East Bengaluru buyer answers

What is undivided share (UDS) of land, and why should a flat buyer care?

By Gaurav Mongia, acre&key · Published 18 Oct 2026 · Updated 18 Oct 2026

Direct answer: Undivided share is your proportionate interest in the land and other common areas of the project, held together with every other owner and never split off as a separate piece. Under RERA, the builder must convey that proportionate title in the common areas to the association, so check how your agreement and sale deed state it.

Disclosure: acre&key’s advice is free to buyers; we are an authorised sales partner for some projects and may be paid by the developer.

Verify with your lawyer: This page explains the RERA Act and the Karnataka RERA proforma agreement as published. How UDS is recorded in your sale deed and how it works under Karnataka property law are questions for your own property lawyer. It is not legal advice.

Verify with your CA: Where this page mentions GST, it quotes the notification text only. How land or undivided share is treated in your invoice is a tax question for your CA.

When you buy a flat, you aren't only buying the space inside your walls. You're also buying a share of the land the building stands on and of everything owners use together. That share is what people call UDS. It rarely gets attention at booking, but it decides what you own in the ground beneath a tower, and it shows up in the agreement, the sale deed and later the association's records.

What does "undivided share" actually mean?

The word "undivided" is the key. Your share is a fraction of the whole, not a marked plot of land. The Karnataka RERA proforma Agreement of Sale puts it this way in clause 1.8: the allottee has exclusive ownership of the apartment and "shall also have undivided proportionate share in the Common Areas. Since the share / interest of Allottee in the Common Areas is undivided and cannot be divided or separated, the Allottee shall use the Common Areas along with other occupants" (K-RERA Proforma Agreement of Sale).

So two things sit side by side:

• Your apartment, which you own exclusively; and
• Your share of the common areas, which you own jointly with everyone else and can't fence off or sell separately.

Does the land count as a common area under RERA?

Yes. Section 2(n) of the RERA Act defines "common areas" to start with "the entire land for the real estate project or where the project is developed in phases and registration under this Act is sought for a phase, the entire land for that phase". The same definition then lists staircases, lifts and lobbies, basements, terraces, parks, play areas, open parking areas, water tanks, sumps and installations of central services, community facilities, and other portions in common use (RERA Act, s.2(n)).

That's why UDS matters. A share of the common areas is, first of all, a share of the land. If a project is registered in phases, the definition ties the land to the phase being registered, which is worth noticing when one project has several RERA numbers.

What must the builder transfer to me and to the association?

Two provisions deal with title:

1. Section 11(4)(f) requires the promoter to "execute a registered conveyance deed of the apartment… in favour of the allottee along with the undivided proportionate title in the common areas to the association of allottees or competent authority".
2. Section 17(1) repeats the duty: a registered conveyance deed in favour of the allottee "along with the undivided proportionate title in the common areas to the association of the allottees", and handover of physical possession of the apartment to you and of the common areas to the association.

Section 19(3) adds that the association is entitled to claim possession of the common areas as per the promoter's declaration filed under section 4(2)(l)(C) at registration. The Act's wording links your apartment title and the common-area title to the association. How that is reflected in a particular sale deed is one of the first things to ask your lawyer about. Our page on when a builder must hand over the association and common areas covers the handover side.

Where will I see UDS in my documents?

Look in three places:

• The agreement for sale. The K-RERA proforma's apartment schedule has columns for carpet area, exclusive common area, common area allotted to the association, undivided share and number of parking lots. Your draft may follow that layout or a different one. See what to check in the builder's sale agreement.
• The sale deed. This is the document that actually transfers title. The difference between the stages is explained in allotment letter vs agreement for sale vs sale deed.
• The project's RERA page. The registration includes the promoter's declarations and the approved plans. Checking a project on the Karnataka RERA website shows where they sit.

If the share is stated as an area or a fraction, write it down at booking and compare it at each stage. A figure that changes between the agreement and the deed without explanation is a question for the builder in writing.

How is UDS different from carpet area?

They measure different things. Carpet area, defined in section 2(k), is the usable floor area inside your apartment's walls. UDS is your fraction of the land and common areas outside it. The proforma agreement keeps them in separate columns for this reason, and clause 1.8 also says the price computation "includes recovery of price of land, construction of… the Common Areas" and other items. Our guide to carpet area vs super built-up area under RERA explains how price is meant to relate to carpet area.

Car parking is a related but separate line. Open parking areas are listed among common areas in section 2(n). See whether a builder can sell car parking separately.

Why does UDS show up in GST rules?

Because land isn't the same as construction. Notification No. 03/2019-Central Tax (Rate), in defining the "gross amount" for the affordable-housing test, counts the "amount charged for the transfer of land or undivided share of land, as the case may be including by way of lease or sub lease" alongside the construction consideration and other promoter charges. For the rates themselves, see how much GST you pay on a new flat, and take the treatment of your own invoice to your CA.

The full test is in what counts as affordable housing for 1% GST.

What questions should I ask before signing?

1. What undivided share, as an area or fraction, is attached to my apartment, and on what basis was it worked out? Ask for it in writing.
2. Does the agreement state it in the apartment schedule, and will the sale deed use the same figure?
3. Is the project registered in phases? If so, which land is part of my phase's registration?
4. Which areas are listed as common areas to be handed to the association, and which are allotted exclusively to particular flats?
5. Who will hold the common-area title, and when does the builder expect to convey it under section 17?

Keep the answers with your booking papers. They'll matter again at registration and when the association takes over. If you want a second pair of eyes on title, a consultant doesn't replace your property lawyer for the title check.

Frequently asked questions

Can I sell my undivided share of land separately from my flat?

The K-RERA proforma agreement says the share in the common areas "is undivided and cannot be divided or separated". Ask your lawyer how your own deed treats it.

Does a higher UDS mean I own a bigger plot?

No. UDS is a proportionate interest in the whole land and common areas, shared with all owners, not a separate plot you can mark out.

Is UDS the same as carpet area?

No. Carpet area under section 2(k) is the usable floor area inside your flat. UDS is your proportionate share of the land and common areas outside it.

Who gets title to the common areas under RERA?

Sections 11(4)(f) and 17(1) require the promoter to convey the undivided proportionate title in the common areas to the association of allottees or the competent authority.

Where is UDS written in my documents?

Usually in the apartment schedule of the agreement for sale and in the sale deed. The K-RERA proforma has a separate column for undivided share.

References

1. Real Estate (Regulation and Development) Act, 2016, sections 2(k), 2(n), 4(2)(l)(C), 11(4)(f), 17(1), 19(3) (K-RERA copy): https://rera.karnataka.gov.in/resources/staticpage/Real_Estate_Act.pdf, accessed 17 Oct 2026
2. Karnataka RERA, Proforma Agreement of Sale (Downloads page), clause 1.8 and apartment schedule: https://rera.karnataka.gov.in/downloadPage, accessed 17 Oct 2026
3. Notification No. 03/2019-Central Tax (Rate), 29 March 2019, definition of gross amount (GST Council copy): https://gstcouncil.gov.in/sites/default/files/2024-05/download_2024-05-17t161406.556.pdf, accessed 17 Oct 2026

This page explains public rules and processes. It isn't legal or tax advice. acre&key gives buyers advice for free. We are an authorised sales partner for some projects and may be paid by the developer.