Off-plan property tends to dominate the conversation in London investment marketing. The logic is straightforward: a discounted entry price, potential capital appreciation between exchange and completion, and staged capital deployment that preserves liquidity during the construction period. Ready-to-move assets are less prominently promoted, partly because the economics look less dramatic at the headline level.
The question is not which structure is better, but which risks the investor is being paid to take.
Table of Contents
What off-plan concentrates
An off-plan transaction concentrates risk into a single window: the period between exchange and completion. Within that window, the investor is exposed to delivery risk, specification risk, and financing contingency simultaneously.
In parts of the London residential market — particularly among smaller and mid-tier developers — delays of 12 to 24 months have occurred frequently enough in recent years that modelling them as a plausible scenario, rather than a tail risk, is defensible underwriting practice. The frequency varies significantly by developer tier, project scale, and planning complexity; it is not a uniform claim about the market.
The structural consequence matters most when the investor has a fixed hold horizon or an income requirement. Consider a simplified illustration: a leveraged acquisition with a projected 6% net yield and a 5-year hold assumption, completed on time, produces an IRR in the low double digits under reasonable financing assumptions. An 18-month delay compresses the income period to approximately 3.5 years and, under the same assumptions, moves the IRR toward the high single digits.
The headline yield is unchanged. The return on time-weighted capital is not.
The actual compression depends heavily on the specific financing structure, void assumptions, transaction costs, and tax position. The point is not a precise figure — it is the direction and the mechanism: a delay does not affect the yield; it affects the period over which the yield compounds.
There is a further variable that the headline return calculation often omits: what the investor earns on undeployed capital during the construction window. In higher-rate environments, this changes the opportunity-cost profile of the investment — a variable that becomes more relevant as the construction period extends and alternative liquid instruments offer meaningful yields.
Off-plan also carries advantages that ready-to-move does not. Staged payments — exchange deposit now, mortgage drawdown at completion — mean lower equity committed in the early period. In rising markets, the gap between the exchange price and the completion-day value represents embedded appreciation requiring no additional equity. These are real structural advantages, and they explain why off-plan has historically attracted international and leveraged investors despite the delivery risk.
Off-plan offers optionality. Ready stock offers delivery certainty. Neither dominates the other in the abstract.
Entry-point analysis often underweights exit liquidity timing. In large schemes, many off-plan investors reach completion simultaneously and attempt to exit into the same resale window. The resulting supply concentration can compress exit pricing or extend time-on-market precisely when investors expect to realise gains. Ready-to-move assets carry their own liquidity risks, which vary by building and sub-market. But the resale conditions are normalised — the investor is not competing against a wave of identical units from the same developer completing at the same time.
At a glance: where each structure carries risk
What ready-to-move changes — and what it does not
Acquiring an existing asset removes delivery and specification uncertainty. The building is observable. EWS1 and cladding status, floor plan efficiency, finish quality, and building management record are verifiable from documentation or assessable on inspection.
What changes most practically is the evidence base at underwriting:
Income. Rental data for a completed flat in a specific building and postcode district can be assessed against Land Registry and ONS records for comparable transactions — not against a developer's occupancy model. Where the comparable base is deep, this produces a meaningfully higher-confidence yield estimate.
Historical service charge is observable. Actual service charge accounts and a reserve fund statement are part of the leasehold documentation. This is not the same as knowing future service charges — major works, insurance repricing, cladding remediation, and reserve fund deficits can move the number materially from any historical baseline. What the investor gains is a starting point grounded in actual figures, rather than a developer's opening projection.
Lease term is known. If the remaining term is below 80 years, the extension cost under current leasehold legislation, the lender restrictions this triggers, and the effect on future saleability are quantifiable before exchange.
Financing is structured against a completed asset. Ready-to-move transactions typically require full financing deployment at or shortly after completion, rather than after a multi-year construction period. The mortgage offer is underwritten against the property as it stands and is not contingent on a future completion event or credit conditions at that future date.
What ready-to-move does not remove: exposure to the current valuation level, which is fully priced in. There is no entry discount. Capital growth depends entirely on market performance from the acquisition date forward.
The direction of the London residential market over the next five years is not knowable with precision. What can be analysed is where the investor's exposure sits under different scenarios — and on that dimension, ready-to-move requires a clear-eyed view of current pricing, because there is no embedded appreciation cushion to absorb a near-term correction.
A ready-to-move asset also carries its existing history into the transaction. A building with an unresolved remediation liability, thin secondary market transaction volume, or a deteriorating reserve fund is those things whether or not it is available today. In several respects, secondary-market due diligence is more intensive than off-plan underwriting, because the investor acquires a building with an existing operational history — and that history contains both evidence and liability.
Which investor this matters to
The trade-off between the two structures is not uniform across investor profiles.
For a cash buyer, the leverage efficiency arguments for off-plan are less relevant. The staged payment structure matters less when no financing is involved, and income certainty from day one may matter more.
For a leveraged buyer, deferred debt drawdown in off-plan reduces interest costs during the construction period — a meaningful benefit under current financing conditions.
For an investor with a defined yield mandate and fixed time horizon, the delivery certainty of ready-to-move removes a category of scenario risk that the off-plan position carries structurally. A construction delay is not tail risk for this investor — it is a plan failure.
For an international investor primarily concerned with title security and income repatriation, both structures in the UK operate under the same legal framework. Ready-to-move provides a registered title against a known asset from exchange; off-plan creates interim exposure to the developer's financial position and delivery capability.
In practice, allocation decisions are not always driven purely by underwriting logic. Liquidity preferences, geography exposure, currency considerations, and behavioural comfort frequently influence which structure an investor chooses alongside projected returns. A framework that accounts for risk and evidence quality is a useful input; it is not a substitute for the investor's own view of those factors.
The questions that matter at underwriting
For a ready-to-move asset specifically:
- What does the actual rental market pay for this specification and building — from verified comparable transactions, not from the agent's asking-price estimate?
- What is the remaining lease term, and if below 80 years, what is the extension cost and the impact on mortgage availability?
- What has the actual service charge been over the past three years, what is the reserve fund balance, and are there known upcoming major works liabilities?
- What is the EWS1 and cladding status, and what are the implications for resale and lender appetite?
- How many transactions have taken place in this building in the past 24 months, and what is the typical time-on-market for comparable units?
- Under what terms has the lender confirmed financing, and how does the return behave if rates move materially during the hold period?
These answers are either in the public record or surfaced through standard due diligence. The ready-to-move category is, in that respect, more transparent from an underwriting perspective — the inputs are observable, even when the conclusions remain uncertain.
Further reading
- Inside the IB Score: How We Rate London Property Investment — the full scoring methodology across six categories and twelve sub-scores
- Off-Plan in London: What the Developer Brochure Doesn't Model — delivery risk, IRR mechanics, and escrow structures
- Liquidity as a Return Driver: Why Exit Conditions Matter More Than Entry Yield — how the IB Score Liquidity category works and what it surfaces
- Leasehold, Safety, and Title Risk in UK Property — the Safety category in detail, from lease length to country risk
Income and rental data referenced in this article draw on Land Registry transaction records and the ONS Rental Price Index. Return illustrations are directional only and do not constitute investment advice. Actual returns depend on financing structure, tax position, void periods, transaction costs, and market conditions. Past performance is not a guarantee of future results. For legal, tax, and structuring questions we direct you to qualified counsel.