Loft and cavity wall insulation · Northern Ireland

Loft and cavity wall insulation in Belfast

Loft top-ups and cavity fill are the cheapest fabric measures for most homes in Belfast, provided the survey comes first.

Social landlords in Belfast can appoint us for loft and cavity wall insulation, from a single home to a programme. Social homes in Belfast are owned by the Northern Ireland Housing Executive and housing associations. We work to the Northern Ireland Decent Homes Standard and to your own specification.

Belfast at a glance

Council: Belfast City Council
Nation: Northern Ireland
Council homes: Housing Executive and housing associations
Housing standard: Decent Homes Standard (NI)
Damp and mould timescales: No timescale law found
Population: 342,560 (2020 estimate)
Regional price factor: 0.90 (our estimate)

In Northern Ireland the Housing Executive, not the council, is the public landlord. Population: ONS 2020 mid-year estimate.

Who owns the social homes in Belfast?

In Northern Ireland, councils are not housing authorities. Social homes in Belfast are owned by the Northern Ireland Housing Executive and by registered housing associations, which are regulated by the Department for Communities.

What do we cover in Belfast?

Cavity wall insulation injection
Extraction of failed or unsuitable cavity fill
Loft insulation top-ups to current recommended depths
Boarded walkways, hatch insulation and draught-proofing
Loft ventilation checks and remedial vents

Loft and cavity wall insulation in a social home

How do we deliver it?

Loft work includes checking that the eaves are still ventilating once the new insulation is down, because blocked eaves cause condensation in the roof space.

Which rules apply in Belfast?

PAS 2035:2023 sets the whole-house retrofit process (assessment, coordination, design, installation and evaluation), and PAS 2030:2023 covers installation. Most government-backed retrofit schemes require both, with TrustMark lodgement.

Decent Homes Standard (NI) · More about loft and cavity wall insulation

What does loft and cavity wall insulation cost in Belfast?

Our guide range for cavity wall insulation in Belfast is £850–£2,450 per home. That is the UK range of £950–£2,700 (published figure) adjusted by a regional cost factor of 0.90 (our own estimate); figures are before VAT where the source states it. Every job is priced after survey; specification, access and the condition of the homes will move the figure.

Questions about loft and cavity wall insulation in Belfast

Who is the social landlord in Belfast?

Which housing standard applies in Belfast?

In Northern Ireland, the Housing Executive and registered housing associations work to the Northern Ireland Decent Homes Standard, which the Department for Communities consulted on revising in 2025–26.

Can you take on loft and cavity wall insulation in Belfast as a subcontractor?

Yes. Main contractors working for social landlords in Belfast can engage us as a tier-2 subcontractor for loft and cavity wall insulation, working under their systems and their client's specification.