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★ 4.9/5 · GRP & EPDM Specialists · 25-Year Systems

Flat RoofingTotton

Flat-roofed rear extensions and garages are a standard feature across Totton's 1960s and 1970s estate housing. After 50 to 60 years, the original felt on these structures has long exceeded its service life. We install GRP and EPDM systems that last 25 years or more across all of SO40.

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Flat Roofing Totton

Flat Roofing in Totton

Totton's 1960s and 1970s housing stock — particularly across Calmore and the Testwood area — was built with a high proportion of flat-roofed rear extensions and outbuildings. The felt systems on these structures are now 50 to 60 years old. Annual patching has been the approach for many of these properties for a decade or more. GRP or EPDM replacement eliminates that ongoing cost in a single installation.

Test Valley Humidity and Flat Roofs

Totton's location in the Test Valley creates higher ground moisture and humidity than surrounding upland areas. This accelerates felt deterioration on flat roofs, particularly on north-facing extensions with limited solar drying. GRP and EPDM are both fully resistant to the damp conditions Totton experiences year-round.

Flat Roofing Costs in Totton

Small extension or garage (under 20m²): £900–£1,800 · Medium (15–30m²): £1,800–£3,500 · Large (30m²+): £3,500–£5,500. All quoted free.

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Call us for a free, no-obligation quote anywhere in Totton and the surrounding area.

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More in Totton

All Roofing Services → Roof Repairs Totton → Roof Replacement Totton → Flat Roofing Totton → Emergency Roofer Totton → Guttering Totton → Chimney Repairs Totton →
Customer Reviews

What Local Homeowners Say

★★★★★

"Rear extension felt roof had been leaking every winter for years. GRP system fitted in a day. Completely watertight — not a drop since."

Diane A. · Calmore, Totton
★★★★★

"Garage flat roof was blistering and cracked across most of the surface. EPDM replacement, one day. Excellent finish."

Tony R. · Testwood, Totton
★★★★★

"They found a rotten deck board during survey. Replaced it and installed GRP. Full job done in one day, no hidden extras."

Frances W. · Marchwood, Totton

Flat Roofing Conditions in Totton

The flat-roofed extensions and garages in Totton span a range of ages and conditions. In Test Valley river humidity — one of the dampest locations in Hampshire, felt systems deteriorate faster than in drier inland areas — moisture cycling accelerates blistering and membrane cracking. Most felt flat roofs in Totton that have not been replaced in the last 15 years are now past the point where patching is economical. GRP or EPDM replacement eliminates ongoing maintenance costs in a single installation.

GRP vs EPDM for Totton Properties

GRP fibreglass is our primary recommendation for most Totton residential flat roofs under 30 square metres — seamless, no maintenance, manufacturer-backed guarantee for 25-plus years. For larger flat roof areas over 30 square metres, EPDM single-ply rubber membrane is our preferred system — it handles thermal movement across large areas better than GRP and costs slightly less. Both systems perform equally well in Test Valley river humidity — one of the dampest locations in Hampshire.

Deck Inspection in Totton

On most Totton flat roofs we survey, the deck boards show some deterioration — particularly at perimeter edges and any areas where water has repeatedly ponded. We inspect the deck during every survey and include all necessary board replacement in the quote before work begins. Discovering rotten deck boards after installation has started is the most common source of unexpected costs on flat roof jobs — our pre-start survey eliminates that uncertainty.

Flat Roofing Conditions in Totton

The flat-roofed extensions and garages in Totton span a range of ages and conditions. In Test Valley river humidity — one of the dampest locations in Hampshire, felt systems deteriorate faster than in drier inland areas — moisture cycling accelerates blistering and membrane cracking. Most felt flat roofs in Totton that have not been replaced in the last 15 years are now past the point where patching is economical. GRP or EPDM replacement eliminates ongoing maintenance costs in a single installation.

GRP vs EPDM for Totton Properties

GRP fibreglass is our primary recommendation for most Totton residential flat roofs under 30 square metres — seamless, no maintenance, manufacturer-backed guarantee for 25-plus years. For larger flat roof areas over 30 square metres, EPDM single-ply rubber membrane is our preferred system — it handles thermal movement across large areas better than GRP and costs slightly less. Both systems perform equally well in Test Valley river humidity — one of the dampest locations in Hampshire.

Deck Inspection in Totton

On most Totton flat roofs we survey, the deck boards show some deterioration — particularly at perimeter edges and any areas where water has repeatedly ponded. We inspect the deck during every survey and include all necessary board replacement in the quote before work begins. Discovering rotten deck boards after installation has started is the most common source of unexpected costs on flat roof jobs — our pre-start survey eliminates that uncertainty.

Flat Roofing Conditions in Totton

The flat-roofed extensions and garages in Totton span a range of ages and conditions. In Test Valley river humidity — one of the dampest locations in Hampshire, felt systems deteriorate faster than in drier inland areas — moisture cycling accelerates blistering and membrane cracking. Most felt flat roofs in Totton that have not been replaced in the last 15 years are now past the point where patching is economical. GRP or EPDM replacement eliminates ongoing maintenance costs in a single installation.

GRP vs EPDM for Totton Properties

GRP fibreglass is our primary recommendation for most Totton residential flat roofs under 30 square metres — seamless, no maintenance, manufacturer-backed guarantee for 25-plus years. For larger flat roof areas over 30 square metres, EPDM single-ply rubber membrane is our preferred system — it handles thermal movement across large areas better than GRP and costs slightly less. Both systems perform equally well in Test Valley river humidity — one of the dampest locations in Hampshire.

Deck Inspection in Totton

On most Totton flat roofs we survey, the deck boards show some deterioration — particularly at perimeter edges and any areas where water has repeatedly ponded. We inspect the deck during every survey and include all necessary board replacement in the quote before work begins. Discovering rotten deck boards after installation has started is the most common source of unexpected costs on flat roof jobs — our pre-start survey eliminates that uncertainty.

Honest advice

How to Tell You Need Flat Roofing in Totton

Flat roofs on Totton extensions have a finite life, and the signs of the end are consistent. Here is what to look for before water gets in.

When it is not the answer: If the covering is sound and only a seam or upstand has failed, a targeted repair beats a full re-cover — we will tell you honestly which you need Read the full guide.

Warm deck versus cold deck flat roof build-ups compared layer by layer
Warm-deck construction puts insulation above the deck, removing the condensation risk that plagues cold-deck extensions.
The process

What to Expect: Flat Roofing in Totton

We survey, free of charge

We come out, go up on the roof and into the loft, and trace the fault to its real cause on your Totton property before quoting a penny.

You get it in writing

Your quote is itemised and plain — access and scaffold priced as separate lines — so you can see exactly what you are paying for. No obligation.

We book you in

We agree a time that suits you, and we attend the same day for genuine Totton emergencies.

We do the work

We take up the tired covering, sort the deck and the fall, then lay a new GRP or EPDM system with the upstands and trims detailed correctly. In Totton this most often affects 1960s and 1970s housing stock.

We clear up and sign off

Everything is cleared away, we walk you through the finished job, and you get the written guarantee.

Timescales

Job Durations at a Glance

JobTypical duration
Small garage or porch roof — GRPHalf to 1 day
Single-storey extension — GRP or EPDM1–2 days
Large extension + new insulation2–3 days
Flat roof + integrated skylight2–3 days

Timings on Totton roofs flex with the forecast — we plan around it and never leave a roof exposed overnight.

Access

Getting Safely onto Totton Roofs

Most single-storey flat roofs are reached from towers or a modest scaffold; larger or higher roofs are quoted with full scaffold, always itemised. Scaffold is specified for: first-floor and higher flat roofs, and any roof where edge protection is needed for safe working - always itemised in your written quote, never a hidden extra, and we arrange it.

Totton and Calmore have large post-war estates where scaffold access is straightforward but permits run through New Forest District Council. Pavement scaffold and skip permits go through New Forest District Council; allow a few working days on streets like Commercial Road, Rumbridge Street, the older streets near the Test where space is tight.

Pricing

Flat Roofing Prices in Totton

JobTypical rangeNotes
Garage / porch roof — GRP£800–£1,600Small area
Single-storey extension — EPDM£1,500–£3,000Typical rear extension
Single-storey extension — GRP£1,800–£3,500Typical rear extension
Large extension + insulation£3,500–£6,000Warm-deck build-up
Flat roof + integrated skylight£2,500–£5,000Incl. rooflight

What moves the price

Worked example: an EPDM re-cover on a rear extension on a 1960s semi at a post-war semi in Calmore in Totton: around £2,100 including access.

No large deposit; a materials stage then balance on completion. Written itemised quote with the system warranty stated. VAT included where applicable.

Covering SO40 and surrounding postcodes.

Guarantee

The Guarantee in Plain Terms

The new flat roof carries a 10-year workmanship guarantee; GRP and EPDM systems carry manufacturer material warranties of 20 years or more on top.

The workmanship is guaranteed for 10 years in writing across Totton, with manufacturer material warranties on top of that. Every Totton job — 1960s and 1970s housing stock included — carries the same written guarantee.

“BS 6229, the code of practice for flat roofs, requires that surface water drains freely with no ponding after prolonged dry weather — the single most important factor in flat-roof longevity.”— British Standard BS 6229
Good to know

Disruption, Mess & Weather

Flat-roof work is quieter than a re-roof — some stripping noise and old-felt waste in a skip — and rarely disrupts the rooms below. You do not need to stay home for external work - we just need power and access agreed in advance.

EPDM lays year-round; GRP needs a dry, mild window to cure, which we schedule around Southampton’s weather. Totton sits on the Test estuary edge, so waterfront properties see damp, salt-laden air and quick moss regrowth.

FAQ

Frequently Asked Questions

GRP for most extensions and garages under 30m². EPDM for larger areas. Both perform well in Totton's damp Test Valley conditions. Free inspection and recommendation on all properties.

Most jobs in Totton are completed in one day. Larger extensions may take two days. All deck boards inspected and any rotten sections included in the quote.

If it is under 12 years old and the problem is localised, yes. If it is 15-plus years old with widespread deterioration, replacement is more cost-effective. We inspect and advise honestly.

Yes. Flat roofing work across all of SO40 including Totton, Calmore, Testwood, Marchwood and Nursling.

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Last updated: August 2026

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