From Guildford to Woking: How Surrey's Older Homes Are Adapting to Renewable Heating

Surrey has no shortage of period charm. Georgian townhouses in Guildford, Victorian semis in Woking, sprawling farmhouses tucked into the Surrey Hills, the county is full of homes that were built for open fires and single glazing, not modern heating technology. So when a wave of homeowners started asking whether their old houses could actually run on an air source heat pump, the honest answer was: yes, but it takes a bit more thought than a straight boiler swap.

Here's how Surrey's older homes are making the transition work.

1. Insulation Is Coming First, Not as an Afterthought

The biggest shift in how Surrey homeowners approach renewable heating isn't the heat pump itself, it's what happens before installation. Older properties with solid walls or draughty lofts are increasingly getting insulation upgrades ahead of any heat pump quote, often through installers registered with TrustMark, the government-endorsed quality scheme covering retrofit and insulation work, since a heat pump performs best in a well-insulated home rather than one leaking warmth through single-glazed sash windows.

2. Local Installers Are Learning the Quirks of Surrey's Housing Stock

Air source heat pump specialists such as Air to Heat, who install across Surrey, have built up detailed knowledge of how the county's older properties respond to lower flow temperatures, informing decisions on emitter sizing and system design specific to solid-wall and period homes. That local knowledge matters more than people expect. A heat pump specified for a new-build estate in Woking won't necessarily suit a 1930s semi three streets away.

3. Radiators Are Getting Bigger, Not Replaced Entirely

One of the more persistent myths is that switching to a heat pump means ripping out radiators and installing underfloor heating throughout. In practice, many older-home retrofits simply involve upsizing existing radiators to work efficiently at lower flow temperatures. Design-focused installers like Elite Renewables, based in Croydon and serving the wider South East, have built their reputation on exactly this kind of careful emitter sizing rather than a one-size-fits-all install.

4. Homeowners Are Leaning on Nationwide Expertise for Tricky Properties

For particularly complex retrofits, some Surrey homeowners are turning to installers with broad national experience across varied housing types. Renewafuel, which installs Mitsubishi Ecodan heat pumps across mainland Britain and backs every install with a 10-year performance guarantee, has built a reputation for handling the kind of mixed insulation and awkward layouts common in older housing stock. It's a useful option when a property doesn't fit the standard template.

5. Independent, Design-Led Installers Are Gaining Ground

There's also been a shift toward installers who prioritise system design over simply fitting the cheapest available unit. Heat Geek, a nationwide network of independently vetted installers, has built its reputation on detailed heat-loss calculations and low-flow-temperature design, exactly the kind of careful planning that older, harder-to-heat homes tend to need.

6. The Government Grant Is Smoothing the Decision for Many

Cost has always been the sticking point for retrofitting an old house, but the Boiler Upgrade Scheme, administered through GOV.UK, currently offers eligible homeowners a grant toward the cost of an air source heat pump installation. For Surrey's older properties, where retrofitting can involve extra groundwork, that grant is often the difference between a homeowner going ahead or shelving the idea for another year.

7. Word of Mouth Is Doing a Lot of the Persuading

Perhaps the most telling trend of all is how much of this shift is happening through neighbours talking to neighbours, backed up by online reviews. Installers with strong regional reputations, such as Guscott Heating in Kent, have grown largely on the strength of word of mouth and consistent customer feedback rather than advertising. Once one house on a Guildford street has a working heat pump through a cold snap, the scepticism next door tends to soften fast.