How to analyse a property deal in 60 seconds

The problem with gut feeling

Most people look at a property listing and make a snap judgement based on the photos, the price, and the location. That works fine when you are buying a home. It does not work when you are buying an investment.

Investment property is a numbers game. A beautiful cottage in the Cotswolds might be a terrible investment. A scruffy terrace in Middlesbrough might be an excellent one. The only way to know the difference is to run the numbers, every single time.

Professional investors screen dozens of properties a week. They cannot spend an hour on each one. They need a fast, repeatable process that surfaces the key metrics in minutes, so they can quickly decide whether a deal is worth pursuing or should be discarded.

Step 1: Check the yield first

Yield is the fastest way to filter out weak deals. Take the expected annual rent, divide by the purchase price, multiply by 100. If the result is below 5%, the deal needs exceptional capital growth potential to justify itself.

For a quick rent estimate, search Rightmove or OpenRent for similar properties in the same postcode. Look at what is currently listed, not what is already let, because listed prices reflect the current market.

If you are using BuildLink, paste the listing URL and the AI will pull comparable rents automatically. It checks against actual rental listings within a one-mile radius and adjusts for property size and condition.

A property at £200,000 with expected rent of £950 per month gives you a gross yield of 5.7%. That is workable. Below 5%, move on unless you have a specific value-add strategy like refurbishment or conversion.

Step 2: Estimate the true cost of entry

The purchase price is not what you actually pay. Your real outlay includes stamp duty (3% surcharge on additional properties), legal fees (typically £1,000 to £2,000), survey costs (£300 to £600), and mortgage arrangement fees (often 1% to 2% of the loan).

For a £200,000 buy-to-let purchase, your additional costs are roughly:

Stamp duty: £7,500 (at the additional property rates) Legal fees: £1,500 Survey: £400 Mortgage fee: £2,000 Total: £11,400

Add that to your deposit. If you are putting down 25%, your total cash in is £50,000 deposit plus £11,400 costs, which equals £61,400. That is the number you should use when calculating your return on investment, not just the deposit.

Step 3: Model the cashflow

Cashflow is what keeps you solvent between tenancies. A high yield property with negative cashflow will drain your reserves.

Start with the monthly rent. Subtract your mortgage payment, insurance, a management fee if you are using an agent (typically 10% to 12% of rent), a maintenance allowance (budget 10% of rent for older properties), and a void allowance (one month empty per year for cautious modelling).

If the number is positive, the deal cash flows. If it is negative, you are subsidising the investment from your own pocket every month. Some investors accept this if they expect strong capital growth, but it is a riskier position.

The metric lenders care about is DSCR, the debt service coverage ratio. It measures whether your rental income covers the mortgage. Most lenders want a DSCR of at least 1.25, meaning the rent must exceed the mortgage payment by 25% or more.

Step 4: Spot the hidden risks

Numbers that look good on paper can hide problems that only show up later. Here are the ones that catch investors out most often.

Short leases. If the property is leasehold with fewer than 80 years remaining, the cost of extending can be enormous, and mortgage lenders may refuse to lend. Check the lease length before you run any other numbers. See the eight-check leasehold playbook for the full screen.

EPC ratings. From 2028 (proposed), rental properties will need a minimum EPC rating of C. If the property is rated D or below, factor in the cost of upgrading, which can range from £5,000 to £20,000 depending on the work required. The full breakdown of MEES 2028 costs and exemptions is essential reading for any UK landlord right now.

Flood risk. Properties in flood zone 3 are harder to insure and harder to mortgage. Check the Environment Agency flood map before you get excited about a riverside bargain.

Japanese knotweed, subsidence history, non-standard construction, flying freehold, shared access, right of way issues. All of these can kill a deal or add significant cost.

BuildLink flags these risks automatically. The AI scans the listing description, photos, EPC data, and local environment data to surface warnings before you waste time on a site visit.

Step 5: Make a decision in 60 seconds

With those four checks done, you have enough information to make a screening decision. Not a buying decision. A screening decision.

If the yield is above your threshold, the cashflow is positive, the entry cost fits your budget, and there are no major red flags, the deal moves to your shortlist. If any of those fail, you move on.

The whole point of fast screening is volume. The more deals you screen, the more likely you are to find the ones that genuinely work. Most professional investors reject 95% of what they look at. That is not pessimism. That is discipline.

BuildLink was built for exactly this workflow. Paste a URL, get the full analysis in under a minute, and decide whether to pursue or pass. No spreadsheets, no manual data entry, no guessing at rent levels or refurb costs.