A clear divide is beginning to emerge within prime London’s rental market as properties above and below £100,000 a year operate under different tenancy frameworks and show increasingly different patterns of rental growth.

Savills’ latest prime residential rental index shows that rents continued to rise during the second quarter of 2026, supported by limited supply and resilient demand across many of the capital’s domestic family markets. South West London recorded quarterly growth of 1.6%, while West London rents increased by 1.4%. Prime central London was more subdued, with average growth of 0.4% during the quarter.

Within prime central London, however, the headline average concealed a more significant difference. Properties renting for less than £100,000 a year recorded quarterly growth of 0.7%, compared with only 0.1% for higher-value homes. Across outer prime London, properties within the principal Renters’ Rights Act framework increased by 2.7% over the year, compared with 1.7% among homes above the threshold.

The distinction matters because a residential tenancy with annual rent above £100,000 cannot generally be an assured periodic tenancy. It therefore falls outside several of the principal tenancy provisions introduced across England on 1 May 2026, including the statutory assured-tenancy structure applying to most mainstream private rentals.

The difference does not create a simple division between regulated and unregulated property, nor does it mean landlords should automatically try to push rents above £100,000. Homes on either side remain subject to contractual, safety, deposit, discrimination and wider legal obligations.

It does mean that the annual rent can now influence the tenancy framework, possession strategy and way a prime residential investment is assessed. For landlords seeking to purchase, retain or refinance high-value London property, the rent should therefore be considered alongside valuation, debt structure and expected tenant demand rather than treated merely as an income figure.

Prime Rental Growth Remains Strongest in Domestic Family Markets

Savills’ figures show that prime rental growth remains concentrated in locations offering the space, schools and neighbourhood characteristics sought by domestic and internationally mobile families.

South West London led the capital during the second quarter, with areas such as Fulham and Wandsworth benefiting from continued competition for well-presented family homes. West London also recorded above-average growth, supported by demand in locations including Chiswick.

Prime central London’s more modest 0.4% quarterly increase reflects a market in which tenants are becoming increasingly selective. According to Savills, demand remains focused on best-in-class homes that offer clear value for money, while properties that appear overpriced or compromised are taking longer to let.

This creates a significant challenge for landlords at the highest rental levels. The strongest prime tenants often have substantial choice, corporate relocation support and the ability to compare London with other international cities. They may pay a premium for exceptional condition, security, service and location, but they are less likely to accept an ambitious rent simply because the property carries a prestigious address.

The slower growth above £100,000 may therefore reflect more than the tenancy distinction. It may also indicate the smaller tenant pool, greater price sensitivity and higher expectations operating within the super-prime rental market.

For lenders, this reinforces the importance of sustainable rental evidence. A property may be advertised at £9,000 or £10,000 a month, but the borrowing assessment will normally depend on the rent supported by current comparable evidence rather than the figure needed to place the tenancy outside the assured regime.

Why £100,000 Has Become a Material Legal Boundary

Government guidance confirms that a tenancy cannot be an assured periodic tenancy where the annual rent exceeds £100,000. Most qualifying private tenancies below the threshold moved into the assured periodic framework when the Renters’ Rights Act reforms took effect on 1 May 2026.

Under that framework, tenancies are generally rolling rather than fixed-term. Landlords must use the statutory possession grounds rather than Section 21, rent increases are subject to a prescribed annual process and landlords cannot accept offers above the advertised rent. The reforms also introduced restrictions on advance rent and additional protections for tenants with children or receiving benefits.

A tenancy above £100,000 normally sits outside that specific assured-tenancy regime. The relationship is governed more heavily by the contractual lease terms and the wider law applying to residential occupation.

That difference can give landlords greater contractual freedom, but it does not remove the need for careful drafting or legal advice. A high-value tenancy remains a substantial legal arrangement involving valuable property, significant rent and potentially complex termination provisions.

The practical issue for investors is that two neighbouring prime properties can now be similar in value, condition and tenant profile but operate under different tenancy structures because one rents for £95,000 a year and the other for £105,000.

That legal distinction may influence how the landlord manages the property, how a purchaser evaluates the income and how a lender considers the certainty and recoverability of possession.

The Market Is Not Rewarding Higher-Value Properties Automatically

Savills’ data does not show that properties above £100,000 are performing badly. Annual growth of 1.7% still represents an increase in rents.

It does show that homes beneath the threshold have recently generated stronger growth. That challenges any assumption that landlords can improve their position simply by moving a property into the higher-rent category.

A prime property must justify its rent through location, condition, size, services and current tenant demand. Where the market supports £90,000 a year, advertising at £102,000 in an attempt to alter the tenancy framework may reduce enquiries and lengthen the void.

The resulting loss of income can outweigh any perceived regulatory advantage.

A property empty for one month at £100,000 a year loses more than £8,300 of gross rent before service charges, utilities, council tax and agency costs are considered. An ambitious pricing strategy can therefore become expensive very quickly.

The landlord should also consider whether the tenant attracted at the higher level will expect greater flexibility, furnishings, maintenance support or termination rights. The contractual position may be different, but the commercial negotiating power does not automatically move in the landlord’s favour.

Lenders Will Use Sustainable Rent, Not Regulatory Optimisation

Specialist buy-to-let and commercial lenders assess whether the property’s income can support the proposed mortgage.

For conventional buy-to-let lending, this commonly involves an interest-coverage calculation under which the sustainable monthly rent is compared with a stressed interest cost. The precise calculation varies according to lender, product, ownership structure, fixed period and borrower profile.

Prime property creates additional complexity because rental yields can be relatively low despite substantial capital values. A £4 million London house producing £100,000 a year generates a gross yield of only 2.5% before management, maintenance, insurance and voids.

The property may be an attractive long-term asset, but the rent may not support the level of borrowing expected by the owner.

A lender will normally rely on the valuer’s assessment of market rent. It will not necessarily accept the asking rent, the rent previously achieved or the amount required to exceed the £100,000 threshold.

If the valuer concludes that the sustainable rent is £96,000, the mortgage calculation is likely to reflect that figure even if the landlord intends to advertise the property above £100,000.

This means tenancy strategy cannot be used to manufacture borrowing capacity. The finance must remain supportable under realistic market assumptions.

The Threshold Can Influence the Choice of Lending Market

Prime London rental property can sit between conventional specialist buy-to-let and commercial investment lending.

A straightforward high-value apartment held within an SPV may fit a specialist buy-to-let lender, provided the rent passes the required coverage test and the property meets criteria. A larger house with an unusually low yield may require a lender willing to consider the borrower’s wider income or assets.

Some private banks can assess the property as part of a broader client relationship, taking account of investment portfolios, liquidity and the overall balance sheet rather than relying solely on a standard rental stress test.

A commercial or bespoke lender may also consider the asset where the borrower is a professional investor, family office or corporate owner with a wider portfolio.

The most suitable route is therefore determined by more than whether the rent is above or below £100,000. The lender will examine loan size, leverage, borrower structure, property liquidity and the intended ownership period.

However, the tenancy framework remains relevant. The lender’s lawyers will need to understand the occupation agreement, possession rights and whether the structure aligns with the assumptions used in valuation and credit approval.

Prime Landlords Need to Separate Asking Rent From Financeable Rent

One of the risks within the current market is that landlords confuse three separate figures: the desired rent, the advertised rent and the financeable rent.

The desired rent is the amount the owner would like to achieve based on costs, return expectations or the property’s historic performance. The advertised rent is the figure used to test the market. The financeable rent is the level a lender and valuer are prepared to regard as sustainable.

Those figures may be identical, but they frequently are not.

A landlord refinancing a prime apartment may calculate the desired mortgage using a rent of £110,000. If comparable transactions indicate £95,000, the lender may advance substantially less than expected.

The gap can create a funding shortfall at the point an existing loan matures. The borrower may need to introduce capital, refinance other assets or accept a lower-leverage structure.

An early rental valuation can therefore be as important as the capital valuation. It allows the owner to understand whether the proposed rent is genuinely supported before the debt strategy becomes time-sensitive.

Properties Below the Threshold May Offer Stronger Current Demand

The stronger rental growth recorded beneath £100,000 indicates that this part of the prime market is currently benefiting from broader demand.

The tenant pool includes senior professionals, executives, internationally mobile families and affluent households seeking high-quality London accommodation without entering the very top rental tier.

These renters may be delaying purchases because of mortgage costs, tax uncertainty or a planned future relocation. Others value the flexibility of renting while establishing their long-term plans in the UK.

For landlords, the wider demand can support occupancy and rent growth, but the properties remain within the assured-tenancy regime where the relevant conditions are met.

That creates a trade-off. The asset may offer stronger income momentum, while the owner must comply with the new processes governing rent increases, tenancy information and possession.

This should not automatically make the property less attractive. Stable tenant demand and lower void risk can be more valuable to a lender than contractual flexibility attached to a property with a narrower market.

The investment case should therefore focus on net income and long-term liquidity rather than regulatory status alone.

Homes Above £100,000 Serve a Smaller and More International Market

Properties exceeding £100,000 a year tend to serve a narrower tenant population.

Demand can come from international executives, corporate relocation clients, diplomats, entrepreneurs, entertainers and UHNW families requiring substantial London accommodation for a defined period.

These tenancies can carry high gross income, but the landlord may experience longer marketing periods and greater dependence on relocation cycles, school calendars and international business conditions.

The property may also require a higher level of service and maintenance. Furnishing, security, gardens, staff accommodation and premium management can materially reduce the net return.

Where a corporate entity is the tenant, the agreement and credit assessment may differ from an individual residential letting. The landlord and lender need to understand who is contractually liable for the rent and whether the proposed occupation fits the relevant legal structure.

A high annual rent can therefore represent both a valuable income stream and a concentration risk. Losing one tenant can remove the entire revenue while the owner searches for another occupant within a relatively small market.

Corporate Letting Can Change the Analysis Again

Some prime properties are let directly to companies for occupation by employees or executives.

A genuine company let is not the same as an individual tenancy simply because the rent exceeds £100,000. The legal structure, repairing obligations, termination rights and deposit arrangements can differ significantly.

Corporate tenancies may appeal to landlords because the contractual tenant is a business rather than the individual occupier. However, the value of that covenant depends on the company’s financial strength and the wording of the agreement.

A lender may place substantial weight on a strong corporate tenant, particularly where the occupation is linked to an established multinational employer. It may treat a small or newly incorporated company very differently.

Landlords should avoid selecting a company-let structure solely because it appears to offer greater regulatory flexibility. The arrangement must reflect the actual occupation and be professionally documented.

For financing purposes, the lender and valuer must be told precisely how the property is let. Mischaracterising the tenancy can delay or undermine an application.

Personal and Corporate Ownership Still Require Separate Analysis

Many prime rental assets are owned through companies, trusts or family investment structures, particularly where the landlord is based overseas.

The £100,000 rent threshold does not determine whether personal or corporate ownership is preferable.

A company may allow profits to remain within the business and provide access to specialist limited-company lending. It can also create corporation-tax, extraction and administration considerations.

Personal ownership may offer a different mortgage market but expose the landlord to the individual treatment of finance costs and rental income.

Overseas and trust structures introduce further legal, tax and lender requirements. The lender may require personal guarantees, beneficial-ownership evidence and overseas legal opinions.

The ownership decision should therefore be made with tax and legal advisers using the intended holding period, succession strategy and borrowing requirements. It should not be driven solely by the tenancy threshold.

Valuation May Reflect More Than the Current Rental Figure

A prime residential investment can be valued in several ways depending on the property and likely purchaser market.

The lender may consider the asset’s value as an owner-occupied home, its investment value with the tenancy in place and the potential impact of the occupation agreement on a sale.

A well-located house capable of attracting owner-occupiers may retain strong vacant-possession value even if the rental yield is low. An apartment purchased primarily by investors may be assessed more heavily through income and comparable investment transactions.

The tenancy structure can affect that analysis. A purchaser may value contractual flexibility differently from the security of an assured tenant, while an existing tenant can either support income certainty or reduce the immediate buyer pool.

For a landlord planning to refinance and later sell, the valuer should understand whether the property is intended to remain an investment or return to the owner-occupier market.

The exit assumption can materially affect the acceptable leverage and loan term.

A Rent Close to the Threshold Creates Particular Uncertainty

Properties with sustainable rents close to £100,000 may require especially careful planning.

Market rent can move above or below the threshold as conditions change. A home achieving £102,000 during one tenancy may let for £98,000 at the next renewal or after a period of weaker demand.

The legal classification will depend on the actual tenancy and applicable rent rather than the landlord’s long-term intention for the property.

The mortgage should therefore remain viable on either side of the line. A borrower should not rely on the assumption that every future tenancy will stay above £100,000 or that regulatory treatment will remain unchanged throughout the loan term.

A lender may stress the rent below the threshold or use a more conservative figure where the comparable evidence is limited.

The landlord should also obtain legal advice before altering rent or tenancy terms in an attempt to change the applicable framework.

Refinancing Should Begin With a Prime Rental Review

The Savills figures create a practical reason for prime landlords to review their assets before a mortgage expiry or acquisition.

The first question is what rent the property can sustainably achieve in the current market. That should be supported by completed lettings and agent evidence rather than optimistic asking prices.

The second is what tenancy structure applies at that rent and how it affects possession, rent review and ongoing management.

The third is which lenders will recognise the asset, income and ownership structure. The answer may involve specialist buy-to-let, private banking, commercial investment finance or a blended structure supported by wider assets.

This review is particularly important for overseas landlords who may have limited visibility over current London tenant demand or the operation of the post-May tenancy regime.

A prime letting agent can advise on marketability and rent. A solicitor should confirm the legal structure, while the finance adviser assesses borrowing capacity and lender appetite.

Those decisions need to work together.

Prime London Is Becoming Two Related but Distinct Rental Markets

Savills’ latest data provides early evidence that the £100,000 threshold is becoming more than a technical legal boundary.

Properties below the line are currently recording stronger rental growth and serving a broader tenant market, but they fall within the central assured-tenancy framework where the statutory conditions are met.

Properties above the threshold generally sit outside that framework, potentially offering greater contractual flexibility while serving a narrower and more demanding group of tenants.

Neither category is inherently superior.

A lower-rent property may provide stronger occupancy, broader lender support and more dependable growth. A higher-rent asset may offer greater income and contractual flexibility but carry a lower yield, longer voids and more specialist finance requirements.

The error would be to assume that setting the rent above £100,000 automatically improves the investment or that remaining below the threshold necessarily weakens it.

For landlords and lenders, the sustainable rent, tenant demand, legal structure and long-term exit remain more important than the line itself.

The £100,000 threshold is starting to divide prime London, but the strongest assets will be those whose finance and tenancy strategy remain viable whichever side of that line the market ultimately supports.