Horsham at a glance
- Postcode districts
- RH12
- Population
- about 51,472 (GeoNames)
- Council area
- Horsham District Council
- Building approval
- Horsham District Council building control, or a registered building control approver
- Nearest main town
- Crawley, about 7 miles
- Guide price region
- South East (+10% on West Midlands rates)
What do block and HMO roofs in Horsham need?
When a roof over heated flats in Horsham is replaced, insulation rules usually apply. We design the warm-roof build-up towards the required standard where that is feasible and handle building control where it is needed, so the work is signed off properly and the top-floor flats are better insulated.
Around Horsham, flat roofs are common on bungalows with flat-roofed side extensions and dormers and on lock-up garage blocks on estates. Much of the South East sits in the drier Thames catchment at roughly 730 mm of rain a year, so the usual failures are at joints, upstands and outlets rather than from sheer volume of rain.
How much does a block or HMO roof cost in Horsham?
At South East guide rates, a 150 m² block-of-flats roof in felt with insulation and scaffold comes to £17,100–£29,900 including VAT. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Block of flats (150 m²), felt + insulation + scaffold | £17,100–£29,900 |
| Commercial roof (100 m²), single-ply + insulation | £14,550–£23,950 |
Which roofing systems last longest on a block of flats?
Mastic asphalt, EPDM, single-ply and high-performance built-up felt all give long service lives on block roofs; the right choice depends on the deck, how the roof is used, the details and the whole-life cost.
- Mastic asphalt: 30–60 years with maintenance, common on concrete-decked blocks and walkways. See mastic asphalt roofing.
- EPDM: 25–50 years, laid in large sheets with few joins.
- Single-ply: 25–35+ years, quick to lay on larger roofs, with welded laps. See single-ply roofing.
- Built-up felt: 15–25 years for modern torch-on systems and longer for high-performance systems, robust where maintenance teams walk the roof.
- Liquid-applied: 10–25+ years by product, useful as an overlay on a sound roof with complex details.
The cheapest roof today is not always the cheapest over the life of the building. A longer-life system, with tapered insulation to cure ponding, can mean fewer reactive repairs and fewer rounds of consultation. These lives are indicative and assume good specification and regular maintenance.
What's included?
- Quotes laid out to support leaseholder consultation
- Long-life systems: mastic asphalt, EPDM, single-ply and built-up felt
- Free survey and fixed, itemised written quote
- Building control and insulation upgrades handled where needed
Building regulations in England
Replacing more than half of a flat roof over a heated room usually counts as renovating a thermal element, so the roof is insulated to around 0.16 W/m²K where that's technically and economically feasible, and the work is notified to building control: the council or a registered building control approver, unless a registered competent person self-certifies it. A roof on a new extension is built to 0.15 W/m²K. Patch repairs, and most unheated detached garages, don't trigger the upgrade. Structural changes, or a new covering that adds 15% or more to the roof's weight, also need approval. More on the rules.
Which nearby areas do we also cover?
- Crawley · 7 mi
- Horley · 11 mi
- Haywards Heath · 11 mi
- Burgess Hill · 11 mi
- Dorking · 12 mi
- Reigate · 13 mi
Flats, HMOs and block roofs in Horsham: questions
Do you cover Horsham?
Yes. Horsham is part of our West Sussex coverage, including postcode districts RH12. Surveys and roofs are carried out by vetted roofing teams working under S&K Property Investments and Improvement Ltd.
Who checks building regulations for a flat roof in Horsham?
Where the work needs approval it goes to Horsham District Council building control, or a registered building control approver. We tell you at the survey whether your job needs it and deal with the paperwork as part of the quote.
How much does a block or HMO roof cost in Horsham?
£17,100–£29,900 for a 150 m² block-of-flats roof in felt with insulation and scaffold, at South East guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
What if a top-floor flat is leaking before the roof is replaced?
We can attend for emergency temporary weatherproofing as soon as a team is available, guide £200–£500. That protects the flat while the permanent work is agreed.
Do you run the Section 20 consultation?
No. The freeholder or managing agent runs the consultation; we provide itemised written quotes that can be shared with leaseholders and answer technical questions passed on through the agent.