Article
How build affects your rate
Reviewed July 2026
Insurers use build tables, not BMI
Underwriters work from height and weight charts specific to each insurer, not from a general BMI figure. Every carrier publishes its own build table, and they differ — the same person can land in different classes at different companies purely because of where the thresholds sit.
This is one of the more mechanical parts of underwriting: your height and weight are measured at the exam, the table is consulted, and a class results. There is less judgment involved than with most conditions.
Where the effect actually bites
Build affects which class you qualify for rather than whether you are insurable. Most people are written; the question is at what rate.
The thresholds cluster. Moving a few pounds either side of a table boundary can move you a whole class, which is why two people of similar build sometimes report noticeably different rates.
At the higher end of the tables, ratings become substantial and fewer carriers participate. There are insurers that specialise in higher-build applicants and their pricing is materially better than a generalist carrier would offer.
It is rarely assessed alone
Build is read alongside blood pressure, cholesterol, blood glucose, and family history as a combined cardiovascular picture. A higher build with excellent labs is a much better file than the same build with elevated blood pressure and pre-diabetic glucose.
This cuts both ways: if your build sits at the edge of a class but your labs are strong, some underwriters will take the better view. Good bloodwork genuinely helps here.
Does losing weight before applying help?
It can, but the timing matters and the answer is less encouraging than people hope.
Underwriters typically want to see weight stable rather than recently changed. Rapid recent loss can prompt questions rather than a better class — unexplained weight loss is a medical red flag, not a positive signal. Sustained loss held for six to twelve months is what reads well.
If you are actively losing weight and near a threshold, waiting a few months so the new weight is established is often worth more than applying immediately.
What does not work: crash dieting or dehydrating before the exam. Insurers see it, and it does not survive contact with the lab work.
Practical points for the exam
Schedule it for early morning. You will weigh less and your blood pressure will generally be better than after a day of stress.
Follow the fasting instructions exactly. Glucose and lipid results are meaningfully affected and those feed straight into the assessment.
If your weight has changed significantly for a documented medical reason, have that documentation available rather than letting the underwriter guess.
If you have been rated
Ratings for build are frequently reviewable. If you lose weight and hold it, many insurers will reconsider the rating on the existing policy without requiring a whole new application. Ask your carrier what their reconsideration process looks like — it is usually simpler and faster than requoting from scratch.
General information, not insurance advice. Product details change — confirm anything material directly with the carrier.