Mario Rizzo
President, Property-Liability at Allstate
Thanks, Tom. Let's start on Slide eight. Our comprehensive auto profit improvement plan is improving margins. Property-Liability earned premium increased 10% compared to the prior year quarter, driven by higher average premiums, which were partially offset by a decline in policies in force. The underwriting loss of $414 million in the quarter improved $878 million compared to the prior year quarter due to the improvement in our auto loss ratio. The chart on the right highlights the components of the 103.4 combined ratio in the quarter, which improved 8.2 points despite a 2.8 point increase in the catastrophe loss ratio compared to prior year. Prior year reserve estimates, excluding catastrophes, were $166 million unfavorable or at 1.4 point adverse impact on the combined ratio in the quarter. $82 million was attributable to the runoff property liability annual reserve review.
And $84 million in Allstate Protection primarily driven by national general personal auto injury coverages. The underlying combined ratio of 91.9 improved by 4.5 points compared to the prior year quarter and one point sequentially versus the second quarter of 2023 despite continued elevated severity inflation. Now let's move to Slide nine to review Allstate's auto insurance profit trends. The third quarter recorded auto insurance combined ratio of 102.1 was 15.3 points favorable to the prior year quarter, reflecting higher earned premium, lower adverse prior year reserve reestimates and expense efficiencies. As a reminder, we continuously assess claim severities as the year progresses. For example, last year, as 2022 developed, we increased current report year ultimate severity expectations, which influenced the quarterly reported trends.
While loss cost trends remain historically elevated, the pace of increase moderated in the third quarter. As Allstate brand weighted average major coverage severity improved to 9% compared to the 11% estimate as of the end of last quarter. The chart on the left shows the sequential improvement in quarterly underlying combined ratios from 2022 through the current quarter with quarterly reported figures adjusted to the full year severity level for 2022 and 2023 adjusted for current severity estimates as of the third quarter.
Higher average premium and the continued execution of our profit improvement plan drove the sequential improvement in underlying combined ratio to 98.8 as reported or a 100.5 in the bar graph when removing the 1.7 point favorable impact on the third quarter from improved severity for claims reported in the first two quarters of the year. The chart on the right portrays how our comprehensive actions are resulting in a higher proportion of the portfolio progressing towards or achieving target levels of profitability. Excluding the three large states, which generated 45% of Allstate brand auto underwriting loss in 2022, Allstate brand auto insurance underlying combined ratio was 97.2.
The Premiums from states with an underlying combined ratio below 100 improved to 59% of the portfolio in the third quarter, doubling from the percentage at year-end 2022 and up almost 10 points from 50% in the second quarter. Slide 10 shows the impact on policies in force from actions to improve profitability. Allstate brand rate increases have exceeded 26% over the last seven quarters. New issued applications shown in the middle chart, declined 19.5% compared to the prior year quarter, largely driven by actions to reduce growth in unprofitable states. California, New York and New Jersey combined declined 75% compared to the prior year.
Allstate brand auto policies in force decreased by 6% in the third quarter compared to the prior year, partially driven by the lower new business and also driven by lower retention due to rate increases. Elevated loss trends in Texas required implementation of rate increases of over 50% in the last 21 months. As a result, retention has declined, while profitability has improved. Policies in force in these four large states combined decreased by 8.7%, whereas the remaining states declined by 4.7% compared to the prior year through the third quarter. On Slide 11, we take a deeper look at the National General Auto book. While third quarter margins were impacted by $95 million of unfavorable non-catastrophe prior year reserve reestimates primarily across liability coverages.
The underlying combined ratio of 96.8 in the quarter and 95.7 year-to-date remains largely consistent with the prior year periods. Reflecting higher loss cost expectations given the reserve strengthening to date, offset by higher average premiums and expense efficiencies. The National General business as product, including fee-based revenue features and claims capabilities to accept in the nonstandard auto insurance market. As you can see in the chart on the right, 75% of the written premium growth in the third quarter of 2023 is coming from nonstandard auto, which is more profitable than the overall national general auto insurance business. Our new middle-market product, Custom 360, is now available in nearly 1/3 of the U.S. market and is also contributing to growth.
While the legacy National General and Encompass businesses, which will be run off as we implement custom 360, are having the lowest impact on growth. Slide 12 covers homeowners insurance results which incurred an underwriting loss in Q3, driven by higher catastrophe losses. On the left, you can see net written premium increased 12.1% from the prior year quarter. primarily driven by higher average gross written premium per policy in both the Allstate and National General brands and a 0.8% increase in policies in force.
Allstate Brand average gross written premium per policy increased by 13.2% compared to the prior year quarter, driven by implemented rate increases throughout 2022, and and an additional 9.5 points implemented through the first nine months of 2023. As well as inflation and insurance home replacement costs. The underlying combined ratio of 72.9 improved by 1.2 points compared to the prior year quarter, driven by higher earned premium, lower frequency and a lower expense ratio, partially offset by higher severity. We remain confident in our ability to generate attractive risk-adjusted returns in the homeowners business.
Slide 13 highlights progress on expanding customer access as part of transformative growth. We continue to enhance capabilities across distribution channels and are the only major carrier with competitive offerings and branded agent, independent agent and direct distribution. The exclusive agent channel represents the majority of Allstate's U.S. personal lines premium at approximately $32 billion or roughly 22% market share in this channel. Our exclusive agents continue to be a strength, offering personalized local advice customers value in this $145 billion market. While exclusive agent auto new business decreased by 5% overall, applications per agency, excluding California, New York and New Jersey has increased by 13.4% so far this year.
In addition, modifications to compensation have driven bundling at point of sale to an all-time high of over 75%. Agent performance continues to improve as they adapt to new compensation programs. We also have great growth potential through independent agents. The acquisition of National General strategically positioned Allstate to grow in the independent agent channel. National General continues to profitably grow nonstandard auto, while converting legacy Encompass and Allstate independent agent business onto their platform. Expanded nonstandard auto presence in 12 states represented 9% of National General's 12.9% increase in policies in force during 2023.
As we leverage Allstate's expertise in standard auto and homeowners, this channel should represent another source of profitable growth. The direct channel had a significant decline in new business volume this year since this was the most effective place to reduce new business volume and was the most impacted by the reduction in advertising. We have improved our capabilities in this channel, so it will be another source of growth moving forward.
And now I'll hand it over to Jess to discuss the remainder of our results.