I don't think that a plan not approved by the BDA, in the jurisdiction of BDA would be a good investment. If the builder is duping the authorities he may as well take you for a ride.

if theBDA has not approved, then the layout is irregular and you may not get a valid "A" Khatha. 

The plan is necessary irrespective how small the plotting is. Double check with the authorities.

Yes being the said property includes some illegalities it will lead to be registered as b khata property

Yes you can purchase it.

Do not purchase plot if builder has not obtained approval from BDA 

the builder will saddle the purchaser with penalties imposed by the authorities 

Only purchase plot where layout plan is approved 

1. If the property is located within the limits of BBMP, then layout plan could have been obtained from the Town Planning Department/BBMP.

2.  Whether NOCs from statutory authorities obtained?.

3.   It's advisable to get the property papers checked by a Lawyer, before proceeding further.

Dear Sir/Madam,

You are suggested to confirm the claim of developer from the BDA as to whether the such approval is needed or not. It is sure that the BBMP will impose penalty and development/betterment charges as and when it comes to its notice. So, if you are planning to purchase the land, keep the these things in mind.  

Kindly check in the BBMP office whether there is any reservation or not and B khata rules will be applicable to this layout land. If yes than only process to purchase otherwise not. 

No dont go for it, u need approval

Confirm this matter from the office of BDA

I would not suggest you to go ahead with purchase of property where layout plan is not approved by BBMP.

Builder is faking. Only after layout plan approval, purchase is advisable.

It is not A khata and certain penalty will impose.

- As per law, the permission and approval of BDA is mandatory to develop any land in the Bangalore Metropolitan Region.

- Further , Bruhat Bengaluru Municipal Palike (BBMP) is only an administrative group that maintains and manages civic amenities and infrastructural assets of the Greater Bangalore metropolitan area , and is responsible for the property tax collection, with a right to collect taxes from illegally constructed buildings in Bengaluru.

- Hence, it is suggestion to buy a BDA approved property. 

A press report few yeares ago states as follows:

BDA razes illegal buildings

BANGALORE: The development of a layout was allowed years ago and construction of buildings allowed there without BDA sanction. If that is incredible, what happened on Monday is even more so. BDA launched a sudden demolition drive, describing the layout and structures on Hosakerehalli 80 Feet Road as illegal and leaving many helpless owners in deep despair.

Property owners, who were farmers earlier and had parted with their land for layout formation, lost their properties on Monday all because the developer allegedly kept the BDA in the dark. How the layout was formed is a mystery.

BDA identified 51 unauthorized constructions in the Vishwabharati Housing Co-operative Society and started demolition at 6am. Among them, nine property owners had obtained a court stay order.

BDA has demolished buildings in the past due to unauthorized layout formation without provisions for civic amenities

It is better to stay away from unapproved layouts.

The builder will give thousands of tall promises in order to promote the sales.

The builder will not be traceable when the authorities take action to raze or demolish the constructions as per law.

It is illegal to buy the plots from an unapproved layout 

You will not get A khata nor any basic amenities like water or electric supply etc.

Sites formed in unauthorized layouts are called Revenue Sites. The lay-outs which are formed without following the mandatory procedure and the requirements of law are called unauthorized layouts and can be classified into two:

1. 
   Converted land unauthorized layout: In this type of layouts, sites are formed in the lands which are converted from agricultural to non-agricultural residential purpose after obtaining conversion order from Deputy Commissioner and in conformity with the zonal regulations but without obtaining approved layout plan from the competent authority. Village Panchayat are not competent to approve the lay-out plans.
2. 
   Agricultural land unauthorized layout: In these layouts, sites are formed on the agricultural lands not converted and without obtaining approved layout plan from the competent authority. Purchase of this type of site is very risky as marketable title would not be available to the purchaser. Sites formed in either of the classification referred to above are called as revenue sites. In such sites, electricity, water, sanitation and civil amenities will not be available to the site owners though providing of these facilities are the mandatory requirements as envisaged under the Karnataka Town Planning Act, 1961.