Insulation in Corfe Castle
Loft, rafter and internal wall insulation on Purbeck stone cottages and the newer houses at the edge of the village.
The site visit is free and so is the written itemised quote. Thomas Hannen prices every job himself.
Last updated
On a stone cottage in Corfe Castle the insulation that pays is the layer you cannot see from the street, and the material has to be chosen so the building can still dry out. That means depth in the roof, a breathable build-up against solid stone rather than a sealed one, and the eaves left open enough to breathe. The newer houses on the edge of the village are a straightforward loft job and often a cavity wall question as well.
Corfe Castle cottages tend to lose heat in the far room and go damp in an overfilled loft. A cottage that costs a fortune to heat and still has a room at the end that never gets warm, usually one under the roof slope. And a loft that has gone damp since somebody stuffed it full of wool, with the eaves choked and water sitting on the timbers in the morning.
Both are fixable and neither is fixed by simply buying more material. We come out, get into the roof space properly, measure the depth, look at how the roof breathes and look at what the walls are made of. The site visit is free, the written itemised quote is free, and if the honest answer is that your loft is fine and the draughts are the problem, that is the answer you will get.
The work
Ventilation first, then depth
Getting depth into an old roof space. In Corfe Castle the roof spaces are small and awkward: a hatch over the stairs, purlins in the way, low eaves you cannot get a hand into and a ceiling of lath and plaster you must not put a foot through.
The work is mineral wool, ordinary eco roll, laid between the joists and a second layer across them at right angles, worked out to the wall plate rather than stopped short at the easy bit. Full depth is around 250 to 270mm, which takes a roof close to the 0.16 u-value a renovated roof is expected to reach.
Stone walls, and why the material matters more here. A rubble stone wall has no cavity and was built to take on damp and give it back to the air. Seal that with a foil faced board bonded straight to the inside face and you can trap moisture in the wall and push it out as damp on the plaster. An internal lining on a wall like that wants to be vapour open, wood fibre board and lime plaster rather than foam and gypsum, with a proper detail where it meets a window reveal or a joist end. With a conservation area over the village, external wall insulation is almost never the answer here.
Where an attic has been made into a room in the roof there is no loft left to lay a roll into, so the insulation goes between and under the rafters as rigid board, foil faced PIR, cut tight with the joints taped, or a multi-layer foil quilt such as TLX where a sloping ceiling has no headroom to lose. A dormer on the back is built as a warm roof, cheeks and flat top together. On an old roof there is often no membrane at all under the covering, so an air gap has to stay above the insulation rather than be assumed away. On the newer houses at the edge of the village it is more ordinary: roll between and over, boarding lifted and raised on legs, and a borescope in the cavity to see whether it has been filled and whether the fill has slumped.
A damp loft in an old Purbeck house usually has the same story behind it: wool pushed hard into the eaves, the air path blocked, and warm moist air arriving in a cold roof with nowhere to go. Vent trays hold the eaves gap open, and Approved Document F is the standard for that half of the job. Then an insulated and draught sealed hatch, lagging on the tank and on pipework now sitting above the warm layer, and covers over the downlighters.
How it runs
Insulating a stone cottage without trapping damp
Thomas prices insulation himself, and on a stone cottage the first thing he checks is how the building deals with damp. Solid stone and old roof spaces need to lose moisture, so the choice of material and the airflow count as much as thickness. His written quote gives separate lines to the survey, clearing out, the material and its depth or thickness, any ventilation work, and taking waste away. Survey to finish, you deal with one company.
Cottage lofts are usually reached through a small trap, so old insulation is bagged in the roof space and carried down with the stairs and landing sheeted. Nothing is left half done at night, and every bag goes with us. If there are damp timbers, cables buried under the old insulation, or an extractor discharging into the loft, Thomas shows you a photo and prices the fix separately before touching it.
Insulation inside the roof or on the inside face of a wall is invisible from the street, and on an unlisted house it needs no planning permission, though Approved Document L still applies where a thermal element is renovated. With so many listed entries in Corfe Castle, the chance that yours is one of them is high, and for a listed house listed building consent can be needed even where nothing shows outside. We ask at the survey. Dorset Council is the authority.
Cost
Stone, lime and access: what decides the price
Insulation in Corfe Castle is not priced per square metre. The same area can be a quick job or a slow one, depending on the building.
Getting into the space. A stone cottage with a trap over the stairs and eaves you cannot reach, a converted attic with no loft left at all, and a newer house at the edge of Corfe Castle with a drop down ladder each change the price before any work starts.
What is there now. Old material to bag and take away, storage to move and put back, and cables to lift clear all come before anything new goes in.
The right material. Mineral wool is fine in a ventilated loft. On a solid stone wall, a breathable wood fibre or lime-based lining costs more than foil-backed board, but foil-backed board on a damp wall can trap condensation behind it.
Ventilation. The eaves must stay clear, and an old roof with no underlay behaves differently from one with a modern breathable membrane. Approved Document L sets what the work has to reach.
Put these questions to another installer: what depth or thickness is being fitted, whether the old material is removed or covered, and whether the hatch, pipework and ventilation are included.
If it is urgent
Condensation, mould or a room that will not stay warm
Call rather than use the form. A loft dripping with condensation, mould that comes back as fast as you wash it off, or a cold room before a hard frost is worth a look soon.
In an old stone building, adding insulation to a space that cannot breathe makes things worse, so the first visit works out whether the problem is cold, damp or both, and what to tackle first. Keep the room aired and heated in the meantime. Insulation work runs Monday to Friday, 8am to 6pm. If your call goes unanswered, we phone back as soon as we can.
The one local thing
A conservation village, and most of it listed
Corfe Castle has its own conservation area and well over a hundred listed entries in and around it, which is a density you do not meet often. For insulation that rules one option out and changes another. Out goes external wall insulation: it thickens the wall, buries the window reveals and replaces a stone face with a rendered one, and in a conservation area appearance is controlled.
What changes is the inside work. On a listed building, internal alterations that affect the character of the place can need listed building consent in their own right, and that can include lining an original wall, boxing in a beam or cutting into a lath and plaster ceiling, even though a passer by would never know.
What this means in practice is that the order of work here is different from an ordinary house. Start with the roof, because loft insulation over the ceiling joists is reversible, does not touch the historic fabric of the walls and is rarely contentious. Then draughts, then pipework, then secondary measures at the windows.
Leave the walls until last and get the consent question answered before anyone prices them. When a wall does get done, ask for a vapour open build-up in writing. A cottage that has stood for centuries has been drying outwards the whole time, and the fastest way to give an old building a damp problem it never had is to wrap it in something that stops it.
Who you are dealing with
The firm that insulates houses in and around the village
We cover Corfe Castle and the villages round it, Kingston, Church Knowle, Harmans Cross and Stoborough, and out towards Wareham; the drive from Boscombe is around eleven and a half miles. Dorset Council is the authority for planning, listed building consent and building control.
Thomas Hannen owns the firm, and he surveys the house and prices the insulation himself. The company is Bournemouth Roofing & Building Ltd, number 15471719, registered in England and Wales. On Checkatrade you will find a verified customer's rating of 10 out of 10. We do the survey visit for free, and the written, itemised quote costs you nothing. Before you book a visit in Corfe Castle, you can read our customers' Google reviews, word for word, on our reviews page.
Planning at a glance
Do you need planning permission in Corfe Castle?
Most repairs in Corfe Castle need no application at all. What decides whether a change to the outside of your house does is who the council is, whether a conservation area or a listing applies, and whether the place sits in a protected landscape.
| Question | In Corfe Castle |
|---|---|
| Who decides | Dorset Council is the planning authority for Corfe Castle. Dorset Council's heritage pages set out what it controls. |
| Conservation area | Yes: Corfe Castle Conservation Area. Check whether your street is inside the boundary before changing anything visible. |
| Listed buildings | Yes, there are listed buildings in and around Corfe Castle. If yours is one, work can need listed building consent. |
| Protected landscape | Inside the Dorset National Landscape (formerly AONB), so anything visible from outside gets more attention. |
Questions
Questions about insulation in Corfe Castle
There are 134 listed entries here. Is mine likely one?
Yes, your house being listed is a real possibility in Corfe Castle. Corfe Castle carries 134 listed entries in a small village, which is an unusual concentration, so plenty of houses are individually listed instead of simply sitting inside the conservation area. Listing does not rule out insulation. It changes what may be fixed to the historic fabric and means Dorset Council need to consent to the work before anything goes up into the roof.
Would a room in the roof need extra approvals here?
It can. Corfe Castle sits in the Poole Harbour nutrient catchment, but that engages on a new dwelling or separate overnight accommodation such as a holiday let, and a bedroom in the roof of your own house does not normally bring it in. The conservation area does, and for a listed house so does listed building consent. Insulating the roof space you already have triggers none of it. The two jobs get confused because both involve someone with a tape measure in your loft.
Can we insulate the walls from outside in the conservation area?
Almost certainly not, and it would be the wrong thing for the building anyway. Wrapping a solid wall in board and render changes the appearance, which is exactly what the Corfe Castle conservation area controls, and Dorset Council would want an application. Old walls also need to pass moisture outward. Internal lining on the coldest rooms, done in a breathable build up, is the realistic route here.
What do you check in an old Corfe Castle roof?
Before anything else the survey checks whether the ceiling below is lath and plaster and can carry weight, whether the eaves still have an air path, and whether the timbers are dry. In a village where the conservation area and Dorset Council control the outside, the answer is nearly always to work from inside, so the condition of the inside is what decides the specification. Thomas does that survey himself.
Can this be done without us moving out?
Yes for a loft. The work happens above your head and the only disruption downstairs is the ladder position and a sheeted route to the front door. Internal wall lining is different, because the room being lined has to be emptied and it goes room by room. In a listed house in Corfe Castle we also agree with you where materials can be stacked before the first day.
Nearby, and next door
Insulation near Corfe Castle
Nearby places we also cover for insulation, with straight-line distances from Corfe Castle, and the other trades we offer in Corfe Castle itself.
Insulation nearby
Our other trades in Corfe Castle
Insulation guides
Part L: do you have to insulate when you re-roof? Black mould on walls: what causes it and what stops it PIR board vs mineral wool: which insulation?Everything we do in Swanage Insulation, all areas Every area we cover
Free quote
Get a straight answer about your roof space
A free site visit, the depth and the ventilation both checked, and a written itemised quote for the work that is genuinely worth doing.