In 2018, LEGO released 13 Classic sets across 2 subthemes. Subthemes for that year included 60th Anniversary Limited Edition and Building Bigger Thinking. For that year, the total price of all retail sets cost $318, today those sets are valued around $500, a growth of 57%.
Most valuable 2018 LEGO Classic set
10405 Mission to Mars $106.10
Highest growth 2018 Classic set
10714 Blue Baseplate +119.02%
Largest 2018 LEGO Classic set
10717 Extra Large Brick Box 1,500 pieces
13 sets

10401 Rainbow Fun

Theme / Subtheme Classic / Building Bigger Thinking
Year 2018
Pieces 85
Availability Retired
10401 LEGO Building Bigger Thinking Rainbow Fun
Retail $4.99
Value $8.48
Growth  +69.9%
Annual growth 3.5%

10402 Fun Future

Theme / Subtheme Classic / Building Bigger Thinking
Year 2018
Pieces / Minifigs 186 / 1
Availability Retired
10402 LEGO Building Bigger Thinking Fun Future
Retail $9.99
Value $13.40
Growth  +34.1%
Annual growth 3.9%

10403 World Fun

Theme / Subtheme Classic / Building Bigger Thinking
Year 2018
Pieces / Minifigs 295 / 2
Availability Retired
10403 LEGO Building Bigger Thinking World Fun
Retail $19.99
Value $21.49
Growth  +7.5%
Annual growth 1.8%

10404 Ocean's Bottom

Theme / Subtheme Classic / Building Bigger Thinking
Year 2018
Pieces / Minifigs 579 / 2
Availability Retired
10404 LEGO Building Bigger Thinking Ocean's Bottom
Retail $29.99
Value $35.62
Growth  +18.8%
Annual growth 1.7%

10405 Mission to Mars

Theme / Subtheme Classic / Building Bigger Thinking
Year 2018
Pieces / Minifigs 871 / 3
Availability Retired
10405 LEGO Building Bigger Thinking Mission to Mars
Retail $59.99
Value $106.10
Growth  +76.9%
Annual growth 4.7%

10712 Bricks and Gears

Theme Classic
Year 2018
Pieces 244
Availability Retired
10712 LEGO Bricks and Gears
Retail $19.99
Value $29.97
Growth  +49.9%
Annual growth 4.2%

10713 Creative Suitcase

Theme Classic
Year 2018
Pieces 213
Availability Retail (Retiring soon)
10713 LEGO Creative Suitcase
Retail $19.99
Available at retail
Retiring soon

10714 Blue Baseplate

Theme Classic
Year 2018
Pieces 1
Availability Retired
10714 LEGO Blue Baseplate
Retail $7.99
Value $17.50
Growth  +119.0%
Annual growth 7.5%

10715 Bricks on a Roll

Theme Classic
Year 2018
Pieces 442
Availability Retired
10715 LEGO Bricks on a Roll
Retail $24.99
Value $35.99
Growth  +44.0%
Annual growth 4.4%

10717 Extra Large Brick Box

Theme Classic
Year 2018
Pieces 1,500
Availability Retired
10717 LEGO Extra Large Brick Box
Retail $59.99
Value $99.60
Growth  +66.0%
Annual growth 7.6%

4000028 House

Theme / Subtheme Classic / 60th Anniversary Limited Edition
Year 2018
Pieces 64
Availability Retired
4000028 LEGO 60th Anniversary Limited Edition House
Retail $19.99
Value $43.39
Growth  +117.1%
Annual growth 5.9%

4000029 Windmill

Theme / Subtheme Classic / 60th Anniversary Limited Edition
Year 2018
Pieces 45
Availability Retired
4000029 LEGO 60th Anniversary Limited Edition Windmill
Retail $19.99
Value $32.16
Growth  +60.9%
Annual growth 8.2%

4000030 Truck

Theme / Subtheme Classic / 60th Anniversary Limited Edition
Year 2018
Pieces 44
Availability Retired
4000030 LEGO 60th Anniversary Limited Edition Truck
Retail $19.99
Value $35.86
Growth  +79.4%
Annual growth 7.3%