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Sets
Basic
Basic Building Set

503 LEGO Basic Building Set

Name: LEGO Basic Building Set
Brand: LEGO
SKU: 503-1
Availability: InStock
Rating: 4.60 (13 reviews)

Images 1

LEGO 503 Basic Building Set is a vintage Basic set from 1987 valued at $16 for new and sealed sets, up 229% from an original retail price of $4.95. Annual appreciation has averaged 2.75% since release. On the used market, values range from $10 to $16 based on condition.

Set Value (New/Sealed)

This chart represents the current new/sealed value of the set Basic Building Set since December 2019. High accuracy

LEGO 503-1 Basic Building Set is a Basic theme set released in 1987, containing 34 pieces. It includes a selection of standard bricks and plates in primary colors along with a trans-clear 2 x 2 slope and a 2 x 2 modified brick with small wheels and tires for simple rolling builds. Designed as an entry-level box in the late-1980s Basic line, it supports free-form construction of small vehicles and structures.

A new and sealed Basic Building Set is currently valued at around $16, with annual growth of approximately 3%, which is lower than other Basic sets. The average used price is $10 for those in good overall condition. New and sealed listings currently range from $15 to $17. Based on current trends, this set could be valued near $17 within the next year.

All regions

All regions 2
United States 2

For Sale (New/Sealed)

	(US) 503	BrickEconomy Choice $15.00
	(US) Yellow Surfer Torso (973 / 88585) inv 503	$16.99 +4.3%

All regions

All regions 2
United States 2

For Sale (Used)

	(US) Used - eBay listing for 503 Basic Building Set	$9.90
	(US) Used - Set 100% complete with instructions. Moderate playwear.	$10.00

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	557 Basic Building Set Theme Basic Year 1987 Pieces / Minifigs 711 / 2 Availability Retired Buy this set at Bricklink	Retail $15.49 Value $354.45 Growth +2188.3% Annual growth 3.9% I own this set I want this set

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	1575-2 Basic Set with Board Game Theme Basic Year 1987 Pieces / Minifigs 230 / 1 Availability Retired Buy this set at Bricklink	Retail $19.99 I own this set I want this set

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	1588 Basic Building Set Theme Basic Year 1987 Pieces 27 Availability Retired Buy this set at eBay	Retail $1.49 Value $9.96 Growth +568.5% Annual growth 3.4% I own this set I want this set

	1609 Ship Theme Basic Year 1987 Pieces 27 Availability Retired Buy this set at Bricklink	Retail $5.99 Value $91.55 Growth +1428.4% Annual growth 7.2% I own this set I want this set

	1607 Helicopter Theme Basic Year 1987 Pieces 25 Availability Retired Buy this set at eBay	Retail $1.69 Value $4.72 Growth +179.3% Annual growth 5.7% I own this set I want this set

	1606 Red and Yellow Car Theme Basic Year 1987 Pieces 23 Availability Retired Buy this set at eBay	Retail $1.69 Value $11.93 Growth +605.9% Annual growth 5.9% I own this set I want this set

	1604 Basic Set Theme Basic Year 1987 Pieces 17 Availability Retired Buy this set at eBay Bricklink	Retail $8.99 Value $9.40 Growth +4.6% I own this set I want this set

My Collection

I own this set

I want this set

Set Details

Set number

503-1

Name

Basic Building Set

Theme

Basic

Year

1987

Availability

Retired

Pieces

34 (PPP $0.15)

Set Pricing

Retail price

$4.95

New/Sealed

Value

$16.29

Growth

+229.09%

Annual growth

+2.75%

90-day change

1.03%

Used

Value

$10.00

Range

$9.80 - $16.24

Quick Buy

eBay

Buy

Lowest price

$15.00

Highest price

$16.99

*Listings are for new/sealed sets.

Set Predictions

New/Sealed

Today's value

$16.29

1 year forecast

$16.74+2.75%

5 year forecast

$18.51+13.62%

$18

$19

503 Basic Building Set is projected to be valued between $18 - $19 within five years.

Insights

Released long ago and now retired, Basic Building Set (503) shows post-retirement appreciation driven by relatively scarce sealed copies, and its vintage Basic status attracts attention, but pervasive part overlap with later Basic assortments and thin trading activity limit its long-term upside.

Set Facts

The set includes multiple blue, red, and yellow basic bricks in sizes 1x2, 2x2, and 2x4, as well as matching plates in blue and red.
It also features a trans-clear Slope 45 2x2, yellow Slope 45 2x2, and a black modified 2x2 brick with red wheels and black tires.

Basic Building Set Reviews

13 ratings

4.6

Collectors

Investors

Theme Analysis

Basic

Sets

402

Years

1972 - 2003

Annual growth

+3.90% (this set +2.75%)

This set's annual growth (CAGR) vs. subtheme

Community Stats

Basic Building Set currently ranks #374 out of the top most owned sets in Basic.

#1Building Plate, Green

#2X-Large Baseplate Grey

#3Brick Separator, Green

#4Universal Building Set

#5Basic Building Set

#374Basic Building Set

#375Basic Building Set

#376Dalmatian Station Building Set

About Basic

The LEGO Basic theme, which began in the 1970s, was designed to be a more general, non-thematic series of sets. Unlike the themed sets that revolve around specific stories, characters, or concepts (e.g., space, city, or pirates), the Basic theme provided a collection of standard LEGO bricks and pieces, often in a variety of colors. The goal was to encourage free building and creativity without the confines of a specific theme or narrative.

Set Pricing Models

BrickEconomy uses a number of methods to determine the value of a set.

New/Sealed

Machine Learning/AI Model

Value (today)

$16.29

Value (in a year)

$16.74

Value (in 2 years)

$17.19

Accuracy

0.920200 High

Statistical Model

Value (today)

$15.12

Value (in a year)

$15.51

Value (in two years)

$15.91

Accuracy

0.433756 Low

Used

Machine Learning/AI Model

Value (today)

$10.00

Value (low range)

$9.80

Value (high range)

$16.24

Accuracy

0.865200 High

To learn more about how we calculate pricing and forecasting, check out our article on BrickEconomy’s Approach to LEGO Pricing and Future Value Predictions.

Region · United States (USD)

Theme · Light

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