Thatch is a different kind of covering from the tile, slate and lead we work with most days. It is built up from bundles of straw or reed, fixed in layers, and its working life depends on the plant it is made from, the pitch it sits on, how thick the coat is, how it is kept and the skill of the person who laid it. Those variables make a single quoted lifespan less useful than people hope.
For that reason the useful answer comes from the roof in front of you. A thatcher who has climbed it and probed the coat can say what it has left, and the questions near the end of this post help you get that answer in writing. Alongside it, we show how tile, slate, lead and membranes compare on published lives, and we set out the planning and consent points that matter if you own a thatched house, or plan to buy one, across the Hampshire and Surrey border country.
If you are weighing up whether to keep a thatched roof, repair it or change the covering, the questions and the consent route below are the useful part. They apply whatever the age of the thatch.
What sets the life of a thatched roof
Several factors act together, and a roof that does well on one can still fall short on another. These are the ones to ask a thatcher about.
The material
Thatch is laid in straw or in reed, and different materials behave differently. Ask which one is on the roof, and what its maker or thatcher expects of it in your situation. A figure given for one material does not carry across to another.
The pitch
Thatch sheds water by running it down the stems, so a steep roof clears water quickly and a shallow one holds it. Pitch is the first thing to measure on a thatched roof, as it is for any covering.
The depth of the coat
Thatch is worn away from the surface. A thick coat has more to lose before the fixings are reached, and a thin one is nearer the end of its life. A thatcher can tell from the surface and from the loft.
Shade, moss and damp
Trees that overhang a roof keep it wet, and moss and algae hold moisture against the surface. Roofs in shade tend to need attention sooner than ones in the open, although the right frequency is a matter for the thatcher.
The ridge
The ridge, the capping along the top, is the most exposed part and often comes up for renewal at a different point in the cycle from the main coat. Ask when the ridge was last done.
Birds and animals
Birds and rodents pull thatch apart, and wire netting is commonly laid over it to protect it. Ask whether the roof is netted and what condition the netting is in.
How other coverings compare on published life
The published guides give lives for the main non-thatch coverings. They make a useful benchmark when you are thinking about the long term.
| Covering | Typical life |
|---|---|
| Welsh slate | 100+ years |
| Clay tile | 60 to 80 years |
| Concrete tile | 40 to 50 years |
| Lead flat roof | 60 to 100 years |
| EPDM | 25 to 30 years (Less gives 30 to 50) |
| Felt, torch-on | 10 to 15 years (Less gives 10 to 20) |
How to use the table
It shows the scale on which roofing is measured. Slate and clay are measured in generations, concrete in decades and membranes and felt in decades or fewer. Thatch is renewed in stages, with the ridge and the weathered surface of the coat redone more often than the whole roof is replaced, so its working life reads better as a pattern of upkeep than as a single span.
Reading a thatch figure
When a thatcher or a seller quotes a number of years, ask what material it is for, what conditions it assumes and whether it is a typical figure or a promise. A warranty means something else from a lifespan, and a figure for one roof does not transfer to another.
For a fuller comparison of the longest-lasting options, see our post on the longest-lasting roof covering.
Consent for thatch in a listed or conservation setting
Thatch often sits on older houses, and those are the ones most likely to be listed or in a conservation area. The consent rules turn on the status of the building, not on the covering.
Listed buildings
Listed status leaves permitted development rights in place for roof alterations, yet section 7 of the Listed Buildings Act adds a separate listed building consent for any work that touches the building's character. A change from thatch to tile would clearly affect it. Even a like-for-like re-thatch may raise questions about material and style. Our guide to listed building roof replacement explains the route.
Conservation areas
Class C of the permitted development rules reaches re-roofing of a house, and unlike dormers it carries no exclusion for conservation areas. Article 4 directions can take rights away, though. Rushmoor has nine conservation areas, and its roof-related directions include Cargate in Aldershot, which covers chimneys and flues. For Hart, the 1998 directions cover works to a frontage roof slope on most of its conservation areas.
Repairs in Hart
Hart District Council tells owners of unlisted buildings that repair work needs no planning permission when it follows the original in method, detail and material. That is Hart's guidance for its own conservation areas, and a thatch repair that departs from the original falls outside it.
Check first
Ask the planning team of your council whether the property is listed or in a conservation area, and whether an Article 4 direction applies. The answer decides who you must ask before anything changes.
Changing the covering: what would be involved
Some owners consider replacing thatch with tile or slate, often after a high repair bill or a difficulty with insurance or lending. It is a significant change and worth thinking through.
The roof underneath
A thatched roof is built for thatch: steep, with rafters sized for it and no battens for tiles. Moving to tile or slate means checking the pitch against the covering's minimum, which runs from 12.5 degrees to 40 degrees across the Marley range and 20 degrees for natural slate under BS 5534, and then adding battens and underlay. The structure may need strengthening, so a structural check comes first.
Weight
The Planning Portal sets the Building Regulations trigger at a new covering that is 15 per cent or more heavier than the thatch or tile it replaces. Whether tile would do so depends on the covering and the thatch it replaces, and the surveyor works that out.
Consent
For a listed house, a change of covering needs listed building consent and is unlikely to be treated lightly. For an unlisted house, Class C may cover it, subject to conservation area and Article 4 checks.
Look and value
Thatch is part of the character of a house. Changing it changes the street, the value and the way the house is described. Weigh the decision against other options such as repair or a partial re-thatch.
Our part
We work on tile, slate, lead, flat roofs and the structure around a roof. If your project is a move from thatch to tile or slate, we survey the roof, explain what the structure needs, and a single written price follows.
Buying or owning a thatched house
If you are buying a thatched house, or have owned one for years without a recent inspection, the condition of the roof deserves a close look before you commit money or time.
Get a specialist survey
A general survey notes thatch and recommends a specialist. A thatcher can assess the coat, the ridge, the netting and the fixings. MyJobQuote puts a typical roof survey at around £300, with table rows of £100 to £200 and £200 to £350 (October 2026). A thatch inspection is a specialist visit and may be priced differently.
Ask for the history
Ask the seller for the dates of the last re-coat and ridge, the thatcher's name and any records of repairs. A roof with a recent ridge but a worn coat is a different proposition from the reverse.
Look at what the thatch meets
Chimneys, dormers and walls are the places where thatch meets other materials and where leaks start. Flashings there are often in lead, and a damaged one is a repair we can deal with. Our post on the life expectancy of a lead roof and the signs you need a new roof guide help you read those.
Check the paperwork
Look at the listing status, any conservation area and any consents on file. Tell your insurer and your mortgage provider what the roof is, since they will ask.
Plan for upkeep
A thatched roof is a covering that is looked after in stages. Allow for inspections and for ridge and coat work when they fall due, rather than leaving them until a leak forces the issue.
Questions to put to a thatcher
When you ask for a figure, ask these questions at the same time, and get the answers written down. They turn a vague number into one you can plan around.
Which material is there now, and which is planned?
The answer tells you which published expectations, if any, apply. Do not accept a figure for "thatch" in general.
How thick is the coat now?
The remaining depth is the best guide to how long it has left. Ask to see the measurement on a roof inspection and ask for it in the report.
When is the ridge due?
The ridge usually needs renewal sooner than the main coat. Find out when it was last done and what it will cost to renew.
What is the condition of the netting and fixings?
Failed netting lets birds in, and failed fixings let the coat slip.
What does the written price cover?
As with any roof, ask whether it includes scaffold, VAT and making good. Citizens Advice recommends getting at least 3 written quotes, and with thatch it helps to see a thatcher's recent work.
What does the insurer require?
Tell the insurer about the roof, ask what it expects, and keep the answer on file.
These are the same questions we put to any roof, and the roof replacement page explains how we answer them for tile and slate.
