Fascias, soffits, and barge boards collectively form the roofline of your home — the visible trim along the eaves and gable ends that keeps moisture, birds, and cold air out of the roof void. When they rot or crack, they are not just unsightly: water ingress can lead to damp in the ceiling, timber decay in the roof structure, and pest problems. Replacement is one of the more straightforward roofing jobs, but costs vary considerably depending on material, property size, and access.
What Each Component Does
Fascia boards run horizontally along the eaves at the base of the roof, directly beneath the bottom row of tiles. The guttering attaches to the fascia.
Soffits are the horizontal or sloped panels that close in the gap between the fascia and the wall. They are often vented (with small holes or grilles) to allow air circulation into the roof void, which helps prevent condensation and interstitial damp.
Barge boards (also called verge boards or gable boards) run along the sloped edges of a gable end roof, covering the exposed rafter feet and protecting the roof edge from weather.
Replacement Cost Guide
| Property type | uPVC roofline (inc. VAT) | Timber roofline (inc. VAT) |
|---|---|---|
| 1-bed flat / small terraced | £900–£1,600 | £1,400–£2,500 |
| 2–3 bed mid-terraced | £1,400–£2,200 | £2,000–£3,500 |
| 3-bed semi-detached | £1,800–£3,000 | £2,500–£4,500 |
| 4-bed detached | £2,800–£4,500 | £4,000–£7,000 |
| Large detached / extended | £4,000–£7,000+ | £6,000–£12,000+ |
Costs include removal of the existing roofline, supply and installation of new boards, and guttering rehang or replacement where needed. Scaffolding is usually included in quotes from reputable roofline companies for two-storey work; confirm this before accepting a quote.
uPVC vs Timber: Which Is Better?
uPVC (most common)
uPVC (unplasticised polyvinyl chloride) has largely replaced timber as the standard roofline material in the UK since the 1990s. Advantages:
- Maintenance-free — never needs painting or treating; occasional wash with soapy water is all that is required
- Rot-proof — will not decay even in sustained wet weather
- Long lifespan — reputable uPVC products carry 10–15 year guarantees; realistic lifespan is 30–40 years
- Lower cost — approximately 30–40% cheaper than timber to supply and install
Downsides: uPVC can look plastic and flat in comparison to painted timber, and it cannot be satisfactorily painted a different colour in later years. It may also not be suitable in conservation areas where planning conditions specify timber.
uPVC fascia and soffit boards typically come in 9 mm or 18 mm thickness. The 18 mm board is noticeably stiffer and better suited to longer unsupported spans.
Timber (traditional)
Painted softwood or hardwood roofline boards remain the right choice for period properties and conservation areas. Modern treated softwood (e.g. tanalised redwood) lasts longer than the old untreated boards, but still requires repainting every 5–8 years (£300–£800 for a painter, depending on access and property size). Hardwood barge boards (oak, iroko, or western red cedar) are more durable but cost significantly more to supply.
If timber is specified, ensure the replacement boards are pre-primed on all four faces before installation — painting only the front face after fitting leaves the back face vulnerable to moisture.
Aluminium and composite
Aluminium fascia boards are used on some modern builds and flat-roof extensions. They are durable and maintenance-free but more expensive than uPVC and less widely available. Composite (wood-effect) roofline boards offer the appearance of timber with lower maintenance; costs sit between uPVC and timber.
What Affects the Total Cost
Scaffolding — The single biggest variable. A two-storey semi needs a scaffold that typically adds £500–£1,200 depending on the contractor. Some companies use mobile tower scaffolds or MEWP (cherry pickers) for smaller jobs to reduce cost, but these are not always suitable for all roof profiles.
Gutter replacement — Many roofline jobs coincide with gutter replacement. Adding full half-round or ogee uPVC guttering to a semi-detached house adds £300–£700 for materials and labour.
Condition of the roof structure — If the old boards are hiding rotten rafter ends or damaged noggins, additional timber repairs will add cost. A good roofer will point this out before boarding over; be wary of anyone who doesn’t inspect the substrate.
Ventilation — Building Regulations require roof void ventilation equivalent to a continuous 10 mm strip at the eaves (Approved Document C). If the existing soffits were not vented, new soffits should include ventilation inserts or a vented soffit board. This adds very little to material cost but is important for the longevity of the roof structure.
Access difficulties — Bay windows, extensions, or tall chimneys that complicate scaffold erection increase costs. Properties on steep slopes or with limited access can add 15–25% to the scaffold element.
Signs You Need Replacement
- Paint peeling or timber boards visibly soft or crumbling when prodded
- Gaps appearing between boards and tiles or at joints
- Evidence of birds or squirrels nesting in the eaves
- Staining or moss growth spreading from the roofline onto the wall
- Gutters pulling away from the fascia (a sign the fascia itself is failing behind the fixing point)
A knowledgeable roofline contractor can carry out a free visual inspection from ground level and use a scaffold or ladder to confirm the condition before quoting. Do not accept a quote that is based solely on a drive-past assessment.
Choosing a Contractor
Roofline work does not require a specialist licence, but you should look for:
- A trader registered with a recognised trade body (TrustMark, Which? Trusted Trader, Checkatrade)
- Public liability insurance (minimum £2 million)
- A written guarantee on materials and workmanship (10 years is standard from established companies)
- Evidence they will check the rafter ends and roof structure as part of the job
Avoid door-to-door salespeople who pressure-sell on the day. Get three written quotes and check reviews on Google or Checkatrade before committing.
