How do online valuations work?

If you’re wondering what your home might be worth today, an instant online valuation can be a useful place to start. In just a few moments, it can provide an estimated value based on property data, local market activity and recent sales. 

But how does it actually work? And how much trust should you put in the result? 

Here’s everything you need to know about online property valuations, how Rightmove’s Instant Valuation works, and when you might need a different type of valuation.  

What is an instant online valuation? 

An Instant Valuation is an estimated property value calculated using property information and local data rather than by an estate agent or other expert. 

An online valuation analyses information about your property and compares it with local market activity. The result is a quick estimate of what your home could be worth in today’s market. 

Online valuations are designed to give homeowners a useful starting point. They’re free, fast and easy to access, making them ideal if you’re curious about your home, or another property’s, value, or are keeping an eye on the market before making your next move. 

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What information does an online valuation use? 

Online valuations rely on a combination of property data and local market information. 

Some of the main details used include: 

• The property’s location 
• Number of bedrooms 
• Property type 
• Property size 
• Key features and characteristics 

This information is combined with wider market signals, including: 

• Recent sold prices nearby 
• Properties currently for sale 
• Rental and sales activity 
• Search demand on property websites 
• Historical listing information 
• Estate agent marketing data 

The more reliable the information is about a property and its local area, the more confident the valuation model can be in its valuation estimate. 

How does the Rightmove Instant Online Valuation work? 

Rightmove’s Instant Valuation is calculated using industry-trusted machine learning models that combine public information, Rightmove data and information about similar nearby properties. 

The model uses two main approaches. 

1. Historic house prices, updated 

This method starts with a property’s previous sale price. The model then adjusts that historic value to reflect changes in local market conditions since the property last sold. 

2. Similar properties nearby 

This approach looks for similar properties nearby. The system will compare factors such as: 

• Bedrooms 
• Property type 
• Size 
• Features 
• Location 

Properties are scored based on how closely they match the home being valued. The online model then uses the most similar properties to help calculate a valuation. 

For this reason, homes that are surrounded by similar homes may be easier to value accurately than homes that are very different to other homes in the area. 

Bringing the results together 

The final instant valuation estimate combines the results from both models, along with an indication of uncertainty. This generates both the estimated value and the ‘valuation range’ shown alongside it. 

A confidence assessment is also applied. The less confident the system is in the result, the wider the valuation range given.  

If the model does not have enough reliable data to produce a trustworthy estimate, a valuation may not be shown at all. 

Are online property valuations accurate? 

Online valuations can provide a useful estimate, but they aren’t exact. Their accuracy depends largely on the quality and quantity of information available on the property. 

Generally, valuations tend to be more accurate for homes that are typical of their local area. 

For example, a standard two-bedroom terraced home in a neighbourhood full of similar properties is likely to have more data available for comparison. 

Properties that are more unusual can be harder to value accurately. This might include: 

• Architect-designed homes 
• Converted buildings 
• Luxury properties 
• Homes with unusual layouts 
• Properties with bespoke features 

In these cases, there may be fewer comparable properties available. This makes it more difficult for an automated model to estimate value precisely. 

In this case, your next best option for a quick valuation could be an Online Agent Valuation. This involves sending details to a local agent for them to assess your home’s value without the need for a home visit. 

Why is an online valuation given as a range, not a single number? 

Property values are never completely certain. Even professional surveyors and estate agents recognise that a home’s value can vary depending on market conditions and buyer demand. 

That’s why online valuations are sometimes shown as a range rather than a single figure. 

The range reflects the model’s confidence level in its estimate. A narrower range usually means there is more certainty in the available data. A wider range suggests more uncertainty. 

This allows homeowners to see not only the estimated value, but also how confident the model is in that estimate. 

What does an online valuation not account for? 

While online valuations can analyse a lot of data, there are some important things they can’t see. 

For example, an automated model generally can’t assess: 

• Interior decoration and presentation 
• Renovations completed since the property last sold 
• Home extensions 
• Loft conversions 
• Structural improvements 
• Damage or maintenance issues 
• The condition of your kitchen or bathroom 

Because of this, two apparently similar homes could have very different real-world values if one has been modernised and the other has not. This is why an online estimate shouldn’t be viewed as a substitute for a professional property appraisal by an estate agent. 

Why is my neighbour’s house valued differently to mine? 

This is one of the most common questions homeowners ask. Even neighbouring properties can have different values for several reasons: 

• Different numbers of bedrooms 
• Different floor areas 
• Extensions or conversions 
• Separate sale histories 
• Different property types 
• Unique features 
• Different market demand 

For example, two houses on the same street may look similar from the outside, but one could have an extended kitchen, larger garden or converted loft. 

A valuation model considers many factors beyond postcode alone, which is why neighbouring properties can receive different estimates. 

How often are Instant Online Valuation estimates updated? 

Property markets are constantly changing. To keep valuations as up to date as possible, Rightmove attempts to refresh Instant Valuation estimates every 30 days using the latest market information available. 

Sometimes a valuation may stay largely unchanged between updates. Other times, new information about the property or local area could lead to a more noticeable change. 

Users who track a property can view valuation updates in their My Rightmove account and choose to receive notifications when values change. 

Why can’t all UK properties get an Instant Online Valuation? 

Online valuations depend on having enough reliable property data available. At present, valuations can only be provided for properties where there is enough historic sales information. 

This includes many residential addresses in England, Wales and Scotland, but not every property. 

Some homes may not receive a valuation because: 

• There is not enough sales history
• The property has sold very recently 
• It is a new-build property 
• It is a commercial property 
• The address falls outside supported areas 
• The model lacks confidence in the available data 

When there isn’t enough information to generate a reliable estimate, it’s often better not to show one at all. 

Online valuation vs estate agent valuation: which should I use, and when? 

An online valuation is very useful for specific purposes. However, a local estate agent can visit your home, assess its condition and understand factors an automated model cannot see.  

That’s why an agent valuation will typically provide a more complete picture for when you’re ready to sell. You can read a more in depth look at the different types of property valuation here.

Use an online valuation when:  

• You’re curious about your home’s value  
• You’re monitoring market changes  
• You’re researching before selling  
• You want a quick estimate  
• You want to compare homes in your area 

Use an estate agent valuation when:  

• You’re preparing to sell  
• You’ve recently renovated your home  
• You’ve added an extension  
• Your property is unique or unusual, and there aren’t other properties it can be realistically compared against
• You need a detailed market appraisal 

Another alternative may be to get an Online Agent Valuation. This falls somewhere between an online valuation and an in-person agent valuation. 

To get an Online Agent Valuation, you provide details about your property and any recent photos which get sent to an agent. They will then draw on their local knowledge and expertise to provide an estimate which you’ll receive the next working day. 

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What should I do after getting an online valuation? 

Think of your online valuation as a starting point, not the final answer. To get the most value from it: 

• Track your property over time with MyRightmove 
• Sign up for monthly email price updates 
• Compare nearby sold prices 
• Look at comparable homes in your area 
• Use the valuation range rather than focusing on a single figure 
• Consider getting an estate agent valuation before listing your home 

Tracking your home’s estimated value over time can help you understand market trends and see how your property compares with others nearby. 

FAQs 

• How do online property valuations work? 

  Online property valuations use machine learning models and property data to estimate a home’s value. They analyse information such as location, property type, size, features and recent sales activity nearby.

• How accurate are Rightmove valuations? 

  In terms of an online valuation, which is an estimate of a home’s value, accuracy varies by individual property and area. Valuations are generally more accurate for homes that are typical of their local market and have plenty of comparable sales data available.

• Can I use an instant online valuation for a mortgage application?

  No. An online valuation is an estimate only and isn’t a formal valuation for mortgage lending purposes. Lenders will usually require their own valuation process. You can read more about mortgage lender’s valuations here.

• How accurate is an instant online valuation compared to an in-person estate agent valuation?

  An online valuation can provide a useful indication of value, but an estate agent can assess the property’s condition, presentation and unique features in person. For this reason, an estate agent valuation is typically more comprehensive and accurate.

• Can an online valuation take into account my extension or renovation? 

  Most online valuations will not take extensions or renovations into account. If improvements were completed after the property last sold, an automated model may not have access to that information.

  However, Rightmove’s Instant Online Valuation tool allows you to include renovations by tracking a property, then adding more detail about renovations you’ve made.

• Can I get an online house valuation for free? 

  Yes. Rightmove’s Instant Valuation provides a free online estimate, helping homeowners understand what their property could be worth today. You can also use the tool to track the value of other homes you’re interested in, and how that might change over time.

• Why doesn't my property have an online valuation?

  This usually happens when there isn’t enough reliable data available or the model lacks confidence in the estimate. Rather than showing a potentially misleading figure, no valuation is provided.

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