A couple hunting for a two bedroom flat in the western suburbs of Mumbai in early 2026 were handed a glossy brochure with a MahaRERA number printed in small type at the bottom. On a hunch they typed that number into the official regulator website before paying the booking amount, and the project that came up carried a different tower configuration and a registration that had lapsed. The developer had reused an old number on a new advertisement. Two minutes on a public website saved them from a booking they would have regretted.

The short answer. Before you book any flat in Mumbai you should verify the project on the official MahaRERA portal, where you can search by registration number, project name, promoter name, or district. A genuine Mumbai project carries a registration number in the format P51900 followed by a unique series, and that number must appear on every advertisement, booking form, and agreement. The trade off is time versus risk: the check takes minutes, and skipping it exposes you to unregistered or lapsed projects. Under the RERA law a promoter must register a qualifying project before any marketing or sale, so a missing or mismatched number is a reason to stop.

What is a MahaRERA registration number and why does it matter?

A MahaRERA registration number is the unique identity the regulator assigns to a registered real estate project, and it is your anchor for every other check. For a Mumbai project the number follows the pattern P51900 and then a unique series, where the letter P stands for project and the digits encode the region and a unique identifier. The number matters because the Real Estate Regulation and Development Act requires qualifying projects to be registered before they are marketed or sold, and it requires the registration number to appear on advertisements, booking forms, and the agreement for sale. When a number is present and matches the portal, you can read the approved details; when it is absent, altered, or points to a different project, you have found a problem before spending money.

How do you verify a project on the MahaRERA website?

You verify it through the search project registration feature on the official MahaRERA portal, which lets you look up a project several ways. In practice you visit maharera.maharashtra.gov.in, open the registered projects search, and enter the registration number if you have it, or search by the project name, the promoter name, the district, or the promoter PAN. The record that appears shows the registered project details, the promoter, and the status, which you then compare against the brochure and booking form in your hand. The table below summarises the main ways to search and what each one confirms, drawn from a public MahaRERA verification walkthrough. Always rely on the official portal for the final answer.

What should you read once you find the project page?

Once the project page opens, read the status, the promoter details, and the approved specifics rather than only confirming the number exists. Check that the promoter name matches the party you are dealing with, that the project location and building details align with what you were shown, and that the declared completion date is realistic for the stage of construction on site. The portal also carries uploaded documents and quarterly updates for many projects, which let you see whether the developer is filing progress as required. If the flat you are being sold, its carpet area, or its tower is not reflected in the registered details, treat that gap as a question the developer must answer in writing before you proceed. Pay particular attention to the complaints section if the portal shows one, because a pattern of unresolved buyer complaints against the same promoter is useful context that no brochure will ever volunteer. Note the registered completion date as well, since a date that has already passed with the building far from ready tells you more about delivery risk than any marketing promise of possession.

Can a builder take booking money before RERA registration?

No, a promoter is not allowed to market or sell a qualifying project before it is registered, so a demand for money before registration is a red flag. Under the Real Estate Regulation and Development Act, residential and commercial projects above the prescribed size, commonly cited as more than a set land area or more than eight apartments, must be registered with the regulator before any marketing or sales activity, and selling an unregistered project is an offence. The law also limits how much advance a promoter can take before you sign a registered agreement for sale, a share commonly cited as ten percent of the cost. Because these thresholds and their exact wording can be updated, confirm the current position on the official MahaRERA portal, and never pay a token amount against a project you cannot find on the regulator website.

What does a lapsed or withdrawn registration mean for a buyer?

A lapsed or withdrawn registration means the project is not currently covered by an active MahaRERA registration, which removes an important layer of protection for a buyer. Registrations are granted for a period tied to the expected completion, and a developer is expected to renew or extend where needed. If the portal shows a status that is not active, you should pause and ask the developer for a clear explanation and proof of a valid current registration before considering the project. An active status is not a guarantee of a good outcome, but a status that is not active is a clear signal to slow down, seek documents, and if needed take legal advice. The safest posture is simple: book only against a project you can see, with an active registration, on the official portal. Keep a dated screenshot of the project page you relied on, so that your due diligence is documented if any dispute arises later.

How does RERA verification fit with your other checks?

RERA verification is the regulatory layer, and it works best alongside your title, cost, and area checks. The registration confirms that the project is on the regulator record and that the developer has made the required disclosures, but it does not replace a title review of the land, a reading of the agreement for sale, or a careful look at how carpet area is defined in your deal. A complete buyer runs all of these together: verify the project on MahaRERA, confirm the land title and approvals, understand the true carpet area you are paying for, and budget accurately for stamp duty and registration. When each of these lines up, you are buying with your eyes open rather than on trust. It helps to remember what RERA registration is and is not. It is a disclosure and accountability framework that puts project information on the public record and gives buyers a forum for complaints, which is valuable. It is not a quality certificate or a promise that the project will finish on time, so a registered project still deserves the same scrutiny of documents and site progress that you would give any large purchase.

A seven step MahaRERA check before you book

Work through these before any money changes hands.

1. Ask the developer or agent for the MahaRERA registration number in writing.
2. Open the official MahaRERA portal and search by that registration number.
3. If you do not have a number, search by project name, promoter name, or district instead.
4. Confirm the project status is active rather than lapsed or withdrawn.
5. Match the promoter name, location, and building details against your brochure and booking form.
6. Read the uploaded documents and any quarterly progress updates on the project page.
7. Refuse to pay any advance for a project you cannot find or that shows an inactive status.

Pair this regulatory check with your other Mumbai homework. Our guide to stamp duty and registration charges in Mumbai helps you budget the closing costs, and our explainer on carpet area versus built up and super built up area shows why the RERA carpet area on the project page is the figure that should anchor your price comparison.

Frequently asked questions

What is a MahaRERA registration number and where do I find it?

A MahaRERA registration number is the unique identity the regulator assigns to a registered project, and for Mumbai it follows the format P51900 with a unique series. By law it must appear on the project advertisements, booking form, and agreement for sale. Ask the developer for it in writing, then verify it on the official MahaRERA portal before you book.

How do I verify a project on the MahaRERA website?

Visit the official MahaRERA portal and open the registered projects search. Enter the registration number if you have it, or search by project name, promoter name, district, or promoter PAN. Compare the project status, promoter, and details on the portal against the brochure and booking form you were given before paying any amount.

Can a builder take booking money before RERA registration?

No, a promoter cannot market or sell a qualifying project before it is registered, so money demanded before registration is a warning sign. The law also caps advance collection before a registered agreement for sale, commonly cited as ten percent. Confirm the current rules on the official portal and never pay for a project you cannot find there.

What does a lapsed MahaRERA registration mean?

A lapsed or withdrawn registration means the project is not currently covered by an active registration, which removes an important protection for buyers. Ask the developer for an explanation and proof of a valid current registration before proceeding. An inactive status is a clear signal to slow down, seek documents, and if needed take legal advice before booking.

Last updated 2026-07-18. PropNewz Team.