Why is my house colder than my neighbour's?

What this usually means

Homes built or renovated at different times, or by different owners, can have very different fabric behind the same façade. One may have had cavity or loft insulation topped up, draughts sealed and windows upgraded, while the other was left as built; one may have an open chimney, worn seals or a poorly insulated extension the other lacks. Position matters too: an end-of-terrace or a corner has more exposed wall than a mid-terrace, a top-floor flat loses heat through the roof, and a more exposed aspect faces more wind-driven loss — so even genuinely similar homes can lose heat at quite different rates.

How the heating is run adds another layer — controls, thermostat settings, radiator sizing and balancing all affect how warm a home feels for a given fabric. Rather than trying to compare against a neighbour whose hidden fabric you cannot see, the productive step is to measure your own home: thermal imaging reveals missing insulation and cold bridges, a blower door test measures leakage, and a heat-loss assessment quantifies where the heat goes. That shows exactly why your home is colder and what to improve, regardless of what the neighbour did.

Common causes

Signs and symptoms

Two homes of the same size and shape can have very different total heat loss because that loss depends on the U-values of the elements (set by insulation), the air-permeability (set by sealing and window condition) and the exposed area and exposure (set by position) — none of which is visible from outside. A mid-terrace shares two walls with heated neighbours and loses heat only through the front, back and roof; an end-terrace or corner adds a whole exposed wall; a top-floor flat adds roof loss. Combined with differing insulation and airtightness, these produce real, measurable differences in how much heat each home needs to stay warm.

Because the determining factors are hidden, the reliable way to understand the gap is to measure your own home rather than infer from the neighbour's. Thermal imaging maps where insulation is missing or bridged, a blower door test quantifies the leakage, and a heat-loss assessment apportions the loss across the elements. That evidence shows precisely why your home is colder — more leakage, less insulation, more exposure, or poorer heating set-up — and what to improve, so you can close the gap with targeted works instead of guesswork.

How to find why your home is colder

Measure your own home's heat loss, leakage and insulation rather than guess from the neighbour's, then target the differences that make yours colder.

1. 01

   Image your home

   Use thermal imaging to find missing insulation and cold bridges.

2. 02

   Measure the leakage

   Run a blower door test to quantify draughts.

3. 03

   Assess the heat loss

   Apportion where your home loses the most heat.

4. 04

   Check heating set-up

   Review controls, radiator sizing and balancing.

5. 05

   Target the differences

   Insulate, seal and upgrade where your home falls short.

6. 06

   Verify the improvement

   Confirm the home is warmer for the same heating.

How to prevent it coming back

• Keep insulation and draught-proofing up to date.
• Account for an exposed position with extra insulation.
• Maintain window seals and controls.
• Measure rather than assume your fabric matches others.