increases exceeded our expectations and as a result we announced a price increase on our interior solutions plus an adjustment to our freight charges, resulting in an overall increase of approximately 6.5%, effective November 16, 2021. We believe that, despite the price increase, we remain highly cost competitive within the context of rising costs of conventional construction.”
Mr. O’Meara concluded, “When we unveiled our strategic plan in November 2019, we articulated financial targets to be achieved by the end of 2023. Two years into the execution of the plan, we are pleased with the steps we have taken to transform the company from both an operational and commercial perspective and continue to strongly believe that the targets, $450 million to $550 million in revenue with 18% - 22% adjusted EBITDA, remain achievable. However, the negative impact of the pandemic on construction activity, and on our ability to realize the benefits of our manufacturing improvements and commercial initiatives, has delayed our ability to achieve these targets. We expect to re-evaluate the timeline required to achieve the targets once the pandemic nears resolution. We continue to strongly believe that DIRTT’s value proposition will be as or even more relevant in the post-pandemic world.”
Third Quarter Financial Review
Revenue for the quarter ended September 30, 2021 was $34.1 million, a decline of $12.1 million or 26% from $46.2 million for the quarter ended September 30, 2020. The combination of a resurgence in COVID-19 infection rates in late August and September 2021 due to the Delta variant and upstream supply chain issues resulted in a slowdown of construction schedules and delays of projects scheduled to ship in the third quarter of 2021 to the fourth quarter of 2021 and into 2022.
Gross profit for the quarter ended September 30, 2021 was $2.5 million or 7.2% of revenue, a decline of $13.7 million or 85% from $16.2 million or 35.1% of revenue for the quarter ended September 30, 2020. The decrease was largely due to the impact of our fixed costs on lower quarterly revenues, which includes $0.8 million of incremental costs related to our new highly automated panel manufacturing facility in Rock Hill, South Carolina. Additionally, the reduction in gross profit was attributable to the impact of realized increases in the cost of materials, transportation, and packaging over the prior year which reduced gross profit margin by approximately 10%, as well as the $0.5 million negative impact of a stronger Canadian dollar on Canadian based manufacturing costs. The three months ended September 30, 2020 included a $0.5 million reversal of a timber provision that did not reoccur in 2021. In the third quarter of 2021, we reduced our manufacturing workforce by a further 5%.
Adjusted Gross Profit (see “Non-GAAP Financial Measures”) for the quarter ended September 30, 2021 was $4.8 million or 14.0% of revenue, a decline of $13.4 million or 74% from $18.2 million or 39.3% of revenue for the quarter ended September 30, 2020 for the reasons described above.
Sales and marketing expenses increased by $0.6 million to $7.5 million for the quarter ended September 30, 2021, from $6.9 million for the quarter ended September 30, 2020. The increase was largely related to increased salary and wage expenses as we continue to build our sales organization, increased travel, meals and entertainment expenses, $0.3 million due to staff transferred from Technology and Development to Sales and Marketing and higher depreciation expense as we completed our Chicago DXC in 2020, offset by lower commission expense. As economies re-open, we anticipate travel, meals and entertainment expenses will increase over current levels, the timing and amount of such expenses, however, are indeterminate at this time.