Refurb yields: how to calculate your return before you buy

Yield on a refurbishment project is not the same as yield on a ready-to-let property. When you buy a property that needs work, you are not just buying a rental income stream. You are buying the right to create value, and the yield you care about is your return on the capital you put in, not a percentage of the market value you paid.

Most yield calculations developers use at deal analysis stage are too simple. They miss refurbishment costs, finance costs, and the difference between what the property is worth before and after the works. This is how you end up with a deal that looks like a 7 percent yield on paper but delivers 4 percent in reality.

This covers how to calculate refurb yields properly, which metrics actually matter depending on your exit strategy, and the numbers you need before you make an offer.

Gross yield vs net yield: the right starting point

Gross yield is annual rental income divided by the total property value, expressed as a percentage. If a property is worth £150,000 after refurbishment and achieves £900 per month in rent, the gross yield is £10,800 divided by £150,000, which is 7.2 percent.

Net yield accounts for the costs that run against the rental income: letting agent fees, landlord insurance, maintenance allowance, void periods, and ground rent or service charges on leasehold properties. A realistic annual deduction for these costs on a standard buy-to-let is 25 to 35 percent of gross rental income, depending on the property type and management arrangement.

On the same property, at a 30 percent cost deduction, net income drops to £7,560 and net yield against the £150,000 end value is 5.04 percent. That is the figure your refinance lender will stress-test your mortgage serviceability against, not the gross figure.

Both figures are useful but they tell you different things. Gross yield is a quick comparability measure across properties. Net yield is what you actually take home and what determines whether the refinanced mortgage is serviceable.

Why the refurbishment cost changes everything

If you buy a property for £100,000 and spend £35,000 refurbishing it, your total cost is £135,000. If the property is worth £150,000 after refurbishment, the gross yield against your total cost is 7.2 percent (same as the example above). But your equity in the deal is only £15,000 after costs, and if you refinance at 75 percent LTV, you get back £112,500 and you have released most of your original capital.

The yield calculation changes the moment you include the refurbishment cost. A property that looks like a good yield at market value may look very different once you add in the cost of the works, the finance costs during the refurbishment period, and the fees to exit the bridging loan.

This is why working off the end value alone is not enough. You need the full stack: purchase price plus refurbishment cost plus finance costs plus fees, compared against the rental income the finished property will generate.

Calculating return on equity for a BRRR deal

For a Buy, Refurbish, Refinance, Rent (BRRR) strategy, the yield metric that matters most is not gross or net yield against end value. It is return on equity: the annual net income divided by the cash you have left in the deal after refinancing.

Take the same example: £100,000 purchase, £35,000 refurbishment cost, £8,000 in bridging finance and fees. Total invested: £143,000. End value: £150,000. Refinance at 75 percent LTV: £112,500 released. Cash left in the deal: £143,000 minus £112,500 equals £30,500.

Net annual rental income at £7,560. Minus annual mortgage repayment on the £112,500 refinanced loan at 5 percent interest only: £5,625. Net annual income after mortgage: £1,935. Return on equity: £1,935 divided by £30,500 equals 6.3 percent.

That is the number that tells you whether the deal is worth doing on a BRRR basis. Not the gross yield. Not the yield against market value. The return on the capital you cannot get back out.

If you can find a deal where the refurbishment adds enough value that you refinance out all of your capital, the return on equity becomes infinite in mathematical terms. In practice, it means you have recycled your capital into a property that generates monthly income with none of your own money still deployed.

The numbers you need before you make an offer

To run a proper yield analysis before you commit to a purchase, you need five figures.

Purchase price. The price you intend to pay, not the asking price. These are often different.

Refurbishment cost. A realistic estimate built from a room-by-room schedule of works, not a guess. This is the number most developers underestimate, and underestimating it is how deals that looked profitable end up breaking even or worse.

Finance costs. Bridging loan interest, arrangement fees, exit fees, valuation fees. On a typical 9-month bridging facility, these add 8 to 12 percent of the loan amount to your total project cost. They are not optional and they are not small.

End value (GDV). What the property will be worth after refurbishment. This should be based on comparable evidence from actual sold prices within 0.5 miles and within the last 6 months, not estate agent estimates or optimistic assumptions.

Achievable rent. What the property will rent for in the local market, based on what comparable properties are actually achieving, not advertised asking rents. Check Rightmove and Zoopla sold/let data, not listings.

With those five figures, you can calculate gross yield, net yield, return on equity after refinancing, and whether the deal stacks at the purchase price you are considering.

Yield on HMO refurbishments

HMO refurbishments introduce additional variables that change the yield calculation materially. The gross rental income on a 6 bed HMO is significantly higher than on a single let of the same property, typically 30 to 60 percent more depending on the location and room configuration. But the costs are also higher.

HMO management fees run at 12 to 18 percent of gross income compared to 8 to 12 percent for single lets. Void rates are higher because individual room voids happen more frequently than whole-property voids, even though the impact per void is smaller. Maintenance costs are higher because of the volume of occupants and the higher wear on shared areas. And the compliance costs, including fire safety, licensing fees, and inspection requirements, add to the running cost base in a way that single let properties do not face.

The net yield on a well-run HMO is typically higher than on a comparable single let, but the gross yield alone overstates the advantage. Build the full cost stack, including the higher management and compliance costs, before comparing HMO and single let yields on the same property.

Yield vs capital growth: which matters for your strategy

Yield and capital growth are not the same objective and they rarely exist in the same property at the same time. High yielding locations tend to be those where property prices are low relative to rents, which is often because demand for owner-occupation is weaker. Capital growth tends to be stronger in locations where demand from buyers is high, which typically means yield is compressed.

For a BRRR strategy, yield matters because you are holding and refinancing. For a flip, neither yield nor long-term capital growth matters: what matters is the spread between total cost and sale price. For a buy and hold with a long-term outlook, the trade-off between yield and growth is a strategic decision that depends on your income requirements and your timeline.

Know which objective you are optimising before you start analysing deals. A deal that is excellent for one strategy can be poor for another on exactly the same property.

Running the numbers quickly on each property you view

The challenge with deal analysis is doing it fast enough to be useful before the property is gone. Properties that stack sell quickly. Spending three days building a spreadsheet after every viewing is not a viable process if you are viewing in volume.

The BRRR calculator runs the full return-on-equity analysis for a refurbishment deal in minutes: purchase price, refurb cost, finance costs, GDV, rental income, refinance amount, and cash left in. The flip calculator does the equivalent for a buy-refurb-sell deal.

Both tools work alongside the full refurbishment cost calculator, which builds the schedule of works that feeds the refurb cost line in the deal analysis. You get from viewing to decision-ready numbers in under 20 minutes.