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 $482, a growth of 52%.
Most valuable 2018 LEGO Classic set
10405 Mission to Mars $105.48
Highest growth 2018 Classic set
10712 Bricks and Gears +125.11%
Largest 2018 LEGO Classic set
10717 Extra Large Brick Box 1,500 pieces
Most owned 2018 Classic set
10714 Blue Baseplate
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 $8.07
Growth  +61.7%
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 $13.18
Growth  +31.9%
Annual growth 2.3%

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 $23.44
Growth  +17.3%
Annual growth 2.6%

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 $35.00
Growth  +16.7%
Annual growth 2.0%

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 $105.48
Growth  +75.8%
Annual growth 4.5%

10712 Bricks and Gears

Theme Classic
Year 2018
Pieces 244
Availability Retired
10712 LEGO Bricks and Gears
Retail $19.99
Value $45.00
Growth  +125.1%
Annual growth 7.2%

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 $15.23
Growth  +90.6%
Annual growth 6.8%

10715 Bricks on a Roll

Theme Classic
Year 2018
Pieces 442
Availability Retired
10715 LEGO Bricks on a Roll
Retail $24.99
Value $36.87
Growth  +47.5%
Annual growth 2.4%

10717 Extra Large Brick Box

Theme Classic
Year 2018
Pieces 1,500
Availability Retired
10717 LEGO Extra Large Brick Box
Retail $59.99
Value $79.38
Growth  +32.3%
Annual growth 5.2%

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 $42.67
Growth  +113.5%
Annual growth 5.6%

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 $29.16
Growth  +45.9%
Annual growth 6.2%

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 $28.86
Growth  +44.4%
Annual growth 5.6%