A Third of New-Build London Flats Are Unsellable: Why Serviced Accommodation Is the Arbitrage Play of 2026

According to a recent Telegraph report, one third of new-build London homes failed to sell to private buyers last year. Developers are sitting on thousands of high-spec flats across the capital, slashing prices and throwing in incentives just to shift stock. For most people, that headline reads like bad news. For savvy London landlords and property investors, it reads like an invitation.

Here's the opportunity in plain terms: you can now acquire brand-new, beautifully finished flats at steep discounts, then reposition them as corporate serviced accommodation to capture booming business travel demand. With corporate travel spending growing at 8.1% year on year, this is arguably the smartest arbitrage play available to London property investors right now.

Let's break down exactly how it works, what you need to watch out for, and how to execute it without losing sleep.

Why Are So Many New-Build Flats Sitting Empty?

The short answer: pricing and market mismatch. Developers built for a bullish market that didn't fully materialise. Higher interest rates, stricter mortgage criteria, and a cost-of-living squeeze have pushed many first-time buyers and owner-occupiers to the sidelines. International investor appetite has also cooled compared to the mid-2010s boom.

The result? Thousands of completed, high-quality apartments with modern kitchens, integrated appliances, concierge services, and gym access are sitting vacant. Developers need to move these units off their books, which means they're open to negotiations that would have been unthinkable two years ago. We're talking discounts of 10 to 20 percent off asking prices, plus sweeteners like stamp duty contributions, furniture packages, and rental guarantees.

For landlords, this dramatically lowers the barrier to entry.

What Is Serviced Accommodation and Why Does It Work Here?

Serviced accommodation sits in the sweet spot between traditional buy-to-let and hotel stays. Think fully furnished apartments, professionally managed, offered on flexible terms ranging from a few nights to several months. The target market is typically corporate tenants, relocating professionals, project teams, and business travellers who want more space and privacy than a hotel room at a competitive nightly rate.

Here's why new-build flats are a near-perfect fit for this model:

• Move-in ready: New builds come with modern finishes, fitted kitchens, and often furniture packages, meaning minimal setup costs.
• Amenities included: Gyms, concierge desks, bike storage, and co-working spaces tick every box for corporate guests.
• Consistent quality: Unlike older conversions, new builds offer a predictable product that's easy to market and maintain.
• Desirable locations: Many unsold developments sit in well-connected zones like Canary Wharf, Nine Elms, Stratford, and the South Bank, all areas with strong corporate demand.

When you combine discounted purchase prices with premium nightly rates (often two to three times what you'd achieve with a standard AST), the yield potential is genuinely compelling.

The Numbers: What Kind of Returns Are Realistic?

Let's sketch out a realistic scenario. A one-bedroom flat in Zone 2 that was listed at £500,000 might now be available for £425,000 with developer incentives. On a traditional buy-to-let, you might achieve £1,800 per month, giving you a gross yield of around 5.1%.

As serviced accommodation, that same flat could generate £120 to £160 per night. Even at a conservative 75% occupancy rate, you're looking at monthly revenue of £2,700 to £3,600. After management fees and operating costs, your net yield could sit comfortably between 7% and 10%, sometimes higher in peak months.

That spread between traditional rental income and serviced accommodation revenue is where the arbitrage lives. And with business travel demand continuing to climb, occupancy rates in well-managed London serviced apartments remain robust.

What You Need to Know Before Jumping In

This isn't a strategy you can sleepwalk into. There are genuine complexities that catch out landlords who haven't done their homework.

Lease and Planning Restrictions

Many new-build leases contain clauses restricting short-term letting. Some explicitly prohibit lets of fewer than 90 days. Before committing to a purchase, you need to scrutinise the lease terms carefully and, ideally, negotiate with the developer for permissions that support flexible letting. In some London boroughs, you'll also need to consider the 90-day rule for short-term lets, though serviced accommodation for corporate stays of 30 days or more can sidestep this entirely.

Service Charges and Ground Rent

New-build service charges in London can be eye-wateringly high, sometimes £4,000 to £8,000 per year. These eat directly into your margins, so factor them into every projection. Ground rent reforms have helped on one front, but service charges remain the hidden cost that trips up many investors.

Furnishing and Setup

While new builds come finished to a good standard, corporate serviced accommodation requires a specific level of fit-out. Think quality linens, a fully equipped kitchen, reliable Wi-Fi, a smart TV, and thoughtful touches like a Nespresso machine and a welcome pack. The upfront cost is manageable, typically £3,000 to £8,000 for a one-bed, but it needs to be budgeted.

Ongoing Management Is Intensive

This is the part most landlords underestimate. Serviced accommodation isn't passive income in the way a buy-to-let with a long-term tenant can be. You're dealing with guest communications, check-ins and check-outs, cleaning turnovers, laundry logistics, pricing optimisation, listing management across multiple platforms, and maintenance requests. It's closer to running a small hospitality business than collecting rent.

And that's precisely where the strategy either thrives or falls apart.

The Simpler Path: Professional Short-Term Let Management

Here's the honest truth. The serviced accommodation model delivers outstanding returns, but only when it's executed properly. The landlords who struggle are the ones trying to self-manage: juggling guest queries at midnight, scrambling for last-minute cleaners, and constantly adjusting prices to stay competitive.

The landlords who thrive are the ones who treat it as what it is, a hospitality operation, and hand the day-to-day management to specialists.

This is exactly what Airhosts does. As a London-based short-term let management company, Airhosts handles every aspect of the operation: professional photography, listing optimisation, dynamic pricing, 24/7 guest communication, cleaning coordination, linen management, and regulatory compliance. You keep ownership and collect the returns. They handle everything else.

The difference between managing it yourself and partnering with a company like Airhosts is often the difference between a stressful side project and a genuinely hands-off income stream.

Why This Moment Matters

Opportunities like this don't come around often. The convergence of discounted new-build stock, rising corporate travel demand, and a maturing serviced accommodation market creates a window that rewards landlords who move decisively and set up properly.

But the window won't stay open forever. As developers clear their unsold inventory and prices stabilise, the entry discount narrows. The landlords who act now, securing the right units at the right prices and partnering with experienced operators, will be the ones capturing the best yields through 2026 and beyond.

Ready to Make Your Move?

If you're a London landlord or investor eyeing a discounted new-build and wondering how to unlock its full income potential, Airhosts can help you turn that opportunity into reality. From setup and furnishing guidance to full-service short-term let management, their team knows exactly how to position your property for maximum returns with minimum hassle. Get in touch with Airhosts today, and find out what your property could really earn.