## What each portal is good for
Rightmove is strong for live listing coverage and agent notes. Zoopla can be useful for price history, area signals, and alternative stock discovery. The investor mistake is asking which portal is "best" in isolation. The better question is which data point each portal helps you verify.
For sale-price context, use official sources such as the [UK House Price Index](https://landregistry.data.gov.uk/app/ukhpi) and the ONS [House Price Index bulletin](https://www.ons.gov.uk/economy/inflationandpriceindices/bulletins/housepriceindex/latest). Portal asking prices are not the same as completed sale prices.
## How to use portal data safely
Use portals to collect:
- Asking price and reduction history.
- Comparable listings.
- Agent comments about condition, tenure, and chain.
- Floor area, EPC, and lease clues.
- Rent comparables where listed.
Then verify the assumptions elsewhere. Asking rent should be checked against comparable listings and local demand. Purchase price should be checked against sold evidence. Works should be checked through viewing, survey, and contractor pricing.
## Worked example
A listing shows a 210,000 asking price and suggested rent of 1,250 per month. Gross yield is 7.14 percent before costs. If actual rent is 1,150 and operating costs are 2,400 per year, net yield falls sharply. If the property also needs 12,000 of works, the offer ceiling may be lower than the listing makes it feel.
That is why portals belong at the start of underwriting, not the end.
## Better workflow
Import or record the portal assumptions, then label each as unverified, supported, or confirmed. A clean model should make uncertainty visible. When the portal, official data, broker view, and viewing notes disagree, the safest assumption wins until better evidence arrives.
## What to save in the model
For this zoopla vs rightmove for deal screening check, save the source links, date checked, calculator inputs, base case, downside case, professional question, and final pass or proceed decision in the deal notes. Also save who verified each assumption: broker, solicitor, council, insurer, accountant, or your own viewing notes. The article should not be the evidence itself. It is the checklist that tells you which evidence to collect, where to link it, and which calculator result changed the decision. For live deals, rerun the model whenever one assumption changes. If the answer changes, update the offer price before sharing the pack. Keep rejected assumptions visible too.