer offer looks like — before your society signs anything.
- Free for society members
- Mumbai-specific (DCPR 2034)
- No account needed
Free redevelopment tools
What can your society check before negotiating?
Every tool is free, Mumbai-specific and built for society members, committees and brokers. New tools are launching one by one.
Feasibility calculator
See whether redevelopment is viable for your plot, members and location.
Additional free area calculator
Estimate how much extra carpet area members can reasonably expect.
Rent comparison tool
Compare the rent a developer offers with actual market rents across 177 Mumbai localities.
Offer comparison tool
Score up to four developer offers and see which is strongest overall.
Free offer review
Send us your developer's offer — we review it and reply in 5–10 days, free.
Corpus fund calculator
Calculate a fair corpus per sq.ft — and see whether it covers your new building's maintenance.
Carpet vs built-up converter
Convert between carpet, built-up, super built-up and RERA carpet — in sq.ft and sq.m.
Who's behind this site
Built by V21 Group's redevelopment team
This portal is run by the redevelopment desk of V21 Group — a real estate, construction and project-finance group operating across five cities. The free tools and guidance come from people who structure, fund and deliver society redevelopment every day.
8 yrs
Group track record
₹4000 Cr+
Real-estate sales value
3 Mn
Sq.ft construction delivered
3 Mn+
Sq.ft under development
The process
How does society redevelopment work in Mumbai?
Six stages, from the first committee meeting to your new home — with free tools to help you at each step.
- Feasibility studyCheck plot area, FSI potential and member expectations before anything else.
- 79A meeting & tenderPass a redevelopment resolution and invite developer offers the legal way.
- Compare offersEvaluate area, corpus, rent, track record and bank guarantees side by side.
- Development agreementNegotiate and register the DA and PAAA with proper legal review.
- Transit & constructionMembers shift on rent while approvals, demolition and construction proceed.
- Possession & corpusGet your new flat with OC, corpus payout and a new society structure.
For society members & committees
Planning redevelopment? Start prepared.
- Free calculators to understand your plot's real potential
- Neutral offer comparison — including offers we have nothing to do with
- Plain-language guides to 79A, DCPR 2034 and bye-laws
For brokers & consultants
Know a society ready for redevelopment?
- Refer societies and stay involved in the deal
- Use our tools in your own client conversations
- Transparent, professional process from day one
Knowledge hub
Guides written for members, not lawyers
Everything your general body will ask, answered in plain language.
79A process, step by step
The legal way to select a developer — meetings, tenders, consents and timelines.
DCPR 2034 explained
FSI, fungible area, TDR and incentive rules that decide what your plot can get.
Society regulations & bye-laws
Consents, quorums and committee duties during redevelopment.
Checklists & downloads
Document checklists for every stage — from feasibility to possession.
FAQ & glossary
Corpus, hardship compensation, IOD, CC, OC — every term decoded.
More free resources
Everything a society needs, in one place
Beyond calculators and guides — documents, news, learning and expert help, all free.
Download center
Tender formats, resolution templates, checklists and meeting kits.
Redevelopment news
Government GRs, court judgments, DCPR amendments and MHADA updates.
Free expert services
Offer reviews, feasibility reports, tender checks and consultations.
Learning academy
Short lessons that turn a willing committee into a confident one.
Before & after gallery
Real Mumbai societies — photos from ageing building to new tower.
मराठी पोर्टल
संपूर्ण पुनर्विकास मार्गदर्शन — लवकरच सोप्या मराठी भाषेत.
Common questions
Society redevelopment FAQs
What is society redevelopment?
Society redevelopment is the process where a housing society's old building is demolished and rebuilt, usually by a developer, using the additional FSI (floor space index) available under Mumbai's DCPR 2034 rules. In exchange, existing members typically receive a larger new flat, a corpus fund, and rent for temporary accommodation during construction.
What is the Section 79A process for redevelopment in Maharashtra?
Section 79A of the Maharashtra Cooperative Societies Act lays down government directives that housing societies must follow for redevelopment: appointing a project management consultant, preparing a feasibility report, inviting tenders from developers, and selecting a developer in a special general body meeting with the required member consent — usually in the presence of a registrar's representative. Read our full 79A guide.
How much extra carpet area do members get in Mumbai redevelopment?
There is no fixed rule. The extra carpet area depends on the plot size, location, road width, available FSI and TDR under DCPR 2034, and market rates in the locality. Offers in Mumbai commonly range from around 15% to 40% additional carpet area — but every society should verify what its own plot can support with our FSI calculator before comparing developer offers.
What is a corpus fund in redevelopment?
A corpus fund is a lump-sum amount a developer pays to the society or to individual members as part of a redevelopment deal. It is meant to offset the higher maintenance and outgoings of the new building so that existing members are not financially burdened after redevelopment.
Do society members have to pay anything for redevelopment?
In a typical builder-led redevelopment in Mumbai, members do not pay for construction. The developer funds construction, pays temporary rent, and offers a corpus — recovering costs by selling the additional flats created from the extra FSI. Members may choose to pay only if they want to buy extra area beyond what is offered free.
How long does society redevelopment take in Mumbai?
From the first feasibility study to possession of new flats, society redevelopment in Mumbai commonly takes 3 to 5 years. Timelines depend on how quickly the society completes the 79A tender process, approvals such as IOD and CC, the size of the project, and the developer's execution capability.
Talk to us about your society
Whether you're just starting discussions or already have offers on the table, we work with societies across Mumbai — from Borivali and Andheri to Ghatkopar, Mulund, Chembur and Dadar.