Tisbury residents resoundingly approved a debt exclusion to fund an overhaul of the Vineyard Haven library at a special election Tuesday.

The 305 to 130 vote clears the way for the town to borrow up to $4.8 million for long-deferred repairs and improvements to the deteriorating library on Main street. 

The Proposition 2 1/2 override was the sole ballot question in the election, held three weeks after a voice vote at a special town meeting overwhelmingly approved the library’s borrowing request.

The actual dollar amount for the library project will be determined after contractors’ bids are submitted next month, according to Arch Smith, who chairs the library’s elected board of trustees.

The borrowing is expected to add about 5 cents per $1,000 in property taxes for year-round Tisbury residents, who pay a lower amount than seasonal property owners.

Owners who do not receive the residential tax exemption would see an annual increase of about $90 on a median-priced property of $1.2 million and about $135 on an average-priced property of $1.8 million. 

Built in 1967 and last renovated in 1999, the town’s library needs a new roof, shingles, windows, insulation, heating and air conditioning systems, bathrooms, paint, ceilings and carpeting, library officials have said previously. 

Stormwater runoff regularly floods the lower floor of the Main street building, and sewer gas can back up in the toilets.

The proposed renovation would also include an addition, which is being largely funded by donations and money the library had from earlier appropriations. The addition would allow the library to expand its reading room and provide a community room for gatherings and events.