How to Prepare Your Lancashire Home for a Heat Pump Installation
Proper preparation before a heat pump installation can save you hundreds of pounds in additional costs and ensure your system performs at its best from day one. Having managed heat pump installations across Lancashire for the past five years, I have seen how a well-prepared property leads to a smoother, faster installation and better long-term results. Here is a step-by-step guide to getting your home ready.
Step 1: Get a Heat Loss Survey Done First
Before anything else, you need a proper room-by-room heat loss calculation. This is not the same as an EPC assessment. A heat loss survey measures how much heat each room loses through walls, windows, floors, and the roof, factoring in the specific construction of your property. For Lancashire homes, where you might have anything from a solid-stone cottage in Trawden to a cavity-walled 1970s semi in Penwortham, the calculations vary enormously.
A heat loss survey costs £150-300 if done independently, though many qualified heat pump installers include it as part of their quotation process. The survey determines what size heat pump you need, which radiators (if any) need upgrading, and whether additional insulation is required before the heat pump can work efficiently.
Do not skip this step. An undersized heat pump will struggle to heat your home on cold days, while an oversized one will cycle on and off inefficiently, increasing electricity consumption and reducing the system’s lifespan. Getting the sizing right is the single most important factor in a successful heat pump installation.
Step 2: Address Insulation Gaps
Heat pumps work most efficiently in well-insulated homes because they operate at lower temperatures than gas boilers. Every gap in your insulation makes the heat pump work harder and costs you more in electricity. The heat loss survey will highlight any problem areas, but common issues in Lancashire homes include the following.
Loft insulation below 270mm: this is cheap and easy to fix. Topping up from 100mm to 270mm costs £300-500 for a typical three-bedroom house, or may be free through government energy efficiency schemes or the government insulation scheme. This single measure can reduce heat loss by 15-20% and is almost always recommended before a heat pump installation.
Unfilled cavity walls: if your Lancashire home was built between 1920 and 1990, it likely has cavity walls. If they are unfilled, cavity wall insulation costs £500-1,500 and reduces wall heat loss by roughly 35%. Again, grant funding is often available.
Solid walls without insulation: older Lancashire properties – particularly the stone-built terraces across East Lancashire and the Victorian villas in Preston and Lancaster – have solid walls that lose significantly more heat. Internal or external wall insulation costs £4,000-14,000 depending on the approach and property size. While not always essential before a heat pump installation, it makes a dramatic difference to performance and running costs.
Draughty windows and doors: even minor draughts undermine a heat pump system. Draught-proofing costs very little (£50-200 for a whole house) and should be completed before the installation. If your windows are single-glazed, secondary glazing or replacement double glazing will have a significant impact, though the cost is higher.
Step 3: Check and Upgrade Your Radiators
Heat pumps typically run at flow temperatures of 35-45 degrees Celsius, compared to the 60-75 degrees from a gas boiler. This lower temperature means your radiators need more surface area to deliver the same amount of heat into each room. The heat loss survey will identify which radiators are adequate and which need replacing with larger ones.
In many Lancashire homes built from the 1970s onwards, the existing radiators are already large enough because they were originally oversized for the property. Typical outcomes from heat loss surveys across the region show that 40-60% of radiators can stay as they are, 30-40% need upgrading to a larger size, and 10-20% of rooms may benefit from additional radiators or underfloor heating.
Upgrading a radiator costs £150-350 per unit including the new radiator, valves, and labour. For a typical three-bedroom Lancashire semi, upgrading 3-4 radiators might cost £500-1,200. This is best done at the same time as the heat pump installation to minimise disruption and plumbing costs.
Step 4: Plan the Hot Water Cylinder Location
If you currently have a combi boiler (no hot water tank), you will need to find space for a hot water cylinder. Heat pumps heat water gradually, so a stored supply is essential. A typical household needs a 200-300 litre cylinder, which stands approximately 1.5 metres tall and 0.6 metres in diameter.
Common locations in Lancashire homes include airing cupboards (if large enough), utility rooms, under-stairs cupboards, bedrooms (with an insulated jacket to minimise noise), or loft conversions. If you previously had a hot water tank that was removed when a combi boiler was installed, the original location often works well if the pipework routes are still accessible.
Plan this before the installer arrives. Clearing the chosen space, ensuring the floor can support the weight (a full 250-litre cylinder weighs approximately 280kg), and confirming access for the plumber will prevent delays on installation day.
Step 5: Prepare the Outdoor Unit Location
The outdoor unit needs a flat, stable base with adequate airflow around it. Minimum clearances are typically 300mm to the sides and rear, and 700mm-1 metre in front of the fan grille. For Lancashire terraced houses with limited outdoor space, this often means the back yard or side passage. For detached and semi-detached properties, the rear garden or side of the house is usually ideal.
The base can be a concrete pad (150mm thick), concrete paving slabs on a prepared sub-base, or proprietary mounting brackets that bolt to a wall. Your installer will specify the exact base requirements for your chosen unit, but preparing the ground in advance – clearing vegetation, levelling the area, or pouring a concrete base – saves time during the installation.
Consider the impact on your neighbours. Position the unit as far as practical from neighbouring bedroom windows. A 2-3 metre separation is ideal, though not always possible in tightly packed terraces across the BL, BB, and OL postcodes. Anti-vibration mounts and acoustic screening can mitigate noise if the unit must be placed close to a boundary.
Step 6: Upgrade Your Electrical Supply If Needed
A heat pump typically requires a dedicated electrical circuit, usually 16A or 32A depending on the unit size. If your consumer unit (fuse box) is old or has no spare ways, it may need upgrading. An electrician can assess this quickly and quote for any necessary work.
A consumer unit upgrade costs £400-700 and is a worthwhile investment regardless of the heat pump, as older units may not meet current safety standards. For older Lancashire properties with outdated wiring – common in pre-1960s housing across the region – the electrician may also recommend a wiring condition report to ensure the existing circuits can handle the additional load.
In most cases, the standard single-phase electricity supply (100A) is sufficient for a domestic heat pump alongside normal household loads. Only very large properties requiring 12kW+ heat pumps might need a three-phase supply upgrade.
Step 7: Apply for the government heat pump grant Grant
Government grants of up to £7,500 towards an air source heat pump must be applied for before installation begins, and the application is submitted by your qualified installer rather than directly by you. However, you need to have a valid EPC for your property before the installer can apply. If your EPC has expired or you do not have one, commission a new assessment (£60-100) well in advance of the planned installation date.
government grant scheme vouchers are currently being issued within a few working days of application, but this could change if demand spikes. Have the EPC and installer quote ready at least 4-6 weeks before your preferred installation date to allow for any administrative delays.
Installation Day: What to Expect
A typical air source heat pump installation takes 2-3 days. Day one usually covers positioning the outdoor unit, running pipe work into the house, and installing the hot water cylinder. Day two focuses on connecting the heat pump to the existing heating system, fitting controls, and making electrical connections. Day three (if needed) covers commissioning, testing, and setting up the controls and any smart features. You will have heating and hot water by the end of the process.
During installation, you may be without heating and hot water for a few hours while the changeover from your old system to the new heat pump happens. Planning the installation for a mild period – late spring through early autumn is ideal – minimises any discomfort during this transition.
Do I need to remove my gas boiler before the heat pump is installed?
Your installer will typically remove the old boiler as part of the installation. If you want to keep the gas boiler as a backup (a hybrid setup), discuss this with your installer during the quoting stage. Hybrid systems use the heat pump as the primary heating source with the gas boiler providing backup during the coldest weather. This can work well in poorly insulated Lancashire homes where full reliance on a heat pump would require extensive building fabric improvements.
How far in advance should I start preparing?
Allow 3-6 months from initial enquiry to installation. This gives time for a heat loss survey (2-4 weeks to arrange), any insulation work (4-8 weeks), the government grant application (1-2 weeks), and the installer’s scheduling (4-8 weeks lead time for popular installers). Lancashire installers tend to be busiest from September through December as homeowners rush to prepare for winter, so booking during spring and summer often means shorter wait times.
What if my property does not qualify for the government grant?
Properties must currently use fossil fuel heating (gas, oil, or LPG) and have a valid EPC to qualify. Social housing is excluded, but most owner-occupied and privately rented properties qualify. If you do not meet the criteria, you can still install a heat pump at full cost, benefiting from the 0% VAT rate. government energy efficiency schemes funding may also cover heat pump installation for eligible low-income households, providing an alternative funding route.
