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Streetcast: the rent forecast that stops at your street, not at your city.

Every published rent forecast in the UK averages thousands of streets into a single number. Your street is not the average. We forecast yours specifically.

Streetcast fuses the public signals that actually move local prices, transport changes, planning approvals, retail openings, school performance and council investment, into a 24-month forecast for a single street. Published indices such as the ONS House Price Index and the VOA private rental market statistics are built for context at borough and city level; Streetcast is built for decisions at street level.

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What is Streetcast and how does it differ from existing rent forecasts?

Streetcast is a hyper-local rent and value forecaster for UK landlords, investors, developers and commercial agents. It produces street-level rent and value forecasts that combine the public signals that actually move local prices, with honest confidence bands and the evidence shown alongside. It moves forecasting from the city level, where every published index sits, down to the individual street. It is in development; you can join the early-access waitlist today.

The averaging problem

A borough average describes neither of two streets it lumps together

City-level and borough-level forecasts are useful for context and useless for decisions on a specific property. They tell you the weather for the region. They cannot tell you whether it is raining on your street. The published number is an average, and an average is the one thing your street is almost never equal to.

Two streets four hundred metres apart can move in opposite directions over twenty-four months. One gets a new station within walking distance and a school that climbs an inspection grade. The other gets a betting shop where the bank used to be and a stalled regeneration plan. The published borough forecast averages them into a single figure that describes neither.

Streetcast separates them. It reads the public signals around each street, weights them, and forecasts the street on its own terms, with a confidence band that is honest about what the model can and cannot see. You get a forecast for your street, not for the thousands of streets it was lumped in with.

Context sources: ONS House Price Index (opens in a new tab), VOA private rental market statistics (opens in a new tab), and Department for Transport infrastructure announcements (opens in a new tab).

The five signal classes

The public signals that move a street

Every signal class is built on public, open data. Each card names the underlying sources.

Open data

Transport

Changes in how easily people can reach a street, sourced from Transport for London planning data, Department for Transport infrastructure announcements, and Network Rail timetable changes.

  • New station within walking distance approved or opened

    Transport for London planning data

  • Frequency increase on an existing line

    Network Rail timetable changes

  • Bus route changes affecting connectivity

    Local transport authority data

  • Active travel infrastructure (cycle lanes, low-traffic neighbourhoods)

    Department for Transport announcements

Open data

Planning

Major planning approvals and refusals within a defined radius, sourced from local authority planning portals and the Planning Inspectorate.

  • Large residential or mixed-use schemes approved nearby

    Local authority planning portals

  • Major refusals that protect existing character

    Planning Inspectorate

  • Change-of-use applications affecting the local mix

    Local authority planning portals

  • Section 106 contributions secured

    Local authority planning portals

Open data

Retail & Amenity

Changes to the retail and amenity mix on or near a street, sourced from Companies House registrations, licensing records, and local authority business rate registers.

  • New independent retail or hospitality openings

    Companies House registrations

  • Anchor store closures

    Local authority business rate registers

  • Restaurant and cafe density changes

    Local authority licensing records

  • Loss or gain of local amenities (post offices, pharmacies, GP surgeries)

    Local authority and NHS open data

Open data

Education

School performance changes that demonstrably move local property values, sourced from OFSTED and Department for Education public datasets.

  • OFSTED rating upgrades or downgrades for catchment schools

    OFSTED

  • New free schools opened

    Department for Education

  • Sixth-form and grammar performance moves

    Department for Education

  • Catchment boundary changes

    Local authority admissions data

Open data

Council Investment

Local authority commitments that signal area direction, sourced from council capital programmes, regeneration strategies, and public statements.

  • Town centre regeneration announcements

    Council regeneration strategies

  • Public realm investment

    Council capital programmes

  • New community facilities funded

    Council capital programmes

  • Housing strategy commitments specific to the ward

    Council public statements

See it work

Pick a street and watch the forecast assemble

Six fabricated streets, six fabricated forecasts, structured exactly the way the real product would output. Every forecast shows its confidence band, its driving signals, and how it moves when an assumption changes.

Illustrative data

Starting position

£2,650 pcm

Median rent

£845,000

Median value

62th

Rent percentile in borough

+6.1%

Rent trend (last 24m)

Active signals

6 found

  • A new cross-city rail station approved within an 8-minute walk, opening targeted for late 2027.

    Transport for London planning correspondence

    StrongPositiveMedium confidence

  • Daytime frequency increase confirmed on the existing line serving the street.

    Network Rail timetable change notice

    ModeratePositiveHigh confidence

  • Three independent hospitality openings within 200 metres over the last 12 months.

    Companies House registrations and local licensing records

    ModeratePositiveHigh confidence

  • Catchment secondary school moved up an inspection grade at its most recent report.

    OFSTED public dataset

    ModeratePositiveMedium confidence

  • A large residential scheme approved two streets away, adding footfall without overlooking.

    Local authority planning portal

    WeakMixedMedium confidence

  • Public realm investment committed for the adjoining high street.

    Council capital programme

    WeakPositiveMedium confidence

Streetcast 24-month forecast

+7.8%

Central forecast

+4.2%

Camden borough average

+3.6 percentage points above borough

24-month rent and value forecast for Sycamore Court, Camden. Central forecast +7.8 percent, with a confidence band from +3.8 to +11.8 percent at 24 months, against a Camden borough average of +4.2 percent.96101105110114Now6m12m18m24mMonths from todayIndex (today = 100)
Central forecastConfidence bandBorough average

Forecast assumes the proposed rail station holds its published opening timeline.

Indexed to today (today = 100). Central path is the model best estimate; the band is the modelled range.

What is driving this forecast

Test a scenario

View this forecast as a table
Indexed forecast for Sycamore Court, today equals 100. Central path with low and high confidence band.
MonthLowCentralHigh
Now100.0100.0100.0
3m98.7100.7102.7
6m99.1101.6104.1
9m99.7102.5105.4
12m100.4103.5106.7
15m101.1104.5108.0
18m102.0105.6109.2
21m102.9106.7110.5
24m103.8107.8111.8

Who it is for

Find yourself here

Buy-to-let Landlord

“I wish I knew whether to hold or sell my property next year.”

See whether your specific street is set to outperform or underperform the borough over the next 24 months. Sell into a forecast tailwind, hold through a forecast headwind. The signals that drive the forecast are shown so you can judge the assumptions yourself.

See pricing for this persona

Investor Evaluating a Sourcing Area

“I wish I knew which streets to buy on, not just which cities.”

Compare streets within a borough on like-for-like signal-driven forecasts. Allocate capital to the streets the published city forecast cannot distinguish. Stop buying the average.

See pricing for this persona

Developer Pricing a Scheme

“I wish I had a defensible rent assumption for my appraisal.”

Use Streetcast central forecast and confidence band directly in your appraisal. The forecast is signal-traceable, which means it stands up under interrogation by lenders and joint venture partners better than a flat percentage assumption.

See pricing for this persona

Letting Agent Supporting a Section 13 Rent Review

“I wish I had a forward-looking justification for the rent rise, not just backward-looking comparables.”

Pair Streetcast forward forecast with the Section 13 Evidence Pack in the Hartz Property AI Lab. Comparables establish the present market rate; Streetcast supports the trajectory. Tribunal panels respect evidence calibrated with confidence bands.

Section 13 Evidence Pack demoSee pricing for this persona

Commercial Agent / Surveyor

“I wish I could deliver street-level forecasts in a valuation report without a £15,000 research subscription.”

Use Streetcast as the forward-looking layer in your valuation. The output is signal-traceable, RICS-aligned in framing, and can be cited in a Red Book valuation with appropriate calibration.

Lease Abstraction demoSee pricing for this persona

What it is worth

Five decisions Streetcast changes

  1. The hold-or-sell decision

    You own a flat in an outer London borough and are weighing selling now versus holding for two more years.

    Streetcast surfaces

    Streetcast forecasts your specific street at +9% (confidence band +6% to +12%) over 24 months against a borough average of +4%.

    What you do

    You hold.

    What it is worth

    The borough average would have prompted a sell; the street-level forecast keeps you in, and the position is worth a five-figure capital gain at the central forecast.

  2. The two-postcode allocation

    You have £400k to deploy across two boroughs. Both look the same in published city forecasts.

    Streetcast surfaces

    Streetcast forecasts the two best candidate streets in each: Borough A at +6% (+4 to +8), Borough B at +2% (-1 to +5).

    What you do

    You allocate to Borough A.

    What it is worth

    The differential matters because the borough-level forecast is the same, but the street-level reality is not.

  3. The Section 13 forward-justified rise

    You are a letting agent serving a Section 13 notice with a rent rise of 7% in year one. The current Section 13 Evidence Pack supports it on present comparables. The tenant challenges on the ground that the proposed rent is materially above where the local market is going.

    Streetcast surfaces

    You pair the Evidence Pack with a Streetcast forecast showing the street at +8% (+5 to +11) over 24 months.

    What you do

    The forward justification supports the present proposal.

    What it is worth

    The tribunal upholds the rise.

  4. The developer appraisal that survived a lender review

    You are a small developer with a five-flat conversion appraisal. The lender flags the rent assumption as optimistic.

    Streetcast surfaces

    You replace the flat GLA average +3% assumption with a Streetcast street-level forecast (+5%, +3 to +7) showing the underlying transport and education signals.

    What you do

    The lender accepts the appraisal.

    What it is worth

    The deal proceeds.

  5. The commercial valuation defended at instruction stage

    You are a chartered surveyor pitching a portfolio valuation against two larger firms.

    Streetcast surfaces

    You include a Streetcast forecast layer for the three highest-value buildings, each with street-level central paths and confidence bands traceable to named public signals.

    What you do

    You win the mandate.

    What it is worth

    The Streetcast subscription cost less than a single billable hour.

Scenarios are illustrative. Streetcast outputs are forecasts, not guarantees. Confidence bands describe modelled uncertainty; actual outcomes will vary. Always use Streetcast alongside other due diligence, not in place of it.

Calibration of claims

What Streetcast is, and what it isn’t

What Streetcast is

  • A probabilistic forecast at street level, derived from public signals and calibrated against historic UK rent and value data.
  • Honest about uncertainty: every forecast is presented as a central path with a confidence band, never a single number.
  • Traceable: every forecast shows the signals driving it and their relative weights. You can interrogate the model, not just consume its output.
  • Updated continuously: as new signals arrive (planning approvals, OFSTED reports, transport announcements), forecasts recalibrate.
  • Aligned with RICS valuation principles in how it presents and bands its outputs.

What Streetcast is not

  • A guarantee. Forecasts are not promises. Markets move on factors no model can see.
  • A substitute for valuation, survey, or legal advice on a specific property or transaction.
  • A tenant screening tool. Streetcast never references individual occupants.
  • A trader signal. The product is built for property holders and analysts on multi-year horizons, not for short-term trades.
  • Infallible. We will publish accuracy data quarterly comparing previous forecasts against actual outcomes, so users can judge the product over time.

How to read a forecast

  • The central path is the model best estimate. Treat it as a midpoint, not as a prediction.
  • The confidence band shows the range within which the model expects the actual outcome to fall most of the time. Plan against the band, not just the path.
  • The signal breakdown shows what is driving the forecast. If you disagree with a signal interpretation, you can discount it manually.
  • Forecasts widen as the horizon extends. A 6-month forecast has a narrower band than a 24-month forecast. This is the model being honest about what it knows.

Streetcast is built and operated by Hartz AI. Our modelling reviewer is a RICS-registered surveyor or property economist, to be appointed before launch. Any concern about a specific forecast can be raised at hello@hartzai.com.

Pricing

Three tiers, one for each job

Illustrative price bands only. No firm prices while Streetcast is in development.

Single Property

From £29/mo

Homeowners and small landlords

For homeowners and small landlords. One street forecast updated monthly. Compare your street path against the borough. Designed for hold-or-sell decisions on properties you already own.

Join the waitlist for this tier

Portfolio

From £199/mo

Active landlords and investors

For active landlords and investors. Up to 25 streets, updated weekly. Cross-borough comparison. Scenario testing. Email alerts when forecasts shift materially. Built for ongoing portfolio rebalancing.

Join the waitlist for this tier

Professional

From £1,200/mo

Surveyors, agents, developers and family offices

For surveyors, agents, developers, and family offices. Unlimited streets, daily updates, API access, custom signal definitions, Red Book-aligned export. Replace the research subscription that runs into thousands a month with a calibrated product.

Join the waitlist for this tier

Early access

Join the Streetcast waitlist

Tell us a little about you and the streets that matter, and we will email you the moment Streetcast opens.

Common questions

Streetcast, answered

Who built this

Built by Hartz AI, reviewed for legal tone and modelling

  • Cyber Essentials certified. See our trust and security page.
  • Legal-tone review pending. Rivka Abecasis, our AI Compliance Lead and a UK GDPR specialist, signs off the legal tone of everything we publish.
  • Modelling reviewer to be appointed: a RICS-registered surveyor or property economist signs off the modelling and honesty claims before launch.
  • Hartz AI on Wikidata (opens in a new tab).

Where to next

Carry on through the property practice

ResiShield

The compliance and risk engine for the Renters Rights Act. The product holders reach for once they have decided to stay, sell or buy.

Explore ResiShield

Section 13 Evidence Pack

The Property AI Lab demo that builds a tribunal-ready evidence pack from present comparables. Pair it with a Streetcast forecast for the forward-looking layer.

Open the demo

Property AI Lab

Eight interactive AI demos for UK property professionals, with illustrative data and no sign-up.

Open the Property AI Lab

Talk it through

Book a Discovery Audit and we will point the analysis at your own streets and your own patch.

Book a Discovery Audit

Streetcast is in development. The descriptions on this page describe the product Hartz AI is building. All forecasts in the demo are fabricated illustrations using realistic structures. Streetcast outputs are probabilistic forecasts, not guarantees, not advice. Always use Streetcast alongside qualified professional judgement, not in place of it.