New research from Nationwide highlights how home improvements can significantly boost property values in 2025. According to analysis based on Nationwide’s House Price Index (HPI) data, major upgrades such as extensions or loft conversions that include a bedroom can increase a property’s value by as much as 24%. While these large-scale projects offer the biggest returns, the most popular improvements among homeowners over the past five years have been kitchen and bathroom renovations.
Commenting on the figures, Andrew Harvey, Nationwide’s Senior Economist, said:
“Our recent research found that kitchen and bathroom renovations were the most popular amongst homeowners who have made improvements to their home in the last five years, with 71% undertaking either, or both, of these. More than two in five (42%) added a bathroom or an ensuite, whilst 25% added an additional toilet.
“Of those undertaking work, around a third (34%) made green improvements to their property, with over half of these (56%) adding solar panels. As we explored in our recent special report on the housing stock, solar panels are becoming an increasingly popular feature, with nearly 1.5 million dwellings in England having photovoltaic (PV) panels, equating to nearly 6% of total dwellings (up from less than 3% in 2013).
“Younger homeowners appear to be most interested in greening their homes, with over two thirds (69%) of those aged 25 to 34 who had renovated in the last five years making green improvements. Older homeowners (those aged 55 or above) were least likely to have made green improvements (just 18%), with bathroom renovation being the most popular amongst this demographic (68% of those who had made improvements opted for this).
“Looking at other popular home improvements, 39% of homeowners who had renovated added an outbuilding, such as a shed or entertainment space, while 23% added a conservatory to their property. In terms of larger scale projects, 24% of those who had made improvements opted for a loft conversion, while 21% had a single storey extension built.
“The most popular reason for renovating was to make the property look nicer (54%), while 35% were looking to boost the value of their property, with the latter being the most important factor for younger homeowners. 32% of those surveyed made improvements to modernise the property to make it habitable, while 26% were looking to add more space. Interestingly, just 7% were renovating in preparation for a sale.
“Across all homeowners making renovations in the last five years, the average spend was around £52,000, although there was significant variation (as shown on the chart below), reflecting the range of work completed. Younger households (aged 25-34) tended to have a much higher average spend (c£97,000), reflecting that this group are more likely to have made more substantial improvements. Amongst older age groups, average spending was lower, with only a small proportion (c10%) of homeowners completing a major project such as an extension in the last five years.
Bedroom boost
“We’ve used our house price data to look at the factors that affect the values of homes as well as the potential to add value. While we can’t identify the value associated with kitchen and bathroom renovations, we are able to explore the impact of more substantial projects, particularly those which increase the size of the property.
“Location remains key to house values, but other factors, such as the number of bedrooms, are also important to homebuyers. Home improvements that increase the size of the property, such as an extension or loft conversion, remain a compelling way to add value.
“Having more useable space is generally thought to be consistent with better quality accommodation and people are prepared to pay for it. A 10% increase in floor space, all things equal, adds 5% to the price of a typical house. But our analysis suggests that it is additional bedrooms that are key to adding value. For example, adding space to create an additional double bedroom can add 13% to the value of an existing two-bedroom house.
“Homeowners that add a loft conversion or extension, incorporating a large double bedroom and bathroom, can add as much as 24% to the value of a three-bedroom, one-bathroom house.
“Our analysis suggests that, providing the room is useable, this can be a good way to increase the value of a property. The table below shows the value added for different property types by increasing floor area to accommodate an extra bedroom.
| Value added | 2 bed to 3 bed | 3 bed to 4 bed |
| Terraced | 13% | 10% |
| Semi-Detached | 14% | 10% |
| Detached | 17% | 13% |
Luxury or necessity?
“One of the questions homeowners may ask themselves before ringing the local builder is, ‘do we really need the space?’ As we identified in our recent housing stock report, more than half (53%) of owner-occupied properties in England are classified as ‘under-occupier’, that is to say they have two or more spare bedrooms.
“However, the increase in hybrid working means that some of these spare bedrooms are now more likely to be used as a home office or study. Additionally, many householders buy properties they intend to grow into over time, as their families expand and, probably more significantly given demographic trends, people remain in properties after their children fly the nest.
Energy efficiency
“Aside from extending, another way to add value is to make your home more energy efficient. Given cost-of-living pressures in recent years, energy costs remain a concern for many. Furthermore, decarbonising and adapting the housing stock is critical if the UK is to meet its emissions targets, given that residential buildings account for 15% of the UK’s greenhouse gas emissions5.
“Over the past ten years, energy efficiency has improved across the housing stock thanks to the higher efficiency ratings of newly built properties and improvements carried out on many existing homes, such as loft and cavity wall insulation. The latest data (2023) shows that over half (52%) of the housing stock is now rated ‘C’ or higher, up from less than a quarter (23%) in 2013.
“Ultimately of course, the decision to invest in a home is an individual one, which has to take into account the costs, hassle and time involved, as well as potential benefits.
“However, our survey suggests that most are pleased with the results. Just 4% of those we surveyed regretted renovating their home. Amongst those that did, the most common reasons for doing so were that the costs were too much and/or that the end result wasn’t what they wanted (cited by 41%).”
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