More than 50,000 persons are expected to attend the 33rd annual convention-exposition of the National Association of Home Builders beginning this weekend in Dallas.

Builders, architects, planners, sub-contractors, lenders and building product manufacturers and others in housing-related fields will participate. Sessions will cover rising land development and construction costs, mortgage financing and housing for moderate-income people.

The convention also features more than 600 exhibits of building materials, products and services. Among the displays are a multi-storage pantry, a strikingly contemporary kitchen, "fancy butt" shingles of western red cedar for indoor and outdoor use and "brick 'n' beam" wall paneling.

Along with other federal officials, eight members of the Senate and House will speak. The convention opens Sunday with an address by Rep. Jim Wright (D-Tex.), new majority leader of the House. Rep. Henry Reurs (D-Wis.) chairman of the House Committee on Banking, Currency and Housing, will address the NAHB board of directors at a meeting Monday.

Delegations from the District, suburban Maryland and Virginia will include several hundred area builders and housing-related professionals, including builder Milton E. Kettler and engineer Arnold Kronstadt, veteran participants in NAHB convention programs.

The sessions wind up Thursday with the installation of new national officers. Robert C. Arquilla of Chicago, first vice president, is unopposed to succeed John C. Hart as president.

Additionally, NAHB members will meet their new executive vice president, David E. Stahl, who held the same post with the Urban LandInstitute here. He succeeds Nathaniel H. Rogg, who is retiring.