Rotten timber fascia is most obvious when guttering starts pulling away from the wall, because the board behind can no longer hold the bracket screws. uPVC replacement lasts twenty-five to thirty years with no repainting. Expect £700 to £1,200 for full roofline on a Darlington semi.
The fascia board runs along the roof edge at the eaves, supporting the bottom course of roof tiles and the guttering. The soffit fills the gap between the fascia and the wall. On most Darlington properties built before the 1990s, these were timber — and 30–50 year old timber fascia and soffit is one of the most common roofline replacement jobs we carry out.
How to Tell if Fascias Need Replacing
- Gutters pulling away from the wall — the fascia behind them has rotted and can no longer hold the gutter bracket
- Soft or crumbling wood visible on the fascia face — particularly common where the bottom of the fascia meets the soffit
- Peeling paint that keeps coming back despite repainting — a sign of moisture in the timber beneath
- Visible damp patches on the ceiling of the top floor, near the eaves — soffit rot can allow water directly into the roof structure
Where a roof void relies on ventilation to control condensation, the ventilation openings at eaves level must provide a free area equivalent to a continuous ten millimetre gap along the full length of the eaves.
Source: BS 5250:2021 — Management of moisture in buildings: roof void ventilation
uPVC Replacement: What's Involved
uPVC replacement involves removing the existing timber fascia and soffit (or over-capping where the timber is sound enough), fixing new uPVC fascia boards with proper support, and installing ventilated soffit panels where the roof requires cross-ventilation.
Guttering is almost always replaced at the same time — the old guttering has to come off to access the fascia, and refitting old brackets into new fascia board is false economy. Most roofline replacements therefore combine fascia, soffit, bargeboard and guttering in a single visit.
How Long Does uPVC Fascia Last?
Quality uPVC fascia and soffit typically lasts 25–30 years with no maintenance beyond an occasional clean. Unlike timber, it won't rot, blister or need annual repainting. The main failure mode is impact damage or UV colour fade on cheaper products — we specify quality uPVC with manufacturer warranties.
Costs for Darlington Properties
A standard 3-bed semi in Darlington with fascia, soffit, bargeboard and new guttering combined typically costs £800–£1,500 depending on the size of the property and the access. We provide itemised written quotes before starting any work.
Ventilation Requirements When Replacing Soffits
Replacing soffits on an older Darlington property introduces a ventilation consideration that is frequently overlooked. Pre-1990 properties with non-breathable felt underlay rely on air circulation through the eaves soffit gap to prevent condensation within the roof space. If solid soffits are fitted without ventilation provision — or if vented soffits are fitted but the ventilation apertures are blocked by insulation pushed into the eaves — condensation can build up in the roof void, leading to timber decay and eventually the same damp symptoms the soffit replacement was meant to resolve.
We assess ventilation requirements as part of every soffit replacement job on pre-1990 properties. Where non-breathable felt is present and the existing soffit had open ventilation, we specify vented soffit panels with a minimum free area of 10mm equivalent continuous ventilation. On post-2000 properties with breathable membrane underlays, a specific soffit ventilation requirement may not apply, but we'll confirm at survey rather than assuming.
Colour and Profile Choices
uPVC fascia and soffit is available in a range of standard profiles and colours. White is the most common and remains the appropriate choice on most Darlington residential properties. Woodgrain finishes are available and are sometimes preferred on 1930s and period properties where solid white plastic looks visually incongruous alongside the brick and tile of the original construction. Anthracite grey has become popular on modern properties with grey window frames and roofline — the colour matching across fascia, soffit and window frames gives a more considered appearance on modern housing.
Profiles vary in depth from standard 100mm fascia board to 150mm and 200mm on larger properties. The correct profile depth is determined by the rafter overhang and the visual proportion of the fascia relative to the wall below. We confirm profile choice at survey rather than defaulting to a single standard width across all jobs.
How Fascia and Soffit Failure Causes Wider Damage
The fascia and soffit are structural elements, not just cosmetic ones. The fascia board carries the lowest course of roof tiles at the eaves — if it rots, the tiles lose their structural support and the lowest course can slip or lift in wind. More commonly, rotten fascia means rotten gutter fixings: the screws that hold gutter brackets pull through rotted timber and the gutter drops away from the wall, directing overflow straight down the wall face rather than through the downpipe.
The soffit provides the underside closure of the roof overhang. When it rots, it creates an open gap between the fascia and the wall — a gap that allows birds and rodents to enter the roof void. On a significant proportion of Darlington properties where we replace rotten soffits, we find evidence of bird or rodent access through the failed soffit: nesting material, droppings, or in some cases active occupation. The cost of pest clearance and damage repair from a few years of unchecked access can exceed the cost of the soffit replacement that would have prevented it.
Timber Condition Assessment Before uPVC Installation
Before any uPVC fascia installation in Darlington, we assess the condition of the existing timber — both the fascia board itself and the rafter feet behind it. Rafter feet that have been exposed to water from overflowing or leaking gutters may have begun to decay even if the fascia board is still superficially sound. A prodded test with a screwdriver reveals whether the timber behind the surface is solid or has begun to soften.
Where rafter feet show early rot, treatment with a wood hardener and end-grain preservative before covering with uPVC extends their life significantly. Where rot has progressed to the point where the timber is structurally compromised, a new rafter foot plate can be bolted alongside the existing one before the new fascia is fixed. This adds cost to the job but prevents the situation where a new uPVC fascia is fitted over a rafter foot that fails structurally five years later.
On Darlington properties from the 1970s and 1980s, the original fascia boards were often 25mm softwood — a specification that was adequate when the gutters were cast iron and properly fitted, but which has frequently rotted from the repeated overflow events caused by undersized uPVC replacements. These properties benefit from upgrading to 19mm or 25mm cellular foam uPVC board rather than thin 9mm capping over the original timber.
Colour and Profile Selection for Darlington Properties
White remains the most appropriate choice for the majority of Darlington residential properties. It's neutral, widely available in all profiles, and looks correct on both Victorian terraces and post-war estates. Woodgrain foiled finishes — rosewood, golden oak, and similar — can work well on 1930s properties where solid white plastic looks incongruous against the warm brickwork and period detail of the original construction. Anthracite grey has become popular on modern housing where aluminium window frames and grey roof tiles are already present — the consistent dark colour across the roofline creates a more deliberate aesthetic than mixing grey windows with white fascia.
Profile selection matters more than many homeowners realise. Standard 100mm fascia board is appropriate for small eaves overhangs. Where rafter tails project significantly — common on 1930s Darlington semis with their distinctive wide eaves — a 150mm or even 200mm fascia board is needed to properly cover the overhang and give correct proportions. Fitting undersized fascia board on a wide-eaved property looks wrong and may expose timber that should be covered.
The Ventilation Calculation
For pre-1990 Darlington properties with non-breathable felt underlay, the ventilation requirement at the eaves is defined by BS 5250. The minimum free ventilation area required is equivalent to a continuous 10mm gap along the full eaves length. In practice this is achieved by: a 25mm gap between the top of the soffit and the underside of the tilting fillet (for open-eaves construction), or by vented soffit panels with an adequate free area (for closed-eaves construction).
The most common ventilation error during soffit replacement in Darlington is blocking the existing ventilation gap with new soffit boards, then fitting small circular vents at 600mm centres that don't provide equivalent free area. We calculate the required ventilation for each property before specifying the soffit panel, and fit vented panels with sufficient open area across the full eaves length rather than relying on point vents that may be inadequate.
Guttering Integration
Replacing fascia and then reusing existing guttering is rarely cost-effective on Darlington properties. The existing guttering has to come off to access the fascia, and the old gutter brackets must be removed from the old fascia and refixed into the new board. Old gutter bracket screw holes in the new fascia are a future water ingress point. And old guttering refixed to a new fascia often sits at a different angle to the one it was originally fitted at — sometimes creating drainage falls that work against the flow rather than with it.
The standard approach in Darlington is to replace fascia, soffit and guttering as a package. The marginal additional cost of new guttering when scaffold is already in place and the fascia is already stripped is significantly less than the cost of a return visit to fix guttering problems that arise from reusing old gutter sections on new fascia board. We quote the combined package as standard and detail the guttering specification separately so the cost comparison is clear.
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Call 01325 000 000 Get a Fascia QuoteLast reviewed: 22 July 2026 · Written and maintained by Darlington Roofing Experts · 01325 000 000