What rooflights and skylights cost in Liverpool

Rooflight costs in Liverpool depend far more on the roof than on the unit. Two people can ask for the same size of skylight and end up with very different jobs: one is a straight swap into an existing opening on a bungalow you can reach from a short tower, the other is a new opening through a slate roof three storeys up a Victorian terrace with a trimmed rafter and a plastered reveal to finish. A figure on a web page cannot tell those apart, so we do not publish one. Skylight prices in Liverpool that look tidy online usually leave out the parts that make the real difference.

What we can do is show you what moves the cost, so the quote you get from us makes sense line by line. Everything below is something a surveyor looks at on your roof. When you know what they are checking, you can also judge any other quote you get.

Every quote we write is built from the same handful of parts. Some jobs carry all of them, some only two or three.

The unit itself

Size matters, but so does type. A fixed flat-roof rooflight is a simpler product than an opening one with a motor, and a pitched roof window comes with a flashing kit matched to the roof covering. Frame material changes things too: aluminium, uPVC, timber with an aluminium cladding, or a slim steel-look conservation frame. Bigger is not always dearer per square metre, but very large single panes need heavier glass and more handling on site.

The glazing specification

Every rooflight we fit for an existing home has to meet Part L of the Building Regulations. A roof window must reach 1.4 W/m²K, or sit in Window Energy Rating band B. For rooflights and roof lanterns it means 2.2 W/m²K. Meeting those figures is the starting line. On top of that you can choose triple glazing, solar-control coatings that cut summer heat, self-cleaning outer glass, laminated inner panes for safety over a bed or a stair, or obscure glass for a bathroom. Each option adds to the unit cost, and we only suggest the ones that suit the room. There is more on the figures in the Part L and U-value guide.

Opening, electric or fixed

A fixed rooflight lets in light. An opening one also lets out steam and heat, which matters in kitchens and bathrooms. Manual opening is the simplest. Electric opening needs a power supply to the unit, a switch or remote, and often a rain sensor that closes it when the weather turns. Solar-powered versions avoid running a cable but can cost more as a product. Where a cable is needed, its route from the nearest supply affects the labour.

Getting to the roof safely

Access is one of the biggest variables and the one people least expect. A single-storey extension can often be worked from a tower or a short run of scaffold at the back. A back-slope roof window on a two-storey semi may need a scaffold tower or edge protection. Front slopes over a pavement, three-storey townhouses and roofs above a neighbour's extension can need a full scaffold, sometimes with a licence from the council if it stands on the highway. Narrow entries and back alleys, common behind Liverpool terraces, add carrying time for scaffold and for the unit itself.

The roof covering

Natural slate takes longer to cut back and re-lay around a new frame than concrete interlocking tile, and slates often break as they come off, so we allow for matching replacements. Plain clay tiles sit somewhere in between. On a flat roof, the covering decides how the kerb is weathered: torch-on felt, EPDM rubber and GRP fibreglass each need a different detail and sometimes a different trade. If the existing flat roof has few years left in it, cutting a hole in it is the moment to talk about re-covering, and we will say so plainly in the quote.

Structure and trimming

Fitting a new roof window usually means cutting one or more rafters and trimming the opening with new timbers either side so the load goes round it. On a cut timber roof that is routine carpentry. On a roof built with trussed rafters, which covers most houses built since the 1970s, trusses should not be cut without a design from a structural engineer, so we either pick a width that fits between them or allow for the engineer's design and the extra timber. Flat roofs need a trimmed opening in the joists and a kerb built to the right height. Roof lanterns sit on an upstand that has to be level and strong enough for the weight of the glass.

Making good inside

Once the window is in, the inside needs finishing: new plasterboard linings to the reveals, insulation packed round the frame, a vapour control layer where the maker requires one, plaster or skim, and sometimes a lined shaft through a loft space to a ceiling below. Decorating is quoted separately if you want us to do it. A swap into an existing finished opening often needs little inside work. A new opening through a bedroom ceiling needs a lot.

Building Control

A new or replacement rooflight counts as building work that must be notified. We handle the notification, either with the council's building control service or with a registered building control approver, and the fee for that is set by them, not us. It appears on our quote as its own line so you can see it. In Flintshire and the Wrexham area the same applies under the Building Regulations as they apply in Wales. Our guide to rooflights and Building Regulations lists the points an inspection covers.

Removing the old unit

On a replacement, the old rooflight, its glass and any rotten trim come out and leave with us. If the opening is the same size, the new unit goes back in with less structural work. If it is a different size or the timbers around it are soft, the opening is adjusted first.

Each type of rooflight has one or two things that dominate its cost. These are the ones our surveyors spend most time on.

Replacing a rooflight is not always cheaper than fitting a new one, though it often is. The deciding question is whether the opening and its weathering can be reused.

When an old VELUX or similar roof window has misted, the maker may still make a replacement sash or a direct-fit unit in the same size code, and the job becomes a quick, tidy swap with a new flashing kit. When the old unit is a non-standard size, or the maker no longer supports it, the opening has to be changed to suit a current size, which brings back trimming and making good.

On flat roofs, older dome rooflights and polycarbonate units often sit on kerbs that are too low or poorly insulated. Replacing the unit properly can mean raising the kerb, which means re-weathering the roof covering around it. Sometimes only the sealed glass unit in a frame has gone while the frame is still sound; then a new glass unit can be cheaper than a whole new rooflight. Our guide on new glass or a new rooflight sets out how we decide, and the answer on what it costs to replace a skylight covers the rest.

Some costs only show up once a roof is open. We would rather tell you about them now than surprise you later.

• Rotten battens, rafters or decking found under the covering
• Slates or tiles that break and need matching
• Electric cable or pipework running through the planned opening
• Loft insulation that has to be moved, replaced or topped up
• Asbestos-containing materials in older flat roofs or soffits
• A flat roof covering too far gone to weather a new kerb into

Our surveyor looks for each of these and prices what can be seen. Hidden items are named in the quote as possibilities rather than left out. If one of them turns up, we pause, walk you through it, set out the choices and get your written agreement to any change before carrying on. You are never handed a bigger bill at the end for something you did not agree to.

Asbestos is a separate case. If we suspect it, the material is tested, and any removal is done by a specialist before our work goes ahead.

Most rooflights on houses in England are permitted development, which means no planning application and no planning fee. That changes for flats and maisonettes, for listed buildings, and where an Article 4 direction removes those rights, as councils often do in conservation areas. Some newer estates also have planning conditions that take permitted development away. If your job needs an application, the council's fee is yours to pay and sits outside our quote, but we explain what is likely to be needed at the survey. See do I need planning permission for a skylight for the conditions.

If you live in a leasehold flat, the freeholder or management company will usually need to agree to the work. That takes time rather than money from us, but it is worth starting early.

Every price we give follows the same route, and it starts with seeing the roof.

1. Survey first. One visit covers it: we view the roof from both sides, take measurements, and assess access, structure and covering.
2. Itemised in writing. The quote names the unit, size, glazing, opening type, access method, structural work, making good and the Building Control fee as separate lines.
3. Fixed once accepted. The figure does not change unless you ask for something different or an unseen problem is found and you agree the change in writing.
4. Options shown side by side. Where there is a real choice, such as fixed or electric, we price both so you can compare.
5. Nothing ordered until you say so. Units are only ordered after you accept the quote in writing.

The quote is free, and there is no pressure to decide on the day. Our get a quote page explains what happens after you send the form.

Every service also gets a cost page that digs into the drivers that matter for that type.

• How much a roof lantern costs to fit
• How much a flat roof skylight costs
• The cost of fitting a roof window
• What a VELUX window costs to install
• The cost of an electric opening rooflight
• What a misted rooflight unit costs to replace
• How much a walk-on rooflight costs
• The cost of a conservation rooflight
• What a sun tunnel costs to install

For energy efficient glazing, the questions are more about which specification earns its keep; our guide to double or triple glazed rooflights covers that.

When you are ready for a real figure for your roof, send us a few details and a photo or two. Get a fixed written quote