DealStackDealStack
V5 · developer-grade underwriting

UK property deal analyser. Test the deal, not someone else's opinion.

Enter a property you are already considering. DealStack models buy-to-let, BRRR, HMO, flip and rent-to-rent outcomes against assumptions, evidence and financial constraints you control.

DealStack is an analytical calculator, not a property sourcing or brokerage service. It does not find, rank, recommend, introduce, negotiate, advertise or transact properties. You choose the property and supply the information to analyse.
Strategy templates

Property you selected

Your financial constraints

Calculated outcomes

All outputs are deterministic calculations from the figures above. Tax treatment and personal circumstances are excluded.

Capital remaining
after modelled refinance
Monthly cash flow
after selected operating allowances
Gross yield
Flip profit
Cash invested
Cash recycled
True gross yield
rent ÷ total acquisition basis
ROCE
annual net income ÷ cash invested

Constraint price

Highest modelled purchase price at which all of your constraints above remain satisfied

Downside scenarios

Five and ten-year outlook

Deterministic projection using your annual rent growth, cost inflation and property appreciation assumptions.

Break-even rent
Profit on cost
Year 5 equity
Year 10 equity
YearRent / monthCosts / monthNet / monthProperty valueDebtEquityCumulative net

Purchase-price sensitivity

PriceCapital remainingCash flowYieldFlip ROIConstraints

Sold comparable evidence

Add comparable evidence you have obtained independently. DealStack summarises it; it does not search for properties or act for you in a transaction.

ComparableValueSimilarity
Median
Range
Evidence strength

Rental comparable evidence

ComparableRentSimilarity
Median
Range
Evidence strength

Evidence classification

Value · inferredDerived only from comparable values you enter.
Rent · inferredDerived only from rental evidence you enter.
Condition · unknownRefurbishment remains your allowance until a separate condition-estimation feature is validated.

Operating assumptions

Transaction assumptions

Transaction tax uses current residential bands for the selected UK nation and additional-property status. It is a planning estimate; reliefs and personal tax liabilities are outside this model.

Finance and timing

Room-by-room income

Use for HMO, multi-let or mixed room rents. Apply the total to the deal calculator.

Regional refurbishment planner

Select a baseline, then overwrite the total in the deal calculator.

Saved deal comparison

Each row is a local snapshot of a property you chose to analyse. Sort and compare without DealStack ranking or recommending properties.

Actual vs underwrittenScenario / exit matrix
PropertyStrategyStatusPriceNet / monthCash investedCash recycledTrue yieldROCE
DealStack V5 · Self-service property underwriting · No sourcing, recommendations, introductions, negotiation or transaction handling · Not financial, legal, tax or surveying advice.
Pricing · Methodology · Privacy

UK property deal analysis without the spreadsheet

DealStack is a property investment calculator for UK investors who want to model a specific deal using their own assumptions. It combines acquisition costs, finance, rent, operating expenses and downside scenarios so the headline yield is not the only number you see.

Buy to let
Model monthly cash flow, gross and net yield, cash-on-cash return, LTV and interest coverage.
BRRR
Model refurbishment, refinance value, refinance LTV, capital remaining and cash recycled.
HMO
Model room-by-room income, occupancy, operating costs and professional property criteria.
Stress testing
See what happens when rent, rates and values move against your base assumptions.

Explore focused tools: UK property deal analyser · Buy-to-let calculator · BRRR calculator · HMO calculator · calculation methodology · pricing.