A loft conversion changes the roof from a cold roof to a warm roof, requiring breathable membrane, a vapour control layer, and updated insulation to meet Building Regulations Part L. The existing roof covering must be assessed first — a conversion beneath a failing roof creates water ingress into the newly insulated structure.
A loft conversion is one of the most cost-effective ways to add floor space to a Kent property without extending the footprint. But the roofing element — structural changes, waterproofing, insulation and window installation — is the most technically demanding part of the project and the area where corners are most frequently cut by builders who treat roofing as a secondary trade.
Most loft conversions require structural changes to the roof: adding steel beams to carry the floor loads, installing purlins and ridge beam modifications, and cutting into the existing rafter structure to create the head height and dormer openings. All structural changes must be covered by structural engineer calculations and building regulations approval. The structural work is typically carried out by the main builder; the roofing contractor's role begins at the waterproofing stage.
The choice between roof windows (Velux-type) and dormer additions is primarily a planning and structural question, not a waterproofing one. Roof windows are lower-cost, simpler to waterproof and generally permitted development on rear and side slopes. Dormers add more usable floor area at a higher structural and planning cost. We install the roof window or dormer roof covering as part of the conversion, and the waterproofing of these elements is the roofing contractor's primary responsibility.
Loft conversion roofing across Ashford and Kent. Free consultation.
Book Free ConsultationAny new opening in the existing roof covering — for a roof window, a dormer flat roof or a new hip section — must be correctly waterproofed at the junction with the original tile or slate covering. This is the most frequently inadequate element of loft conversions carried out by general builders. A Velux window installed with the wrong flashing kit for the tile profile, or with insufficient overlap at the junction, leaks within the first winter.
We specify the correct flashing kit for the existing tile type at every loft conversion window installation. This is not a judgment call — Velux and equivalent manufacturers produce specific kits for every tile profile, and using the wrong kit invalidates both the window warranty and the flashing performance.
Loft conversion insulation design affects the roof structure's long-term condition. Cold roof construction (insulation at ceiling level, ventilated cold void above) requires adequate cross-ventilation in the cold void to prevent condensation. Warm roof construction (insulation between and above rafters) eliminates the cold void but requires continuous vapour control layer. The choice and detailing affects the risk of condensation in the roof structure over the conversion's lifetime.
We advise on insulation design as part of our loft conversion roofing scope. Getting the vapour and ventilation design right at the build stage prevents the hidden condensation damage that manifests as black mould in ceiling junctions 5–10 years after completion.
Loft conversions within the existing roof envelope using roof windows on rear slopes are generally permitted development. Dormers on rear slopes within volume limits are also typically permitted development. Front dormers, changes to the ridge height and conversions in conservation areas require planning consent. We advise on the planning position at the consultation stage.
Building Regulations Approved Document L sets minimum U-values for roof insulation, which for a warm-roof loft conversion effectively determines the insulation depth and specification.
Source: Approved Document L, Building Regulations
The roofing contractor on a loft conversion should be able to specify the correct flashing kit for the existing tile, advise on appropriate condensation control design, provide structural knowledge of the existing roof before any cutting commences, and provide a written guarantee on all waterproofing details. Do not accept a builder who subcontracts the roofing to an unknown third party without providing their own warranty on the waterproofing work.
Loft conversion roofing across Ashford, Folkestone, Canterbury and Kent. Call to discuss.
Call 01233 877 146Every loft conversion roofing guide job starts with a free inspection and written quote before any work begins. We do not start work until you have confirmed the written quote. Our standard rates apply across Ashford and the surrounding Kent area.
We cover all Ashford postcodes and the surrounding towns: Folkestone, Canterbury, Maidstone, Tenterden, Hythe and the villages across the Weald. Emergency cover is available 24 hours a day on 01233 877 146.
No call-out fee across our full service area. Written quote before work starts. For loft conversion roofing guide work the quote is provided on the same visit as the inspection in most cases. You pay only for work carried out.
All re-roofing work and major repairs carry our written 10-year workmanship guarantee. Lead flashing work is guaranteed for 10 years. Minor tile repairs carry a 2-year guarantee. The guarantee is provided in writing at completion and transfers to a new owner if the property is sold.
We are registered with the National Federation of Roofing Contractors. Verify our registration at nfrc.co.uk. We carry 5m public liability insurance on every loft conversion roofing guide job. Insurance certificate available on request before work starts.
Ashford's housing stock spans five decades of construction: Victorian and Edwardian terraces in Newtown and the older town streets, 1930s semis in Kennington and Willesborough, post-war and 1960s estates at Bockhanger, Stanhope and Park Farm, and more recent development across the southern suburbs.
Each era presents different characteristics. Victorian clay tile on period properties requires matching reclaimed material and lime mortar at any repointing work. 1960s concrete interlocking tile on the estates is now 50-65 years old with corroded nail fixings on most unmodified properties. Understanding which housing era a property belongs to is the starting point for any assessment.
These estates are Ashford's highest-volume source of roofing work. The 1960s-70s concrete interlocking tile stock is now 50-65 years old. Nail sickness is present on the majority of unmodified properties. If you live in one of these areas and have not had roofing work in the last 15 years, a free assessment is worthwhile.
The Victorian terraces in Ashford's Newtown area and the older streets around the town centre require period-appropriate specification: reclaimed or reproduction clay tile, lime mortar at chimney repointing, and conservation-aware approach to any work on visible elevations.
Free survey and advice across Ashford and Kent. Call 01233 877 146.
Call 01233 877 146For context on how roofing costs compare across the range of work we carry out, here are realistic price ranges for the most common jobs across the Ashford area. All prices include labour and materials. VAT is not applicable on most domestic residential roofing work.
| Job Type | Typical Cost |
|---|---|
| Single tile replacement | £150 – £300 |
| Ridge repointing (per 4m) | £200 – £400 |
| Lead chimney flashing replacement | £500 – £1,100 |
| Full re-roof (3-bed semi, concrete tile) | £4,800 – £7,500 |
| Flat roof replacement (GRP, up to 20m2) | £900 – £1,800 |
| Full gutter clear (semi-detached) | £80 – £160 |
| Fascia and soffit replacement (semi) | £800 – £1,800 |
| Roof condition survey | £120 – £200 |
Free written quotes on all work. No call-out fee. Call 01233 877 146 to book.
We are a family-run roofing business based in Ashford, covering the town and the surrounding Kent area. We have been working on roofs in this area since 2003. Every job is carried out by our own employed team — we do not subcontract labour. The people who quote are the people who work.
We are registered with the National Federation of Roofing Contractors (NFRC). Our registration can be verified at nfrc.co.uk. We carry £5m public liability insurance on every job. Our insurance certificate is available on request before any work starts. All re-roofing work carries a written 10-year workmanship guarantee. Lead flashing work is guaranteed for 10 years. The guarantee is transferable to a new owner if the property is sold.
We cover Ashford and a broad area of the surrounding Kent countryside: Folkestone, Hythe, Canterbury, Maidstone, Tenterden, and the villages across the Weald and Romney Marsh. Emergency cover is available 24 hours a day, 7 days a week. Call 01233 877 146 for any roofing emergency. For non-urgent work, we aim to survey within 5-7 working days and have the quote in writing within 48 hours of the survey.
We do not charge for call-outs or surveys. Every job gets a written quote before a single tile is moved. The quoted price is the price on the invoice unless we identify and agree additional scope with you during the work. For re-roofing projects where deck condition is unknown before stripping, we include a clear provisional allowance for batten replacement rather than presenting you with a surprise on invoice.
These are the questions we are asked most frequently when homeowners call us for the first time. If your question is not here, call 01233 877 146 and we will answer it directly.
Yes. All call-outs and surveys are free of charge across Ashford and the surrounding Kent area. The written quote we provide after the survey is also free and carries no obligation. We do not charge for surveys even on properties where we ultimately recommend no immediate work.
For emergency calls where water is actively entering the building: same day where call volume permits. For the most urgent calls — active ingress, safety hazard from displaced tiles — we aim to attend within 2 hours. Out-of-hours emergency cover is available 24/7 on 01233 877 146. For non-urgent work we survey within 5-7 working days.
Written workmanship guarantee on all work. 10 years for full re-roofing and lead flashing work. 5 years for ridge repointing. 2 years for minor tile repairs. The guarantee is provided in writing at completion. It transfers to a new owner if the property is sold. We are NFRC registered and carry £5m public liability insurance.
For most standard concrete interlocking profiles we carry matching tiles on the van. For conservation area repairs requiring reclaimed clay tile or matched Welsh slate, we source from Kent and Sussex demolition salvage and confirm match quality before committing. We show samples on any repair where visual matching is important before starting work.
We cover Ashford and all of the surrounding Kent area: Folkestone, Hythe, Canterbury, Maidstone, Tenterden, and the villages across the Weald. If you are outside Ashford town, call us and we will confirm whether we cover your postcode. Most Kent postcodes within 25 miles of Ashford are in our standard service area.
Last reviewed: July 2026
Not always, but the existing covering must be assessed first. A conversion beneath a failing roof creates water ingress into the newly insulated structure, so re-roofing is included where the covering is at end of life.
A cold roof has insulation at ceiling level with a ventilated void above. A warm roof, used in loft conversions, has insulation between and above the rafters making the occupied space warm.
Yes. Loft conversions are notifiable and must meet Approved Documents A (structure), B (fire), C (moisture), F (ventilation), L (insulation) and K (staircase and glazing safety).
Yes. Roof window installation is typically the most straightforward element, carried out as part of the structural framing and external roofing work.