From Booking to Registration: The Chennai Flat Buying Process, Step by Step

Buying a flat in south Chennai looks simple from the outside. You like a project, you pay, you collect the keys. In practice there are eight or nine distinct stages between your first site visit and the day your name actually sits on the registered sale deed. Each one carries its own paperwork, its own money out of your pocket, and its own way of going wrong if you rush it.

This guide walks the whole process in order, the way it actually unfolds for a buyer in Velachery, Medavakkam, Sembakkam or East Tambaram in 2026. We have put rough timelines against each stage so you can plan around your loan, your current rent, and your own patience. Treat the weeks as typical, not promised. A clean resale flat with a single owner moves much faster than an under-construction project with three approvals still pending.

Read it once before you book anything. The most expensive mistakes in this process happen in the first fortnight, when the booking advance is already paid and the legal check has not even started.

Stage 1: Shortlisting and site visits (2 to 4 weeks)

Most buyers spend longer here than they expect, and that is fine. It is the cheapest stage to spend time in. Fix your budget first, including the costs that never show on the price banner: stamp duty and registration, GST if the flat is under construction, covered parking, corpus and the first year of maintenance, plus a buffer for interiors. A flat quoted at 78 lakh in Medavakkam often lands closer to 88 to 90 lakh all-in by the time you have keys.

Visit at least three or four projects in your target localities before you commit to one. See the actual flat on offer, not just the show flat. Go once in daylight and, if you can manage it, once after 7 pm to judge traffic, parking pressure and water tanker activity. Walk the approach road in your own vehicle during a weekday peak.

• Check the carpet area against the quoted saleable area. A 1,000 sq ft 'saleable' 2 BHK can carry an efficiency anywhere from the high 60s to the mid 70s percent.
• Ask which approval the project holds, CMDA or DTCP, and whether it is a full planning permit or only a layout approval.
• For under-construction, ask for the completed-tower track record of the same builder, not glossy renders.
• Note the floor on offer. Heat, monsoon water ingress and lift dependence all change with floor in Chennai.

Our locality field guides are written for exactly this stage. If you are weighing areas against each other, the Velachery buyers' field guide and the Velachery, Medavakkam and Nanganallur comparison will save you a few wasted trips.

Stage 2: Token or booking advance (a few days)

Once you have chosen, the builder or seller asks for a token, sometimes called booking advance. This is usually 1 to 2 lakh for a resale deal, or a defined booking amount, often in the range of 1 to 5 percent of the flat value, for a new project. Its only real job is to take the flat off the market while the paperwork is drawn up.

Be clear about what the token actually commits you to, because this is where buyers lose money. Get a written receipt that states the flat number, the agreed price, what the token covers, and the refund terms if the deal falls through on legal grounds. A verbal 'fully adjustable' means nothing three weeks later.

In an under-construction project, the booking is usually followed within a couple of weeks by the allotment letter, which formally assigns the unit to you and sets out the payment schedule. Read that schedule closely before you treat the booking as final.

Stage 3: Sale agreement, construction agreement and the sale deed (1 to 3 weeks to draft)

People use these three terms loosely, so it is worth separating them clearly. They are not the same document and they do not happen at the same time.

Sale agreement (agreement to sell)

This is the contract that records the agreed price, the payment milestones, the timeline and the conditions both sides must meet before the final transfer. It is signed early, once you and the seller agree to proceed. For a resale flat this is often the main agreement before registration.

Construction agreement (under-construction only)

In many new projects the deal is split into two: an agreement for the undivided share of land (UDS), and a separate construction agreement for building your flat. This split affects how stamp duty and GST apply, so do not sign it without understanding the breakup. Our GST on under-construction flats guide explains why this structure matters to your final cost.

Sale deed

This is the document that actually transfers ownership to you, and it is what gets registered at the sub-registrar office at the end. For a resale flat the sale deed is registered once payment clears. For an under-construction flat, the sale deed for the UDS is often registered early while construction continues, and the building is handed over later against the construction agreement. Know which model your project uses before you plan your loan around it.

Stage 4: Legal due diligence and title verification (1 to 3 weeks)

This stage runs in parallel with the agreement drafting and it is non-negotiable. Engage a property lawyer who is independent of the builder. Their job is to confirm the seller can legally sell, and that nothing is attached to the property.

• Encumbrance Certificate (EC) covering roughly the last 13 to 30 years, to confirm there is no existing mortgage or charge on the flat.
• Parent documents and the full title chain showing how ownership reached the current seller.
• Approved building plan and the planning permit (CMDA or DTCP), checked against what is actually built.
• Patta and chitta for the land, with property tax receipts up to date.
• For apartments, the developer's land title and the UDS allotted to your specific flat.

If anything in the chain looks broken, a gift deed with no clear consideration, a legal heir who has not signed, a release deed that is missing, this is the moment to fix it or walk. It is far cheaper to lose a booking advance than to litigate a defective title for years. Our EC, patta and chitta explainer and the property documents field checklist cover what each document should show.

Stage 5: Home loan sanction and disbursement (2 to 4 weeks for sanction)

You can start the loan process in parallel with due diligence. Sanction and disbursement are two different events, and confusing them causes most of the friction at registration.

Sanction is the bank agreeing, in principle, to lend you a certain amount based on your income, credit score and the property. It typically takes two to four weeks and involves the bank running its own legal and technical (valuation) check on the flat. Expect the bank to independently verify the title and approvals, which is a useful second opinion at no extra cost to you.

Disbursement is when the money actually moves, and the timing depends entirely on the flat type.

• Ready-to-move or resale: the full loan is usually disbursed in one shot, against the registered sale deed, on or just after registration day.
• Under-construction: the loan is disbursed in tranches linked to construction milestones such as foundation, slabs, brickwork and finishing. The bank releases each stage after verifying progress, so your pre-EMI interest builds up gradually.

Keep your own contribution, the margin, ready in advance. Banks fund a percentage of the value, not all of it, and they release their share only after your share is visibly in. For the eligibility maths, see the home loan eligibility guide.

Stage 6: The payment schedule

For a resale flat the schedule is simple. Token first, then the balance on registration day, with the bank's portion landing against the registered deed. Clean and quick once the loan is sanctioned.

For under-construction the schedule is milestone-linked and written into your agreement. A typical structure looks like the list below, though every builder differs.

• Booking amount on allotment.
• A larger instalment on completion of the foundation or basement.
• Staged payments tied to each floor slab or structural milestone.
• Payments on brickwork, plastering, flooring and fittings.
• A final tranche on completion and before handover, sometimes held until the completion certificate is issued.

Pay strictly against milestones that you or the bank have verified, not against the builder's invoice alone. If the project is genuinely behind, your money should be too. This single discipline is what separates buyers who get burned from those who do not, and it is a recurring theme in our guide to vetting a local builder.

Stage 7: Registration at the sub-registrar office (the actual day)

This is the legal heart of the whole process. Until the sale deed is registered, you are not the owner, whatever you have paid. Registration happens at the sub-registrar office (SRO) for the jurisdiction the property falls under.

Guideline value, stamp duty and registration fee

Stamp duty and registration fee are calculated on the higher of the actual sale value or the government guideline value for that street. As of 2026 in Tamil Nadu, stamp duty is in the region of 7 percent and the registration fee around 4 percent for a sale deed, so budget roughly 11 percent of the flat value for this line alone. Check the guideline value for the exact street beforehand. It varies considerably even within Medavakkam or Sembakkam. The stamp duty and registration charges guide has the current breakdown and the small print on how UDS-plus-construction deals are charged.

Documents to carry

• The drafted sale deed on the correct stamp value.
• Original parent documents and prior title deeds.
• Latest EC, patta and property tax receipts.
• PAN and Aadhaar (and Form 60 where applicable) for both buyer and seller.
• Passport-size photos, plus the loan sanction or DD details if the bank is funding.
• Two witnesses with their own ID proof.

What happens on the day

You present the deed, the SRO verifies the stamp duty payment, and buyer, seller and witnesses give thumb impressions and signatures. Biometric capture, fingerprint and photo, of the parties is standard now. Where a bank loan is involved, the bank's demand draft or representative is coordinated so the seller is paid at or immediately after registration. The signing itself takes a couple of hours on a normal day, though SROs get busy. The registered document is returned to you afterwards, sometimes the same day, sometimes within a couple of weeks.

Stage 8: Possession and handover (immediate for ready, variable for under-construction)

For a ready or resale flat, possession follows registration almost immediately. Do a joint inspection, take meter readings, collect all keys and any amenity access cards, and get a signed handover note listing what is included.

For under-construction, possession comes only after construction finishes and ideally after the completion certificate is issued. Insist on a snagging walkthrough before you accept handover. Check seepage points, door and window alignment, electrical points, water pressure on your floor, and the actual finishes against what was promised. Get the snag list signed and fixed before you sign the possession letter, not after.

Stage 9: Post-registration steps most buyers forget (2 to 8 weeks)

Registration is the finish line for the deal, not for the paperwork. A few transfers still need doing, and leaving them undone causes headaches when you eventually sell.

• Patta transfer: apply to mutate the patta into your name through the revenue department or the TN online portal, so land records reflect you as owner.
• Property tax (GCC) transfer: get the assessment updated to your name with the local body, so future tax receipts carry your name.
• Utility transfers: change the TNEB electricity service connection name, and the water and sewerage account, into your name.
• Owners' association: in a new project, join or help form the association, take over the corpus and maintenance handover from the builder, and collect the common-area documents.

Keep a single file, physical and scanned, holding the registered sale deed, the EC reflecting your purchase, the updated patta, tax receipts and utility transfer confirmations. That file is what a future buyer's lawyer will ask for, and a complete one adds real value at resale.

How long does the whole thing take?

For a clean ready-to-move or resale flat with a single owner and a sanctioned loan, the path from booking to registration commonly runs four to eight weeks, with due diligence and loan sanction overlapping. Add time if the title needs cleaning up or the seller's documents are incomplete.

For under-construction, registration of the UDS can happen early, but full possession depends on the construction timeline, often a year or more from booking. Your payment and your loan disbursement stretch across that period, milestone by milestone. If you need a roof over your head soon, that difference matters. The ready-to-move versus under-construction comparison lays out the trade-off in detail.

The short version

Shortlist properly, pay the token only after a first look at the title, run legal due diligence and the loan in parallel, pay strictly against verified milestones, and treat registration day as the moment ownership actually changes. Do the post-registration transfers while the deal is still fresh. None of these stages is hard on its own. The buyers who get into trouble are almost always the ones who paid real money before the legal check was done.

For the stages that need a deeper read, see our guides on the real cost of owning a flat in Chennai, resale versus new construction, and the property documents field checklist. When you are ready to look at specific flats in Velachery, Medavakkam, Sembakkam or East Tambaram, reach out to our team and we will walk the process with you, stage by stage.