London 1-bed at £354,900 with £1,108 monthly rent: does it stack up?

J

jade_details

Property investor
Established
I’m assessing a London 1-bed apartment priced at £354,900, with expected rent of £1,108 per month. That gives a headline gross yield near 3.7%.

My conservative model uses eleven months of rent and deducts management, routine maintenance, vacancy and a reserve for one larger repair. The building appears sound, but the remaining lease length could materially change the result.

Which London cost am I most likely to be underestimating? Is my repair reserve likely to be doing too much work, and what net yield would compensate you for the risks here?
 
Service charge and communal major works would be my first concerns. An internal repair reserve does not cover a new roof, lift work or other building-wide spending. Before judging the yield, get the remaining lease term, current service charge, ground rent terms and any information about planned works.
 
That is the gap in what I have. I don’t yet have the lease details, service-charge history or planned-works information. I had treated those as later due diligence, but the numbers are thin enough that they need to be the first filter. I’ll keep the internal repair reserve separate from communal costs.
 
How firm is the £1,108 rent? Is it based on completed nearby lettings for comparable 1-beds, or simply an advertised figure? Also compare like with like on furnishing, condition and exact location. A small rent overestimate matters when the starting yield is already low.
 
Using eleven months gives £12,188 annual rent. Dividing that by £354,900 produces about 3.43% before management, service charge, insurance, maintenance or any financing. So the conservative vacancy assumption has already moved you well below the 3.7% headline.
 
One vacant month is not the whole turnover cost. A tenant change can also involve cleaning, minor decoration, inventory work and a letting or renewal fee depending on how it is managed. Keep turnover as its own occasional expense rather than hiding everything inside vacancy.
 
Check exactly what insurance is included through the building and what remains yours to arrange. You do not want to double-count the building policy, but nor should you assume it covers the apartment’s contents, rental risks or every loss you have modelled.
 
If borrowing is involved, test the cash flow at more than one interest rate and with no rent increase. A deal can show a modest property-level return while still requiring monthly cash contributions after financing. The loan terms may matter more than fine-tuning the repair reserve.
 
I would not assign a value to the flat until the lease length is known. If it may need extending during the intended holding period, obtain a specific estimate rather than using a generic allowance. The apparent discount could simply reflect that future cost and uncertainty.
 
There is no universal net yield that compensates for this. I would compare the return after all recurring costs with a lower-effort use of the same capital. Expected London price growth should be a separate scenario, not the assumption that rescues weak cash flow.
 
Remember costs outside the monthly operating statement. Purchase taxes and other acquisition expenses depend on the buyer’s circumstances, while council tax and utilities may fall to the owner during some void periods. Those details are jurisdiction- and council-specific, so price them rather than assuming zero.
 
I slightly disagree that eleven months must be the right conservative answer. Run twelve, eleven and ten months instead. The recurring service charge could be a bigger drag than vacancy, while a turnover event can be modelled separately. Scenarios reveal more than one blended percentage.
 
Agreed with Lena. I’d build a simple annual statement: collected rent, management, service charge, ground rent if applicable, insurance, internal maintenance, turnover, void holding costs and communal-work reserve. Only then calculate net yield. At present, too many leasehold costs are sitting outside the 3.7% figure.
 
Also be consistent about the denominator. Yield on the £354,900 purchase price is useful for comparing properties, but return on your actual cash committed should include relevant acquisition and financing costs. They answer different questions, so label both rather than mixing them.
 
The building looking sound is reassuring but not enough. Expensive communal work can be planned before visible deterioration appears. Ask for recent service-charge accounts, the current budget, the reserve-fund position and any notices or correspondence about anticipated works.
 
At 3.43% after the assumed vacant month but before the other expenses, I would not choose a target net yield yet. First calculate what remains. If normal service charges and management consume most of the return, no minor adjustment to the maintenance reserve makes the deal attractive.
 
A useful stress grid would combine lower collected rent, higher routine maintenance, one tenant change and a financing-rate increase if relevant. Then add a separate major-works case. If the investment only works in the cleanest column, that tells you more than the average forecast.
 
The rent evidence still needs resolving. Two apartments in the same area can achieve different rents because of layout, floor, light, condition or furnishing. I would want several genuinely comparable listings or completed lettings, not a broad area average, before accepting £1,108.
 
Zoe, I would pause until the lease and building figures arrive. The key unknown is no longer whether your internal repair reserve is slightly light; it is whether service charges, lease terms and communal exposure change the investment completely. A tidy-looking building cannot answer those questions.
 
My practical sequence would be: verify achievable rent, confirm lease length and ground rent terms, obtain service-charge history and planned-works information, then rerun twelve-, eleven- and ten-month rent cases. Add financing last so you can distinguish a weak property return from a workable property made weak by debt.
 
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