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Edwardian terraced houses beside a London park in low golden sunlight, with the city skyline and the London Eye beyond
Photo: Francesco Albertazzi, Unsplash

A reason to leave their details, a reason to call.

Homeowners want a rough figure before they speak to an agent. Give them an honest range, built on official sold prices and energy certificate data, and turn their curiosity into a booked valuation with your team.

Built on official open data Honest ranges, not one magic number Every estimate leads to a person
Illustration with sample data. Built around your own records, brand and web address.

Tools that earn the enquiry.

Each tool gives the visitor something genuinely useful in a few seconds, then asks for the one thing you need: a way to follow up.

Instant sale estimate

A price range from recent sales nearby, using HM Land Registry sold prices for England and Wales, adjusted for the type and size of home.

Size and energy from the EPC

Floor area and energy rating read from the home's energy performance certificate, so the estimate starts from facts, not guesses.

Comparable sales shown

The sales behind each estimate listed with dates and prices, so the visitor can see where the figure comes from.

What could I let it for?

A rental range for landlords from official area rents and your own lettings, with a clear next step to a lettings valuation.

Yield and cash flow calculator

Price, rent, costs and borrowing in, gross and net yield and monthly cash flow out, for investors weighing up a purchase.

Stamp duty calculator

Stamp Duty Land Tax, or the Welsh and Scottish equivalents, worked out for the buyer's situation, including the higher rates for additional homes.

Leads where your team works

Every request lands in your CRM or inbox with the address, the estimate shown and the visitor's consent recorded.

Always ends with a person

Each tool finishes with a booked valuation or a call back, because the instant figure is where the conversation starts, not where it ends.

Your brand, on your site

Built into your own website in your colours, not sent off to someone else's page.

How the tools come together.

Small, focused tools, each placed where a visitor is most likely to need it.

Choose the tools

Sale estimate, rental estimate, calculators, or a mix, depending on whether you want vendors, landlords or investors.

Connect the data

Official sold prices, energy certificates and area rents, refreshed as each source publishes new figures.

Place them well

On your home page, your area guides and your landlord pages, in your brand and your words.

Follow up every lead

Requests go to the right branch with the details filled in, so the call back is quick and informed.

Built on official data.

We build these tools on open government data, used under its licences. We do not use scraped portal data, ever.

HM Land Registry Price Paid Data

Sold prices for homes in England and Wales, published under the Open Government Licence.

The EPC register

Floor areas and energy ratings from energy performance certificates, used to match like with like.

ONS private rents

Average rents by local authority from the Office for National Statistics, refreshed each month.

Your CRM or inbox

Leads delivered where your team already works, with the visitor's details and the estimate they saw.

A real map, from real data.

Average monthly rents by London borough from the Office for National Statistics, drawn on official boundaries. Hover or tap a borough.

Barking and Dagenham: £1,700 a monthBarnet: £1,953 a monthBexley: £1,540 a monthBrent: £2,018 a monthBromley: £1,693 a monthCamden: £2,834 a monthCity of London: no published figureCroydon: £1,586 a monthEaling: £2,126 a monthEnfield: £1,833 a monthGreenwich: £1,998 a monthHackney: £2,667 a monthHammersmith and Fulham: £2,861 a monthHaringey: £2,225 a monthHarrow: £1,781 a monthHavering: £1,567 a monthHillingdon: £1,581 a monthHounslow: £1,962 a monthIslington: £2,884 a monthKensington and Chelsea: £3,739 a monthKingston upon Thames: £1,821 a monthLambeth: £2,538 a monthLewisham: £1,832 a monthMerton: £2,181 a monthNewham: £1,931 a monthRedbridge: £1,734 a monthRichmond upon Thames: £2,349 a monthSouthwark: £2,516 a monthSutton: £1,569 a monthTower Hamlets: £2,462 a monthWaltham Forest: £1,772 a monthWandsworth: £2,640 a monthWestminster: £3,209 a month
£1,540£3,739average monthly rent, September 2026
£2,338

Average London rent, up 3.5% in a year

£1,406

Average UK rent, up 3.8% in a year

1Kensington and Chelsea£3,739+3.0%
2Westminster£3,209-0.4%
3Islington£2,884+6.6%
4Hammersmith and Fulham£2,861+4.9%
5Camden£2,834+1.4%
…24 more boroughs
30Sutton£1,569+2.9%
31Havering£1,567+0.9%
32Bexley£1,540+1.7%

Source: ONS Price Index of Private Rents, September 2026 figures published 21 October 2026. Official statistics in development. Borough boundaries: ONS, contains OS data © Crown copyright and database right 2024.

Good questions.

Anything else, ask us on the call.

How accurate is an instant estimate?
It is a range, not a valuation, and we say so on the page. It is based on recent nearby sales and the home's size, but it cannot see the new kitchen or the damp in the cellar. That is exactly why every estimate leads to a proper valuation with your team.
Where does the data come from?
Official open data: HM Land Registry sold prices, the energy performance certificate register and ONS rents, each used under its licence. We never use data scraped from property portals.
Does it work in Scotland and Northern Ireland?
Sold-price data from HM Land Registry covers England and Wales. Scotland and Northern Ireland have different sources, so for homes there we check what is available for your area before promising an instant estimate. Calculators work anywhere in the UK.
Will people really leave their details?
More people do when they get something useful first and the form is short. We ask only for what you need to follow up, explain how you will use it and record their consent.
Can investors use it without speaking to us first?
Yes. The calculators can be open to everyone, with an optional step to save the result or request a call. That is often how investors start a relationship with an agent.

Tell us how you work today.

A short call, your screen and ours. We listen to how your week runs, show you what we would build, and give you a fixed price in writing.

  • Built around your process, not a template
  • Hosted, looked after and improved by us
  • One UK studio from first call to launch

Prefer email? semir@bozmaps.com

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