Reviewed by Thermorite UK technical review
About 2 min read 343 words
Last reviewed 25 September 2026. This guide provides general information; a survey remains specific to the individual property.
Section 01
Start with the pattern you have noticed
A room may feel colder at particular times, on one side of the property or compared with the spaces around it. That observation is useful, but it does not by itself establish why the difference is happening.
Make a short note of which room concerns you, when it feels different and whether you know of previous work to that part of the property. You do not need a technical diagnosis before requesting a survey.
Section 02
A wall cavity can be one part of a wider picture
Wall construction, windows, heating, ventilation, extensions and earlier work can all be relevant to comfort. Existing cavity insulation may be part of the conversation at some properties, while at others the accessible findings may not indicate that cavity work is needed.
Where access is suitable, a focused inspection can help explain what is visible at selected cavity points. It does not provide a view of every wall or prove a single cause for the room feeling cold.
Section 03
Use the survey request to describe the room in plain English
Select the cold-room concern in the request form, add the postcode and describe the part of the home that does not feel right. Any old documents or photographs are optional context, not a requirement.
Thermorite reviews the request before discussing whether a free visit can be arranged. The next conversation stays specific to the property and the accessible evidence.

At home
Start with what feels different in the rooms you use.
Temperature differences and comfort concerns can have several causes, which is why this guidance does not replace a property-specific assessment.
Start with a free surveyKeep exploring
Related guides
Continue with a closely related homeowner guide, or take the next practical step when you are ready.

What can a cavity survey show?
Understand the useful limits of an accessible inspection point.
Read the guide
Not sure what is inside your walls?
See how to start even when the property history is incomplete.
Read the guide
Start with the cold room
Use the survey request to describe the room and share the property postcode.
Start hereUseful answers
Questions about this guide
The answers stay property-specific and explain where an inspection has limits.
Free cavity surveys within 80 miles of Spalding
Concerned about existing insulation? Start with a free cavity survey.
Tell Thermorite what you are noticing and share the property postcode. The team will review the details, confirm eligibility and contact you about a visit.