Undivided share of land: what it means for an apartment buyer

1.4.1 What is an undivided share of land?

Undivided share of land, or UDS, is a flat owner’s proportionate interest in the land on which the apartment project stands. The share is “undivided” because the owner does not get a marked portion of the site. All flat owners hold the whole land together, each in a stated proportion. The Real Estate (Regulation and Development) Act, 2016 (RERA) supports this model. Section 2(n)(i) lists “the entire land for the real estate project” as a common area. For a phase registered on its own, it is “the entire land for that phase”. Section 17(1) makes the builder execute a registered conveyance deed for your flat. The same section requires “the undivided proportionate title in the common areas” to go to the association of allottees. The Karnataka Apartment Ownership Act, 1972 also counts “the land on which the building is located” as a common area. That applies unless the Declaration says otherwise. So when you buy a flat, you buy the flat plus a share in land that nobody can fence off.

The Karnataka Apartment Ownership Act, 1972 adds two rules that protect the share. Section 6(2) says the share cannot be separated from the apartment. The share passes with the flat, even if a deed does not mention it. Section 6(3) says the common areas “shall remain undivided”. No owner can sue for partition unless the property is removed from the Act. Both rules apply only to a property that is under the 1972 Act, as the next section explains.

1.4.2 How is UDS calculated in Karnataka today?

In Karnataka today, the formula depends on whether the project is under the Karnataka Apartment Ownership Act, 1972. Section 2 says the Act “applies only to property” whose owners submit it to the Act by “executing and registering a Declaration”. Section 6(1) then sets the formula. Each owner gets the “percentage expressed in the Declaration”. That percentage is computed “by taking as a basis the value of the apartment in relation to the value of the property”. So under the 1972 Act, UDS follows value, not only area. Section 6(2) says this percentage is permanent. It can change only with the consent of all apartment owners, in an amended Declaration that is registered. If your project has no registered Declaration, the Act’s formula does not apply. The share then comes from the agreement for sale and the conveyance deed. Sachi has not checked how often builders state a formula in these documents. So ask your builder for the exact basis in writing.

Point	Karnataka Apartment Ownership Act, 1972	Karnataka Apartment (Ownership and Management) Bill, 2026
Status	In force from 1 April 1975 (notification FD 28 KHB 75)	Passed by the Assembly; comes into force only on a notified date (clause 1(2))
Applies to	Property submitted by a registered Declaration (section 2)	Projects with more than eight apartments (clause 1(3))
Basis of the share	Value of the apartment against value of the property (section 6(1))	Private area of the apartment against total private area (clause 3(2))
Land in the share	Land is a common area, unless the Declaration says otherwise (section 3(f))	Undivided right, title and interest in the land (clause 3(1)(a))
Where the share is written	Declaration (section 11) and Deed of Apartment (section 12)	Declaration or deed of transfer (clause 3(2))

Sources: Karnataka Apartment Ownership Act, 1972 and LA Bill No. 14 of 2026, both checked 9 October 2026.

1.4.3 What would the 2026 Apartment Bill change?

The Karnataka Apartment (Ownership and Management) Bill, 2026 would base UDS on area, not value. The Legislative Council copy is LA Bill No. 14 of 2026, marked “As passed by the Karnataka Legislative Assembly”. Clause 3(1)(a) gives each apartment owner “an undivided and non-exclusive right, title and interest in the land”. Clause 3(2) sets the share by “the ratio of the private area of the apartment to the total private area of all apartments”. The declaration or deed of transfer can provide otherwise. Clause 2(cc) defines private area as three parts. The first part is the RERA carpet area. The second part is the area of the external walls and the exclusive balcony or verandah. The third part is 33 percent of any terrace, lawn, garden or courtyard conveyed with the flat. The title deed can state a different percentage. Clause 66 would repeal the 1972 Act. Clause 1(2) says the Bill comes into force only on a date that the State Government notifies.

The Bill gives a worked example with two flats on 300 square metres of land. Flat A has 100 square metres of carpet area. It also has 20 square metres of walls and balcony, and a 30 square metre terrace counted at 33 percent (10 square metres). Flat B has 120 square metres of carpet area and 30 square metres of walls and balcony.

Item (Bill illustration)	Flat A	Flat B
Private area	100 + 20 + 10 = 130 sq m	120 + 30 = 150 sq m
Share of total private area (280 sq m)	130/280	150/280
UDS in 300 sq m of land	139.29 sq m	160.71 sq m
Share of 140 sq m built-up common area	65 sq m	75 sq m
Super built-up area	195 sq m	225 sq m

Source: Karnataka Apartment (Ownership and Management) Bill, 2026, clause 2(ii) illustration, checked 9 October 2026.

Clause 2(m) covers a clubhouse, pool, gym or similar facility. If the facility stands on the project land, or uses the project’s Floor Area Ratio, it is part of the common areas. The builder can keep a facility only if three conditions are all met. The facility is on a separate parcel outside the project land. The sanctioned plan approves the retention. The declaration and the agreement for sale disclose it before allotment. If the builder keeps a facility, its built-up area must not count in any flat’s UDS or super built-up area. A second proviso to clause 2(hh) says every agreement for sale must show the break-up of the super built-up area. The registered conveyance deed must show it too. Clause 53(3)(c) would let the competent authority decide disputes about “the determination or calculation of the undivided share in the land”. Sachi has seen only the Assembly-passed copy. Sachi did not check the Karnataka Gazette for Council passage, assent or a commencement notification (unverified). Confirm the Bill’s status before you rely on it.

1.4.4 Where do you find your UDS in the documents?

You find your UDS in the sale documents for your flat, and you can cross-check it against the builder’s K-RERA filing. Start with the draft agreement for sale. Look for the undivided share, the total land extent, the survey numbers and the names of the parties who convey the land. Then read the draft conveyance (sale) deed. RERA section 4(2)(g) makes the builder upload the “proforma of the allotment letter, agreement for sale, and the conveyance deed” with the registration application. Ask the builder for this template before you book, and compare it with your draft. Section 4(2)(l)(A) and (B) add an affidavit from the builder. It must state “legal title to the land” and say whether the land is free of encumbrances. For a project under the 1972 Act, section 11 says the Declaration must state each apartment’s value and percentage share. Section 12 says each Deed of Apartment must state the percentage. Section 13 says both are registered under the Registration Act, 1908.

Compare the figures across all of these documents. If the share is blank, changes between drafts, or does not match the land extent, ask the builder in writing before you pay.

1.4.5 What does RERA make the builder do about the land?

RERA makes the builder transfer title to you and the land share to the association. Section 11(4)(f) and section 17(1) say the builder must execute a registered conveyance deed of the flat in your favour. The same provisions require “the undivided proportionate title in the common areas” to go to the association of allottees or the competent authority. Because section 2(n)(i) counts the entire project land as a common area, this transfer covers the land. The deadline is the period set by local laws. Where no local law sets a period, the proviso to section 17(1) gives three months “from date of issue of occupancy certificate”. Section 17(2) adds a further duty after the occupancy certificate and possession. The builder must hand over the documents and plans, including the common areas, to the association. Section 11(4)(e) makes the builder enable the association’s formation. If no local law applies, the association must form within three months of a majority of allottees booking. If the builder does not meet these duties, you can complain to K-RERA.

RERA provision	What it says about land and title
Section 2(n)(i)	The entire project land, or the entire land of a registered phase, is a common area
Section 4(2)(g)	The builder uploads the proforma agreement for sale and conveyance deed at registration
Section 4(2)(l)(A) and (B)	The builder declares legal title to the land and any encumbrances, by affidavit
Section 11(4)(f) and 17(1)	Registered conveyance deed to you; undivided proportionate title in common areas to the association
Proviso to section 17(1)	Without a local law, conveyance within three months of the occupancy certificate

Source: Real Estate (Regulation and Development) Act, 2016, checked 9 October 2026.

1.4.6 What questions should you ask the builder about UDS?

Ask the builder questions that tie your UDS to the land records, and get the answers in writing. A UDS number is only useful if you know the land extent, the total number of flats and the formula behind it. Ask for these three facts first. Then check them against the K-RERA filing, which must show the location and the land “dedicated for the project” under section 4(2)(f). If a joint development agreement splits the flats between the landowner and the builder, ask which share holds your flat, and who will sign your conveyance deed. Ask whether any clubhouse or other facility stays with the builder. Under the 2026 Bill, the builder can keep one only on a separate parcel, with plan approval and prior disclosure. Also ask whether the project is phased. Under RERA section 2(n)(i), a separately registered phase counts only the land of that phase as its common area. Take the answers, the drafts and the K-RERA documents to an independent property lawyer.

1. What exact UDS, in square feet or as a percentage, is proposed for my flat?
2. What formula and which area or value measure produced it?
3. What is the total land extent, and how many flats share it?
4. Is my flat in the builder’s share or the landowner’s share, and who signs my deed?
5. Is any facility, such as a clubhouse, kept by the builder, and on which land parcel?

1.4.7 Does a higher UDS always make a flat better?

No. A higher UDS is one data point, and it does not measure title, approvals, usable space or price. UDS figures across projects compare only when you know each project’s land extent, number of flats and formula. A tall tower on a small plot gives each flat a small share, even for a large flat. A low-rise project on a large plot gives each flat a bigger share. Neither fact tells you whether the builder has clear title, or whether the land is free of encumbrances. It also does not tell you whether the building has its approvals. Those facts come from the land records, the builder’s K-RERA affidavit and your lawyer’s title search. UDS also does not tell you how much of the flat you can use. For that, check the RERA carpet area in the agreement for sale. If the 2026 Bill comes into force, UDS will follow private area, so a bigger flat will get a bigger share. Until then, the formula in your documents decides.

Use UDS for three checks. First, check that your share matches the formula and land extent the builder states. Second, check that the conveyance deed carries the same figure as the agreement for sale. Third, check that the land under the project has clear title before you book.