Heat Pump Cost for a 3-Bed End Terrace: Full 2026 Breakdown

Across every house type in England and Wales, the median air source heat pump installation funded by the Boiler Upgrade Scheme cost £12,908 in April to June 2026, with a quarter of jobs under £11,128 and a quarter over £15,627 (DESNZ Boiler Upgrade Scheme statistics, Table Q1.1A). A 3-bed end terrace sits just under that median. On our model it needs an 8.5 kW heat pump, and in 2025/26 the median installation for a heat pump of that size was about £12,600. It is a small house by floor area with one party wall doing useful work, but an installation has fixed costs that do not shrink with the house. What pushes an individual end terrace up or down the range is almost never the bedroom count. It is the gable, and the radiators and cylinder behind it.

The three rows are the same house. Nothing changes but the fabric, and on our model the fabric moves the median installed price by £800 and the annual gas bill by more than £200. Use our heat pump calculator for an estimate that reflects your own insulation level and heating fuel.

Heat pump installations carry 0% VAT until 31 March 2027 (HMRC VAT Notice 708/6). Installed costs from DESNZ Boiler Upgrade Scheme statistics, Tables A1.3A and Q1.1A.

The spread across the middle half of jobs is largely the radiators, cylinder and pipework rather than the heat pump. If your radiators are already generous, your airing cupboard survived the combi conversion and your pipework is 15mm, you land near the bottom. If the house was replumbed in microbore, the cylinder went years ago and several radiators are undersized, you land near the top.

This is the comparison that brings most people to this page, and the honest answer is duller than the folklore. An end terrace is not a terrace with a small penalty, and it is not a semi in disguise. On our model, built on DESNZ NEED 2026 data, it lands almost exactly midway between the two, fractionally nearer the mid terrace than the semi.

Read the middle column rather than the house names. The gap from mid terrace to end terrace is 450 kWh of heat a year. The gap from end terrace to semi is 630 kWh. On gas at 7.97p per kWh and a boiler running at 90%, those gaps are worth about £40 and £56 a year respectively. That is the entire financial content of the phrase end terrace, and it is smaller than one bad month of thermostat habits.

What the table does not show is why the end terrace comes out below the semi at all, because on wall count they are identical. A semi has a front wall, a back wall, one flank wall and one party wall. So does an end terrace. The likely reason is footprint: a 3-bed end terrace is often a narrower, shallower house than a 3-bed semi, so it has less of everything, including less gable to lose heat through. If your end terrace is a wide one, or has a full-width rear extension, expect it to behave like the semi row rather than its own.

The gable is the flank wall at the end of the row. On most end terraces it is the largest single wall in the house: two full storeys, the full depth of the plot, usually running up into the roof void, and often with few or no windows to interrupt it. The front elevation of the same house loses a good share of its area to the door and windows. The gable has all of its area, all of the time.

In the typical case it costs you 450 kWh a year, about £40 on gas or £30 on a heat pump tariff, and that is genuinely not much. The reason the gable matters is not the average but the range. It is the one wall in the house whose construction you cannot guess from the street, and it is what decides whether your house sits in the middle row of the table above or the bottom one.

• Solid brick gable, pre-1919. Nine inches of brick, which the RdSAP 10 assessment method gives a default heat loss of 1.7 W/m²K against 0.7 for a filled cavity, so more than twice the loss for the same area, and worse in driving rain because wet brick conducts heat better than dry brick. Gables face the weather more than any other wall in a terrace, because there is nothing next door to shelter them.
• Unfilled cavity gable, 1930s to 1970s. The best-value fix in this guide. An empty cavity has a default of 1.5 W/m²K and a filled one 0.7, roughly half the loss. Check before you do anything else.
• Rendered or pebble-dashed gable. Render was often applied because the wall was already failing on damp. It tells you nothing about the construction underneath and everything about how the wall has been performing.
• Gable with a chimney breast. Common on older terraces, and an open flue in an unused breast lets warm air escape. The Energy Saving Trust puts the saving from draught-proofing an unused chimney at around £45 a year, and a chimney cap starts at about £150. Our draught-proofing guide covers it.

Move this house from the poor row to the typical row, which on an end terrace usually means dealing with the gable, the loft and the draughts together, and our model saves £90 a year on gas, £131 a year on a heat pump tariff, and £400 off the median installation because the unit drops a size. Go the whole way to the well-insulated row and it is £213 a year on gas, £272 on a heat pump tariff, and £800 off the installation.

Insulating a solid gable is a harder sell than the heat pump industry usually admits. The Energy Saving Trust puts whole-house solid wall insulation for a typical three bedroom semi, a similar size of house, at around £12,000 internally or £15,000 externally (updated 18 June 2026). Homes that had solid wall insulation in 2023 used a median 17.3% less gas the following year, about 1,857 kWh or £148 at the October 2026 price (DESNZ NEED impact of measures). Some homes save more, and many under-heated homes take part of the gain as warmth instead, but on those figures it does not pay for itself on fuel alone and nobody should tell you it does. It can still be the right thing to do before a heat pump, because it shrinks the heat loss the installer designs for. Because the gable is one large unbroken surface, ask for it to be priced separately rather than only as part of a whole-house quote. Our solid wall insulation guide covers the options.

On our model a typical 3-bed end terrace needs an 8.5 kW air source heat pump. A well-insulated one with an insulated or filled gable needs about 7 kW. One with a bare solid gable, a thin loft and some original glazing needs about 9.5 kW, the size a typical 3-bed detached house takes.

The number that decides it is not the bedroom count but the room-by-room heat loss calculation your MCS installer should produce. Every room is surveyed and its loss worked out at the design outdoor temperature for your location. On an end terrace there is one specific thing to check in that document: what U-value the installer has assigned to the gable. A survey that treats the gable as a filled cavity when it is nine inches of solid brick will undersize the unit and leave you cold in February. One that assumes solid brick when the cavity was filled years ago will oversize it, which costs more to buy, switches on and off more often, and runs less efficiently than a unit matched to the house. Ask to see the wall constructions listed in the heat loss report, not just the total.

If a quote arrives without a room-by-room calculation attached, it was sized by guesswork. On an end terrace that guesswork is riskier than on a mid terrace, because the gable is precisely the variable a rule of thumb cannot see. Our heat pump sizing guide explains how the size is worked out.

The 7 to 9 kW class covers most end terraces, so you will be quoted from a short and familiar list. Figures below are from each manufacturer's own pages and datasheets.

Outputs are the nominal ratings in each range that cover a 3-bed end terrace. Your heat loss calculation decides which one you need.

At this size the brands are close enough that the design, not the badge, decides the result. Ask for a design flow temperature of 50°C or lower, the seasonal performance the installer expects at that temperature in writing, and an MCS 020(a) sound calculation for the exact outdoor unit position. For a sense of scale, the whole system median measured across 428 homes in the Electrification of Heat trial was 2.78 units of heat per unit of electricity. The R290 units run hotter, which can save a radiator or two in an older terrace with awkward gable-wall rooms. Our heat pump noise guide explains what the decibel figures on the datasheet mean in a real garden.

A heat pump heats water to 40 to 50°C instead of the 65 to 75°C a gas boiler usually runs at, so each radiator has to be larger to deliver the same warmth into the same room. Several radiators in a 3-bed end terrace will usually need upsizing, and that work is part of the installed price rather than an extra.

Which ones is unusually predictable on an end terrace: the rooms against the gable. They have the highest heat loss in the house and, because their radiators were sized by a boiler installer with hot water to play with, they are frequently the ones already struggling on a cold night. If there is a room in your house that never quite gets warm in January, it is almost certainly on the gable, and it is the first radiator the heat pump designer will change. A double-panel radiator in the same wall slot usually solves it without losing floor space, which matters in a narrow house. Our radiator sizing guide explains how installers make that call.

You also need a hot water cylinder sized to how much hot water the household uses, and the Energy Saving Trust says it will usually fit a cupboard of at least 80 cm by 80 cm. End terraces built before the combi era usually kept an airing cupboard on the landing, and if yours survived the boiler swap it will usually take the cylinder. If it was ripped out to make an en suite or a wardrobe, you are back to the terrace problem of finding somewhere for it: the box room, a boxed corner of the back bedroom, or the loft, which needs boarding and a slimline cylinder that fits the hatch.

The common budget breaker is microbore pipework, the 8mm or 10mm pipe fitted in many terraces from the 1970s onwards. A heat pump moves more water at a lower temperature than a boiler, and narrow pipe can restrict it. Some systems can work with it: Octopus says its Cosy heat pumps work with microbore of 10mm or larger. Otherwise the runs to the upsized radiators are replaced with 15mm or 22mm pipe. Ask the installer to check pipe sizes during the survey rather than discovering it on installation day.

These figures use the Ofgem price cap for 1 October to 31 December 2026: electricity 26.32p per kWh and gas 7.97p per kWh. Gas rose 9% at this cap change while electricity barely moved, because VAT was removed from electricity for the winter, which is why a heat pump on a standard tariff now costs a little more to run than a gas boiler rather than clearly less. Electricity carries no VAT from October 2026 to March 2027 while gas includes 5%, so if 5% VAT returns to electricity in April 2027 at the same underlying price, the heat pump figures rise by 5%, which would cut the heat pump tariff saving against gas to £166 a year.

The tariff makes or breaks this. On a heat pump tariff you save £197 a year against gas, which is £3,940 over 20 years at today's prices, and capping the gas supply altogether saves a further £108 a year in standing charge. On a standard electricity tariff the heat pump costs £57 a year more than the boiler it replaces. That is not a large gap, but it is not a saving either, and it should not be presented as one. The case for a heat pump in an end terrace on the gas grid rests on moving to a heat pump tariff and scheduling around it. Our tariff guide shows how Cosy Octopus works out at about 18.7p per kWh with most heating in the cheap hours, and our running costs guide has the full comparison across every property type.

If your end terrace is all-electric rather than on gas, the picture is completely different and much better: see our electric boiler versus heat pump guide, because the £2,440 row above is what you are replacing.

Here is the result most heat pump content gets backwards. On our model, a harder-to-heat house does not make a heat pump save more money. It makes it save less.

Read the last column downwards. The saving falls from £215 to £197 to £156 as the house gets worse. Our model assumes a poorly insulated house needs a higher flow temperature to stay warm, and the Electrification of Heat trial found that heat pump efficiency falls as flow temperature rises, so the heat pump burns more electricity per unit of heat as well as needing more heat. On a standard tariff it is starker still: the well-insulated end terrace is £18 a year cheaper than gas, the typical one is £57 more, and the poorly insulated one is £151 more. The same trial found no significant difference in performance by the age of the house where an installer had judged it suitable, so treat the bottom row as a cautious case rather than a forecast.

The practical reading is that insulation is not a nice-to-have you do afterwards if there is money left. On an end terrace it helps decide whether the heat pump is a modest win or a modest loss, and the gable is where most of it lives. Our old house guide covers the order to do the work in, and underfloor insulation is worth pricing at the same time if you have suspended timber floors.

The Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump in England and Wales. Until March 2027 it pays £9,000 where the home is heated by oil or LPG and has no mains gas connection (GOV.UK), which is uncommon in a terrace. For a well-insulated end terrace at a median of £12,200, the grant leaves £4,700 to pay. Your MCS-certified installer applies for it, and since April 2026 the installer must take it off the price quoted to you.

The scheme was extended to 2030 in April 2026 and installations carry 0% VAT until March 2027. An end terrace qualifies exactly as any other house does, provided you own it and the heat pump replaces gas, oil, LPG or electric heating. Since April 2026 you no longer need a valid EPC to apply (Boiler Upgrade Scheme (Amendment) Regulations 2026), and outstanding loft or cavity wall recommendations have not blocked the grant since May 2024, though filling an open gable cavity first is still the cheapest way to shrink the heat pump. Read our BUS grant guide for the full eligibility rules, our grant checker for anything else you might qualify for, and our Warm Homes Plan guide for what replaces supplier-funded schemes from 2027.

Against a new gas boiler, about £3,500 for a three bedroom home according to DESNZ, including VAT, a typical end terrace pays £5,100 for the heat pump after the grant, about £1,600 more. At £197 a year on a heat pump tariff that is a payback of about 8 years. A job at the bottom of the range, £3,500 after the grant, costs no more than the boiler, so it is ahead from the first year; one at the top, £8,000 after the grant, is £4,500 more and takes about 23 years, longer than the 20 years the government assumes a heat pump lasts (Boiler Upgrade Scheme impact assessment, 2022). Where you land depends almost entirely on the radiator and cylinder work, not on the heat pump.

So the honest answer splits into two houses that happen to look identical from the pavement. An end terrace with generous radiators, a surviving airing cupboard and 15mm pipework costs little or nothing more than a new boiler, and the heat pump is clearly the better buy. An end terrace that needs several radiators, a loft cylinder and a replumb does not pay back on running cost alone within the life of the equipment. It is still a reasonable thing to do, but it is a choice about getting off gas rather than a financial decision, and it should be presented to you as one.

On a standard electricity tariff there is no payback at all in the typical case, because the heat pump costs about £57 a year more to run than the boiler. A heat pump tariff is a condition of the financial case, not a bonus on top of it. Against that, the government assumes a heat pump lasts 20 years and a gas boiler 15, so a like-for-like comparison over the equipment's life is kinder than the annual figures suggest. Run your own numbers with our boiler vs heat pump comparison, and read heat pump vs new boiler for the 15-year view.

Ground source is not worth considering here. It needs a borehole or a large ground loop, the median ground source installation under the Boiler Upgrade Scheme in 2025/26 cost £21,298 at 8 to 10 kW, and an end terrace garden rarely has the room. If your terrace is Victorian with solid walls throughout rather than just a solid gable, our Victorian terrace guide is the closer fit, and our 3-bed detached guide covers the step up if you are comparing house types before you move.

This is where an end terrace is genuinely easier than the house next door. A mid terrace has two neighbours, no side access and a rear yard in which almost no position is far from somebody's window. An end terrace has one attached neighbour, a gable that usually comes with a side passage or a strip of side garden, and a wall that no window of theirs faces.

In England an air source heat pump is permitted development only if the MCS 020(a) sound calculation shows 37 dB or less at one metre from the nearest habitable room window or door of each neighbouring property (MCS); Wales moved to the same MCS 020(a) test on 1 June 2026 (MCS). On an end terrace the only attached neighbour is on the far side of the house from the gable, so a unit on or near the gable is about as far from their windows as your plot allows, and it usually passes without an acoustic enclosure where a mid terrace in the same street may need one. At one metre the Grant Aerona 290 range runs from 40 to 46 dB(A) and the Ecodan Ultra Quiet 8.5 kW is 45 dB(A). The calculation uses the manufacturer's sound power figure rather than any quiet mode, so pick a quiet unit rather than relying on the setting, and set quiet mode for 11pm to 7am as well.

Three things do catch end terraces out. First, a gable that fronts a road. Outside a conservation area the unit can go on a wall facing a highway only at ground floor level; inside one it cannot go on that wall at all, or nearer the road than the house (GPDO Class G). The one metre boundary rule, which used to rule out many gables, was removed in May 2025. Second, the calculation counts every neighbouring habitable room window and door, upstairs as well as down and including the houses behind, so check the whole plot rather than just the attached neighbour. Third, the gable is where the gas meter box, the boiler flue and the soil stack usually are, so the space is less empty than it looks. Our planning permission guide covers the exceptions, including listed buildings.

Where the side is available, it is the best position in the house: a short pipe run to a cylinder on the landing, no fan pointing into your own kitchen window, and an unobstructed airflow along the passage. Tell your neighbour before the survey rather than after the delivery lorry arrives.

Get three quotes from MCS-certified installers and compare them on the design rather than the headline price. On an end terrace each quote should include:

• A room-by-room heat loss calculation with the design outdoor temperature stated.
• The wall construction assigned to the gable, stated explicitly, with the U-value used.
• The design flow temperature, ideally 50°C or lower, and the seasonal performance the installer expects at that temperature.
• A radiator schedule listing every emitter, which ones change and their new sizes, with the gable-side rooms called out.
• The cylinder size and exactly where it will go.
• An MCS 020(a) sound calculation for the proposed unit position, with each neighbour's nearest habitable window or door marked.
• The warranty on the unit and on the installation, and who you call when something fails.
• Confirmation that the Boiler Upgrade Scheme grant is already taken off the quoted price, as the scheme now requires.

Most end terrace installations take a few days, longer when most radiators are being swapped or the cylinder is going into the loft. Find installers through the MCS installer search.

Anti-vibration pads under the unit stop its hum reaching the party wall.

Heat demand from the DESNZ National Energy Efficiency Data-Framework (NEED) 2026, 39,502 gas-heated records, as implemented in this site's shared heat model. Installed prices from DESNZ Boiler Upgrade Scheme statistics, August 2026 release (Table A1.3A, median cost by capacity, 2025/26; Table Q1.1A, quartiles for April to June 2026). Heat pump efficiency from the Electrification of Heat Demonstration Project performance report (Energy Systems Catapult for DESNZ, December 2024). Measured insulation savings from NEED impact of measures (June 2026). Insulation costs from the Energy Saving Trust (cavity wall, solid wall, loft, draught-proofing). Default wall U-values from the RdSAP 10 specification. Energy prices from the Ofgem price cap for 1 October to 31 December 2026. Heat pump tariff from Cosy Octopus at October 2026 rates, as costed in our tariff guide. New gas boiler cost from the DESNZ Boiler Upgrade Scheme summary business case. Grant rules from GOV.UK. Permitted development rules from legislation.gov.uk and MCS. Heat pump and boiler lifetimes from the Boiler Upgrade Scheme impact assessment. Model specifications from Vaillant, Mitsubishi Electric, Daikin, Samsung, Octopus and Grant. Our full methodology explains how the model is built.