A hotel building boom is underway Annapolis, where developers are planning to more than quadruple the number of rooms available by 1984.

Four different developers are planning to build five hotels in the town known for its tourism, crabs and as the home of the Maryland state legislature.

They are pushing to add 903 rooms to Annapolis, which at present has only 180 hotel rooms--136 in the Statler Inn on the City Dock, and 44 in the Maryland Inn, in the heart of the historic district.

The largest project calls for 286 rooms on eight stories on the site of Spiro's Restaurant, at Sixth Street and Severn Avenue in Eastport. The site is a block east of the Spa Creek Bridge connecting Eastport and downtown Annapolis.

Also in the works are:

* A 280-room, 10-story Loews hotel at 126 West St., several blocks east of center downtown.

* A 250-room luxury hotel, also 10 stories--and three office buildings--overlooking College Creek. Development is by Coakley and Williams Contractors of Greenbelt.

* Two inns, one with 55 rooms in the Governor Calvert House at 58 State Circle; the other with 31 rooms in the Morrow House in adjacent structures on School Street and State Circle.

Those two inns, totaling 86 rooms, are being developed by Paul Pearson, the proprietor of the Maryland Inn on Church Circle. He will increase by one hotel room the historic Inn where popular guitarist Charlie Byrd is a frequent performer, bringing its total to 45.

In addition, developer Donald H. Gobeli of Baltimore has scheduled ground-breaking this spring on Revell Highway (Route 50) for a 74-unit Econo Lodge on property adjacent to Whitehall Inn--less than a mile west of the Chesapeake Bay Bridge. This comes under Anne Arundel County jurisdiction.

The city of Annapolis and outlying Anne Arundel offer visitors a total of 758 rooms. Completion of the five hotels planned in Annapolis and the Econo Lodge in Whitehall would boost the total to 1,735 rooms.

Preliminary work is already underway at the Governor Calvert House, a pre-Revolutionary War building that will include restaurant and parking facilities.

For the most part, hotel construction is in the blueprint and planning stage, with meeetings scheduled or, as in the case of Pearson's properties, already held with the Annapolis city planning and zoning commission.

The Spiro's project, in which George Lewnes and his sons, Spiro and Charles, are allied with developer Jerome J. Parks, will have eight conference rooms, in addition to the 286 sleeping rooms. The hotel will have "a classic European facade," Parks said.

"We have no concern with regard to financing," Parks said, acting as spokesman for the Lewnes family, which has been in Annapolis for four generations. "People are calling us. . . . We have no problem with that." He estimated the cost of the hotel at $25 million to 30 million.

Parks said hotel guests "can walk right across the Spa Creek Bridge and be just a few blocks from the State House, the historic district, or the Naval Academy."

Richard Neville of the Dunn Development Co., which is in a joint venture with Codine and Stunda of Baltimore, said his group has signed a management agreement with Loews Hotels for the project on West Street. They have completed a traffic and parking impact study and found that "hotels have the least amount of impact on traffic" among possible commercial developments.

"That's in our favor," said Neville, who admitted there already is a traffic problem downtown.

Officials of the joint venture hope to have its proposal placed on the planning and zoning commission's agenda sometime next month, and to seek conditional use approval, which has been given for the Governor Calvert and Morrow houses.

"It all depends on city approval and financing," Neville said of his company's venture. "We're in the market actively . . . a very tough market."

The Coakley and Williams construction plan calls for a 10-story hotel, approximately 90 feet high, near the Adams Park Elementary School. The 17-acre site is the largest of those for which hotels are targeted.

"We're dealing with three entities--the state, the board of education and some private citizens," said Fred Williams of Coakley and Williams. The board is being asked to release four acres it holds as surplus for sale to the builders.

The Greenbelt contractors also are attempting to gain right-of-way across state property in front of the Court of Appeals building to gain access to the proposed site.

The College Creek hotel would have banquet facilities for 500, conference rooms, a 210-seat restaurant, and a cocktail lounge on the top floor seating 230.

"We have presented our site plan to the state and everybody involved," said Williams. "If everything goes in our favor, I'd hope to start building in about six months. It would take another 16 months, then we'd be able to open in the spring of 1984."