Under Construction vs Ready to Move: The Complete Decision Guide for 2026

The Eternal Dilemma for Indian Home Buyers

Should you book an under-construction flat and wait 2 to 4 years for possession, or pay a premium for a ready-to-move flat you can occupy next month? This is one of the most common questions asked on Brickplot, and the honest answer is: it depends on your financial profile, your risk appetite, and — critically — how well you can evaluate a specific builder's delivery track record. This guide breaks down every dimension of the comparison so you can make an informed decision rather than a hopeful one.

Price Difference: How Big Is the Gap Really?

Under-construction (UC) flats are typically priced 15 to 25 percent lower than comparable ready-to-move (RTM) flats in the same micro-market at the time of launch. The gap varies significantly by city and micro-market: in Bengaluru's Whitefield corridor, the UC discount at launch is typically 18 to 22 percent; in Mumbai's western suburbs, it ranges from 20 to 28 percent, partly because Mumbai builders face higher financing costs which they pass on to early buyers as a larger discount. In Gurugram's Dwarka Expressway belt, the UC versus RTM gap has narrowed to 12 to 18 percent post-RERA as buyers have become more cautious.

However, the price gap narrows significantly as the project moves through construction stages. A project that is 70 percent constructed and 18 months from expected possession may be priced only 8 to 10 percent below an equivalent RTM unit. The maximum discount is always at pre-launch or launch stage — when the delivery risk is also highest.

GST: A Significant and Often Overlooked Cost Differentiator

GST is one of the clearest and most concrete financial differences between an UC and an RTM purchase:

• Under-construction flats: GST applies at 5 percent of the total agreement value (base price plus car parking plus any other charges included in the agreement), subject to a one-third land cost deduction built into the GST calculation mechanism. For affordable housing units — projects with a carpet area under 60 sq m in metros or 90 sq m in non-metros, priced at or below ₹45 lakh — the effective GST rate is 1 percent.
• Ready-to-move flats with OC: Zero GST. Properties for which the builder has received the Occupancy Certificate are entirely outside the GST net. The transaction is treated as a sale of immovable property, not a supply of construction services.

On a ₹1 crore flat, GST at 5 percent adds ₹5 lakhs to the UC purchase cost. This meaningfully offsets the headline UC price discount. After accounting for GST, the effective UC price advantage over RTM narrows by a third to a half in many cases. Always add GST to the UC comparison price before calculating your actual savings.

Delivery Risk Under RERA: Better, But Still Real

The biggest risk with under-construction properties is delay — or in the most severe cases, abandonment. RERA, which has been in force since 2017, has materially improved builder accountability. Key RERA protections for UC buyers include:

• Mandatory quarterly construction progress reports filed on the state RERA portal — visible to any buyer
• 70 percent of all advance payments from buyers must be maintained in a separate escrow account and can only be withdrawn in proportion to certified construction progress, reducing fund diversion risk
• Buyers are entitled to interest compensation at SBI MCLR plus 2 percent per month for every month of delay under Section 18 of RERA
• Buyers can seek project completion through RERA's adjudicating mechanism if delays are severe, or apply for a refund with interest

Despite these protections, delays of 1 to 3 years beyond the committed possession date remain common across Indian cities, especially in large township projects and those by highly leveraged developers. RERA enforcement quality also varies considerably between states — Maharashtra and Karnataka have relatively robust enforcement; some other states remain weak. Research the specific builder's delivery track record thoroughly before committing to a UC booking.

Tax Benefit Timing Differences

For buyers financing the purchase with a home loan, the timing of tax deductions differs significantly between UC and RTM:

• UC property: Section 24(b) interest deduction and Section 80C principal deduction are available only from the financial year in which possession is received. Pre-construction interest (paid during the construction period) is aggregated and claimed in five equal annual instalments beginning from the year of possession — subject to the ₹2 lakh annual cap for self-occupied properties. You receive no annual tax deduction during the waiting period.
• RTM property: Both deductions under Section 80C and Section 24(b) begin immediately from the year of purchase and loan disbursement. For a high-income buyer in the 30 percent tax bracket under the old regime, this can mean a significant cash flow difference over 2 to 3 years.

Lender Preference and Loan Structure

For UC properties, banks disburse the loan in tranches linked to construction stage milestones: foundation, plinth, slab completion for each floor, and so on. During construction, borrowers pay Pre-EMI — interest only on the disbursed amount — which is typically lower than the full EMI. However, many buyers find the dual burden of rent and Pre-EMI simultaneously very stressful, particularly in expensive rental markets like Bengaluru or Mumbai.

For RTM properties, the full loan is disbursed upfront and full EMIs begin immediately. This is structurally simpler and avoids the Pre-EMI trap, but means a larger monthly outgo from day one. Lenders also consider RTM loans lower risk (no construction completion risk), which can sometimes translate into marginally better loan terms or faster processing.

Who Should Choose Under-Construction?

• You are currently renting and are financially comfortable managing rent plus Pre-EMI for 2 to 3 years
• You have done thorough research on the builder's delivery track record and are satisfied (check RERA quarterly filings for all their projects)
• You want a brand-new flat with the ability to customise finishes, fixtures, or minor layout tweaks — options not available in RTM purchases
• Budget constraints are real and the effective UC savings (after GST) materially improve your affordability
• You are buying as a long-term investment and the micro-market has strong appreciation fundamentals

Who Should Choose Ready-to-Move?

• You need to occupy within 3 to 6 months due to a school admission, job relocation, or family situation
• You want to inspect the actual completed flat — not a sample unit that may differ in finish and space feel from what you receive
• The builder's track record is unclear, mixed, or you cannot find reliable data on their past project completions
• You are not willing or able to manage the financial strain of paying both rent and Pre-EMI simultaneously
• You want rental income immediately (buying as investment) with no waiting period

5 Questions to Ask Before Finalising Your Choice

• How many projects has this builder delivered on time in the last 5 years, and how many are delayed? Check every project on their RERA page — the data is public.
• What is the builder's debt-to-equity position and are they diverting funds from any project? Highly leveraged builders face liquidity crises that no escrow rule can fully prevent.
• Is the project RERA registered with a current (non-expired) registration? Never buy UC without an active RERA registration. A lapsed registration is a serious warning sign.
• What are the actual penalty terms in the allotment letter for delay? The RERA default rate applies, but some builders offer stronger contractual guarantees — compare these across shortlisted projects.
• After accounting for GST and Pre-EMI costs, what is the real effective saving vs an RTM alternative? If the after-GST discount is under 10 percent, RTM is often the financially rational choice once you factor in carrying costs.

Brickplot's Take

Our Delivery Reliability score is one of 11 axes in the Brickplot Score and is the single most important axis for under-construction buyers. We track RERA quarterly filings, the gap between promised and actual possession dates across a builder's completed projects, and the complaint-to-unit ratio on state RERA portals. A builder with a Delivery Reliability score of 8 or above from Brickplot is one we are comfortable recommending for an UC purchase with reasonable confidence. Anything below 6, and we recommend either waiting for an RTM option from that builder, or switching to a different developer altogether — the price discount rarely compensates for the stress, financial cost, and uncertainty of a genuinely unreliable builder.