1,400 Completed Central London Homes Remain Unsold as Developers Face Financing Pressure

Central London had 1,400 completed but unsold homes at the end of September 2026, exposing a growing gap between finishing a development and recovering the money invested in it.

The Zone 1 total was approximately three times its 2016 level, according to Molior research reported by The Guardian on 11 November, with the investigation updated on 12 November. Construction starts in the same area were 75% lower than a decade earlier.

The report describes developers facing higher construction costs, more expensive borrowing and weaker demand for luxury apartments. For businesses carrying completed stock against an outstanding development loan, a slower sales programme can turn a marketing problem into a refinancing deadline.

A smaller building pipeline has not cleared the backlog

The combination of fewer starts and more finished homes awaiting buyers is significant. Developers are reducing new activity while capital remains committed to schemes already delivered. A completed apartment may be a valuable asset, but it cannot repay a loan until a sale or another funding arrangement converts that value into cash.

Earlier research from JLL, published on 28 May 2026, had already identified weakening demand as a constraint on London’s new-homes market alongside viability pressures and higher finance costs. Its analysis highlighted purchase taxes, a smaller buy-to-let investor market and service charges among the obstacles facing buyers.

Those findings provide context for the latest Zone 1 figures, rather than a directly comparable stock measure. They also explain why London’s broader housing shortage does not guarantee a quick sale for a particular high-value apartment. The relevant test is whether buyers will transact at a price that supports the scheme’s costs and debt.

The development loan can outlast the construction programme

Practical completion removes much of the building risk, but it does not end the developer’s financial obligations. Interest, insurance, security, maintenance and marketing expenditure can continue while the remaining homes are sold. Where interest is added to the borrowing, the redemption balance can rise even without a monthly payment leaving the business.

A development appraisal normally allows time for sales. Pressure builds when that allowance proves too short, particularly where repayment depends on a small number of expensive apartments. One delayed transaction can represent a substantial part of the expected proceeds.

Willow’s assessment is that the immediate financing question is whether the developer has enough time and cash to carry out a credible disposal plan. That requires comparing the current lender’s extension terms, a replacement facility and the net proceeds available from selling sooner.

Exit lending is available, but each scheme must support it

Development-exit finance can replace the original development loan once construction is complete or sufficiently advanced for the new lender. GB Bank’s published product explanation describes short-term funding for completed or nearly completed schemes, giving developers time to sell or move to longer-term borrowing. Its interest options include retained, rolled-up and serviced arrangements.

There is evidence of this funding being used on partially sold London developments. In a published Wimbledon case study, Shawbrook reports providing a £2.98 million exit facility for a nine-unit scheme where four sales had already completed. The lender says the refinance supported the remaining sales and released equity for future projects.

That transaction illustrates a financing route, not an indication that the same terms are available for central London’s unsold luxury stock. Valuation, debt, the borrower’s position and the expected pace of sales all influence what a new lender can support.

The commercial distinction is between a viable scheme that needs a longer sales period and one whose achievable proceeds are insufficient to repay its obligations. Refinancing may assist the first. Further borrowing can make the second more difficult to resolve.

Net proceeds matter more than the headline facility

A replacement loan must be assessed against the amount needed to redeem the existing debt. An apparently generous loan-to-value limit can leave a shortfall once retained interest, arrangement fees and other deductions are taken into account.

The valuation therefore has a direct bearing on whether a refinance can complete. Original launch prices or projected gross development value may be less useful than recent completed sales, current competing stock and a realistic assessment of the remaining apartments. Any cash shortfall needs a credible funding source before the existing facility expires.

Waiting for a higher price can reduce the final return

The decision to extend the sales period needs to account for its cost. Keeping an asking price unchanged does not preserve the developer’s return if interest and holding expenditure absorb the eventual proceeds.

For illustration, £4.8 million of debt at an assumed 0.75% a month incurs £36,000 in monthly simple interest. Six months would add £216,000, before fees, compounding or other costs, assuming no repayments. A £150,000 reduction to secure an immediate sale of the same stock could therefore cost less than waiting six months for the higher price.

That comparison is not a recommendation to accept a discount. It shows why the timing and certainty of sales matter alongside the price. A stronger pipeline, phased completions and earlier debt repayments could produce a different result. The appropriate comparison is the cash left after all costs under each realistic scenario.

The remaining apartments need individual scrutiny

A single total for unsold stock can conceal very different selling prospects. A penthouse, a small flat and an apartment carrying substantial service charges may attract different buyers and require different marketing periods. The financing review should reflect those differences.

Completed sales, reservations, exchanged contracts and enquiries should also be distinguished. They do not provide the same degree of certainty. Outstanding warranties, certificates or legal issues may delay completion even where a buyer has agreed a price.

The loan’s unit-release provisions are equally important: they determine how much must be repaid when an apartment is sold to obtain the lender’s release of its security. Forecast sale proceeds cannot automatically be treated as cash available for the developer’s next project.

Renting selected apartments may be another option, but it changes the assessment. Expected rent after costs, lender consent and the availability of appropriate longer-term finance all need consideration. A rental strategy should be appraised on its own merits, including its effect on a later sale.

Earlier reviews give developers a clearer choice

For developers and their professional advisers, the useful starting point is a current schedule of unsold units, individual valuations, outstanding debt, the facility expiry date and monthly holding costs. That should be accompanied by the sales pipeline, any remaining works or documentation, and a repayment forecast that allows for further delays.

Accountants, solicitors and surveyors can help establish whether the obstacle is timing, price, documentation or a wider viability problem. Where the expected proceeds no longer support the debt, restructuring advice may be needed alongside a finance review.

The latest figures make this a specific funding issue for completed schemes. For a viable development, the objective is to match borrowing to an achievable sales programme, with the cost of waiting included from the outset.