Belfast · Building & conversions

Builders in Belfast

Phone numbers for builders covering Belfast — extensions, loft conversions and refurbishment. Open a profile and call the business yourself. This site does not send your job.

Extensions and loft work need more than a day rate. The renovation budget tool can sit beside a local quote. Lisburn, Holywood and Newtownabbey show up on Belfast cards. This is not an England-and-Wales rule set: no Part P notice, and no Boiler Upgrade Scheme. Profiles show a name, the area they cover and a phone number. Public qualifications such as Gas Safe or NICEIC appear only when they are on the profile. Read the cost notes for a sourced national range; a figure on a card is not a quote.

Businesses on this list

3 businesses on this list.

Typical building & conversions costs

Checkatrade’s house-extension guide, per-square-metre table last updated March 2025, is a national sense-check for shell versus finished work. It is not a local tariff. Return extensions are how these terraces grow. Ask if the price keeps the yard gully and the neighbour's light, and do not apply an English planning assumption without checking the local office.

A local rule to check in Belfast

Many extensions, loft conversions and structural openings need building control, and some need planning. A listing is not an approval and not a party-wall agreement.

Questions before you phone

How do I find builders in Belfast on this list?

Red-brick terraces off the Lisburn Road and the streets around Ormeau are the usual stock, with a rear return and a yard. Many houses still have an oil or a different heating history from an English combi street. Names, service areas and phone numbers sit on the cards. Open a profile and call the firm yourself. Lisburn, Holywood and Newtownabbey show up on Belfast cards. This is not an England-and-Wales rule set: no Part P notice, and no Boiler Upgrade Scheme.

Does this page send my job to a Belfast building & conversions firm?

No. You place the call. This site does not email or text anyone on your behalf.

What should the written price say for building & conversions in Belfast?

Yard gully and the neighbour's window on the return should be on the sketch.

What is easy to miss before booking in Belfast?

A firm that writes 'Gas Safe registered' still has to mean the Northern Ireland register, not a Great Britain wording copied from an English template.

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Builders in Brighton

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Electricians in Belfast

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Gardeners in Belfast

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