Thursday, 17 September 2026
It sounds logical that a bigger rental property should generate proportionally more rent. Add another bedroom, increase the monthly price, and the landlord receives a predictable return for providing additional space.
London does not work quite that neatly.
The latest ONS figures show that average private rent in London reached £2,332 per month in August 2026, with rental inflation rising to 3.5% over the year. Yet the relationship between size, location and rental value varies considerably across the capital.
For investors, this creates a more interesting question than simply asking which property commands the highest monthly rent. The better question is what tenants are actually willing to pay for each additional bedroom—and why.
An extra bedroom does not create the same value everywhere
Imagine two renters searching in London.
The first is a professional couple looking for a one-bedroom apartment near work. The second is looking for a two-bedroom property because both partners work from home and need additional space.
The second household may willingly pay significantly more for that additional room because it changes how they can use the property.
Now consider somebody comparing a three-bedroom and four-bedroom home. Their decision may involve children, schools, sharing arrangements, council tax, commuting and overall household affordability.
The additional bedroom still has value, but the pool of renters who need it may be different.
This is why landlords should avoid assuming that rental value increases in a perfectly straight line with floor area.
The tenant changes when the property changes
Bedrooms do more than alter the rent.
They can alter the entire target market.
A well-located studio may attract one type of tenant. A two-bedroom apartment may attract couples, sharers or small families. A larger house may appeal to families or groups of sharers, potentially bringing different management and regulatory considerations depending on how it is occupied.
That distinction matters for investment.
The landlord is not merely purchasing additional square metres. They may be entering a different section of the rental market.
Demand, turnover, furnishing requirements and management intensity can all change with it.
Location can make the same bedroom worth something completely different
This becomes particularly obvious when comparing boroughs.
Average London rent reached £2,332 in August, but local markets sit far above and below that figure. Kensington and Chelsea averaged £3,690, while Croydon averaged £1,582 and Newham £1,928.
A second bedroom therefore has no universal London value.
Its value is connected to the type of people searching in that area, the available housing stock, transport, local amenities and competing properties.
This is why a landlord considering conversion or refurbishment should be cautious about automatically creating the greatest possible number of bedrooms.
Sometimes a generous two-bedroom home can compete more effectively than a cramped three-bedroom property.
Floor area still matters when tenants walk through the door
Property portals naturally encourage renters to search by bedroom count.
Real life quickly exposes the limitations of that filter.
A bedroom technically capable of containing a bed may offer little useful storage or circulation space. A three-bedroom property with a tiny living room may feel less practical than a spacious two-bedroom home.
This matters particularly where landlords are considering alterations purely to increase the advertised bedroom count.
Rental properties need to work after the viewing.
If creating an additional bedroom destroys the communal space that made the property attractive, the theoretical increase in rent may come with a less attractive overall home.
The strongest investment may not have the highest rent
A four-bedroom property producing £3,000 per month generates more gross income than a two-bedroom property producing £2,200.
That does not automatically make it the stronger investment.
Purchase price matters. Financing matters. Maintenance matters. Licensing may matter. Tenant turnover matters. The amount spent preparing and managing the property matters.
The useful calculation is therefore not simply monthly rent.
It is the relationship between capital invested, operating costs, tenant demand and sustainable rental income.
London's rental market rewards space.
It simply does not reward every additional room in exactly the same way.
*DISCLAIMER- THIS PHOTO HAS BEEN TAKEN FROM PINTEREST*