Best BRRR analysis tools in the UK: who models the refinance

Four inputs and one output. The inputs: what you pay all-in, what the refurb costs, what the property is worth once the work is done, and the loan-to-value your refinance lender will offer against that figure. The output is money left in, and it is the only number that separates a BRRR from an expensive buy-to-let. A tool that stops at gross yield has not modelled BRRR at all; it has modelled the first R and gone home.

The fragile input is the end value. A software estimate of post-works value is exactly that, an estimate, and the surveyor your lender sends does not read anyone's dashboard. Whatever tool you pick, ask where its end value comes from and whether you can see the evidence behind it.

For the life of a BRRR deal after completion, Lendlord makes the strongest case on this page: portfolio, tenant and finance management as the core, deal and flip analysers alongside, and a permanently free tier, so testing it costs nothing. Two caveats from its own pages: its help centre states it does not currently cover Scotland, and it partners with PropertyData for estimates. Whether its analysers model your refinance case the way you would run it is a ten-minute test on the free tier, which beats anything this page can tell you.

PropertyData will not run your BRRR for you. Its Deal Analyzer does buy-to-let assessments, and the product's centre of gravity is local market data, valuations and comparables you interrogate yourself. For BRRR that is still valuable in one specific way: the end value you are underwriting has to be defended with sold comparables, and at £14 a month ex VAT with a 14-day no-card trial, this is the cheapest good source of that evidence here.

PropAI does a genuinely deep appraisal of a property you supply: a refurb estimate, stress tests, and a rating across four strategies, at £40 a month with a 5-day, single-property trial. Its pages do not name the four strategies, so before paying, check whether the refinance case you actually run is one of them.

DealFlow AI sits at the screening end: paste a Rightmove link, get a buy, maybe or avoid verdict with yield and cash flow, one free analysis a day with no account. It does not attempt the refurb costing or evidenced valuation a BRRR case rests on, and its pages do not pretend otherwise, which we rate. Use it to triage, not to underwrite.

PropDetect appraises every deal across six strategies, and BRRR is one of them. The refurb is costed room by room from the listing photos, the end value comes from comparable sold prices, rent is modelled, and the deal gets a strong, solid or avoid verdict, with every figure editable, so the refinance assumptions are yours to change when you disagree. Deal Radar can also watch Rightmove and appraise matches before you ever see them, which nothing else in this table does. Entry is £7.99 a month.

The limits are the ones we would flag on any automated model: the end value is an estimate from sold comparables, not a surveyor's opinion; the figures do not account for your lender's criteria, your tax position or early repayment charges on bridging finance; and hidden works no photo can show will move the refurb number. Treat the verdict as the start of your diligence.