GRP fibreglass and EPDM rubber flat roofs for extensions and garages. 25-year systems. Covering all PO12 postcodes including Gosport, Lee-on-the-Solent, Alverstoke.
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Flat Roofing Gosport
Flat Roofing in Gosport, Hampshire
Gosport is a peninsula town with the Solent on three sides — its housing has the most severe maritime exposure of any area we cover. Victorian naval housing near the waterfront and dockyard area, 1930s to 1950s semis in Alverstoke and Bridgemary, and large post-war estates at Rowner and Bridgemary built in the 1960s and 1970s. Lee-on-the-Solent has a distinct character with 1920s to 1950s coastal housing.
Our flat roofing service covers all of PO12 — free surveys, honest assessments and no call-out fees. Call 0238 184 9628 for same-week availability across Gosport.
The flat-roofed extensions and garages in Gosport span a wide age range. The oldest — on Victorian and 1930s properties — have felt systems that in some cases date from mid-20th century extensions. The most common stock is 1970s to 1990s felt, now 30 to 50 years old and well beyond its design life. In Gosport's full Solent exposure — the highest salt air concentration in our coverage area, fastest deterioration rates, felt deteriorates faster than in drier inland areas — the moisture cycling accelerates blistering and cracking of the bitumen.
GRP for Gosport Extensions
GRP fibreglass is our primary recommendation for most Gosport residential flat roofs. The seamless installation has no joints for water to find, performs well in Hampshire's persistent wet conditions, and requires zero maintenance for 25-plus years. For standard kitchen and dining extensions across Gosport's estate housing, GRP is the most practical and cost-effective system available.
Deck Inspection in Gosport
On most Gosport flat roofs we survey, the deck boards show at least some deterioration — particularly at the perimeter where the flat roof meets the wall junction, and at any ponding areas where water has repeatedly stood. We inspect the deck during survey and include all necessary board replacement in the quote before work begins. This is the most common source of unexpected costs on flat roof jobs — we eliminate it by checking before we price.
Customer Reviews
What Gosport Homeowners Say
★★★★★
"Rear extension felt roof had been leaking every winter. GRP system installed in one day. Completely different — not a drop since. Should have done it years ago."
Diane R. · Gosport
★★★★★
"They found two rotten deck boards during the survey — included them in the quote and replaced before laying GRP. No extras on the invoice. Honest work."
Andrew K. · Gosport, Hampshire
★★★★★
"Garage flat roof — original 1970s felt, completely saturated. GRP replacement, half a day. Clean finish and the guarantee gives real peace of mind."
Carol T. · Rowner estate area, Gosport
Flat Roofing Conditions in Gosport
The flat-roofed extensions and garages in Gosport span a range of ages and conditions. In full Solent exposure — highest salt air concentration in our coverage area, felt systems deteriorate faster than in drier inland areas — moisture cycling accelerates blistering and membrane cracking. Most felt flat roofs in Gosport 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 Gosport Properties
GRP fibreglass is our primary recommendation for most Gosport 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 full Solent exposure — highest salt air concentration in our coverage area.
Deck Inspection in Gosport
On most Gosport 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 in Gosport — What We Find
The flat-roofed extensions and garages in Gosport span a wide age range. The oldest — on Victorian and 1930s properties — have felt systems that in some cases date from mid-20th century extensions. The most common stock is 1970s to 1990s felt, now 30 to 50 years old and well beyond its design life. In Gosport's full Solent exposure — the highest salt air concentration in our coverage area, fastest deterioration rates, felt deteriorates faster than in drier inland areas — the moisture cycling accelerates blistering and cracking of the bitumen.
GRP for Gosport Extensions
GRP fibreglass is our primary recommendation for most Gosport residential flat roofs. The seamless installation has no joints for water to find, performs well in Hampshire's persistent wet conditions, and requires zero maintenance for 25-plus years. For standard kitchen and dining extensions across Gosport's estate housing, GRP is the most practical and cost-effective system available.
Deck Inspection in Gosport
On most Gosport flat roofs we survey, the deck boards show at least some deterioration — particularly at the perimeter where the flat roof meets the wall junction, and at any ponding areas where water has repeatedly stood. We inspect the deck during survey and include all necessary board replacement in the quote before work begins. This is the most common source of unexpected costs on flat roof jobs — we eliminate it by checking before we price.
Honest advice
Flat Roofing in Gosport: Do You Need It?
Not every tired flat roof needs replacing, but felt in Gosport’s damp air rarely lasts. Here is how to tell whether yours has reached the end.
A failed upstand where the flat roof meets a wall
Damp or a musty smell in the room directly beneath
Blistering, cracking or splitting in an old felt covering
A persistent leak into the room or garage below
Sagging or soft spots underfoot indicating a failing deck
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 construction puts insulation above the deck, removing the condensation risk that plagues cold-deck extensions.The process
From First Call to Sign-Off in Gosport
Free survey
We inspect the roof and the void from inside the loft, identify the fault and its cause, and check what is developing next on your Gosport property.
Written itemised quote
You get a clear written quote with any access or scaffold costs shown separately — no call-out fee, no obligation, no vague lump sum.
Scheduling
We book a convenient time, with same-day attendance for genuine emergencies across Gosport.
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.
Cleanup & sign-off
We clear all debris, show you the finished work, and hand over the workmanship guarantee.
Timescales
Job Durations at a Glance
Job
Typical duration
Small garage or porch roof — GRP
Half to 1 day
Single-storey extension — GRP or EPDM
1–2 days
Large extension + new insulation
2–3 days
Flat roof + integrated skylight
2–3 days
Timings on Gosport roofs flex with the forecast — we plan around it and never leave a roof exposed overnight.
Access
Getting Safely onto Gosport 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.
Gosport’s dense waterfront terraces have very tight access, so scaffold and skip permits through Gosport Borough Council are the norm. Pavement scaffold and skip permits go through Gosport Borough Council; allow a few working days on streets like Stoke Road, High Street, the terraced streets near the waterfront where space is tight.
Pricing
Flat Roofing Prices in Gosport
Job
Typical range
Notes
Garage / porch roof — GRP
£800–£1,600
Small area
Single-storey extension — EPDM
£1,500–£3,000
Typical rear extension
Single-storey extension — GRP
£1,800–£3,500
Typical rear extension
Large extension + insulation
£3,500–£6,000
Warm-deck build-up
Flat roof + integrated skylight
£2,500–£5,000
Incl. rooflight
What moves the price
Covering system — GRP or EPDM
Roof area and any deck repairs needed
Whether the fall must be corrected
Insulation to meet warm-deck standard
Skylights or access hatches added
Worked example: an EPDM re-cover on a rear extension on a Victorian terrace at a waterfront terrace off Stoke Road in Gosport: 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 PO12, PO13 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.
Covered: workmanship for 10 years, in writing, transferable if you sell.
On top: manufacturer warranties on materials (terms vary by product).
Not covered: storm or impact damage - that is an insurance matter, and we will document it for your claim.
Every Gosport job carries the same written 10-year workmanship guarantee, and any materials carry their manufacturer warranties on top.
“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. Gosport is a low-lying peninsula fully exposed to Solent salt air and wind on almost every side.
FAQ
Frequently Asked Questions
Yes. We cover Gosport and all PO12 postcodes for flat roofing. Free no-obligation quotes on all work. Call 0238 184 9628.
Costs vary by property size and scope. We provide free no-obligation quotes across Gosport — call 0238 184 9628 or request a quote online.
No call-out fee for any roofing work in Gosport or PO12.
Yes. 24/7 emergency call-outs across Gosport. We aim for same-day attendance. No call-out fee.
Small extension or garage under 20m²: £900 to £1,800. Medium extension 15 to 30m²: £1,800 to £3,500. Large flat roof over 30m²: £3,500 to £6,000. All deck inspection included. Free quotes across Gosport and PO12.
Most single-storey extension and garage flat roofs in Gosport are completed in one day. Larger areas or where significant deck board work is needed may take two days. We confirm timing in the quote.
Yes. This is the ideal time — including a skylight in the flat roof replacement programme is more cost-effective than a separate return visit. We quote for skylight integration as a combined job.
Small extension or garage under 20m²: £900 to £1,800. Medium extension 15 to 30m²: £1,800 to £3,500. Large flat roof over 30m²: £3,500 to £6,000. All deck inspection included. Free quotes across Gosport and PO12.
Most single-storey extension and garage flat roofs in Gosport are completed in one day. Larger areas or where significant deck board work is needed may take two days. We confirm timing in the quote.
Yes. This is the ideal time — including a skylight in the flat roof replacement programme is more cost-effective than a separate return visit. We quote for skylight integration as a combined job.
Get In Touch
Free Quote in Gosport
No call-out fee. No obligation. Same-week availability across PO12.
