Begin with the bones of the building

Before you choose paint colours or hunt for a roll-top bath, spend time understanding what your cottage actually is. Old cottages were built to breathe. Many have solid walls, no damp-proof course, and materials that manage moisture in a completely different way from a modern house. A standard mortgage survey will not tell you enough. Commission a building survey from someone experienced in historic buildings, and check whether the cottage is listed or sits in a conservation area. Listed building consent may be needed for work that seems minor, including some insulation and window changes.

Walk the building in different weather. Note where rain runs, where damp patches appear, how the wind moves through gaps, and which rooms feel cold. These clues tell you where to spend money and where to tread carefully.

Research local materials and methods

Every region of Britain has its own building palette. In the Cotswolds you will find oolitic limestone and stone slate. In East Anglia, clay lump, flint, and pantiles. In the Pennines, millstone grit and heavy stone slates. In Devon and Cornwall, cob, slate, and thatch. Find out what your cottage was built with, then repair in kind. Visit local churches, farm buildings, and old boundary walls for reference. Talk to conservation officers, architectural salvage yards, and builders who regularly work on old fabric.

The guiding principle is breathability. Use lime mortar and lime plaster rather than cement and gypsum. Cement traps moisture inside old walls, which then freezes, cracks, and rots timber. Lime allows walls to move and dry out. For pointing, choose a soft lime mortar matched to the original in colour, strength, and texture. For internal plaster, lime or clay plasters are usually the right choice.

• Lime for mortar, plaster, and render — available as putty, hydraulic, or natural hydraulic lime.
• Stone from local quarries or salvage, matched for colour and size.
• Timber for structural repairs: oak, elm, or pine, depending on age and location.
• Insulation that can dry out: wood fibre, sheep's wool, hemp, cork, or cellulose.

If you cannot find an exact match, choose a compatible material over a perfect-looking one. A slightly different stone is far better than a cement patch.

Retain and repair original features

Original features are the soul of a cottage. Exposed beams, inglenook fireplaces, flagstone floors, plank doors, old windows, carved staircases, and uneven plaster all carry the story of the building. Resist the urge to strip, sandblast, or replace them. Repair instead: splice new timber into a rotten beam, re-point with lime, repair shutters, and re-glaze windows rather than swapping them for plastic. If you must alter something, record it, store removed pieces, and keep changes reversible.

Do not remove features simply because they are inconvenient. A low beam, a narrow staircase, or a small window may frustrate modern life, but they are part of the cottage's character. Work around them with discreet lighting and thoughtful furniture placement. Be careful with floors, too. Do not seal old stone or brick floors with plastic. Let them breathe, and keep ventilation paths open.

Improve insulation carefully, not aggressively

Old cottages are draughty and cold, but sealing them up too tightly can cause damp and rot. The aim is to slow heat loss while allowing moisture to escape. Start with the cheapest and least invasive measures:

• Draught-proofing — fit brushes and seals to doors and windows, and use a chimney balloon when the fire is not in use.
• Loft insulation — use breathable batts or loose fill, but keep eaves ventilation clear. Never block airflow at the roof edge.
• Solid walls — avoid cement render and rigid foam. Use breathable insulation such as wood fibre or cork, finished with lime plaster. External insulation may be possible with consent, but it changes the building's appearance.
• Windows — secondary glazing, thermal curtains, shutters, and heavy linings make a real difference. If replacing, choose slim double-glazed units in timber frames, subject to consent.
• Floors — insulate under suspended timber floors with breathable materials, but maintain airflow beneath.

Always think about moisture. If you add insulation, make sure water vapour can still escape. A hygrothermal survey can help you avoid trapping damp. Never use spray foam on old timbers or walls.

Sequence the work and plan for services

Old cottages usually need new services: wiring, plumbing, heating, and drainage. Do this work before insulation and finishes, but after the roof is watertight. A sensible sequence is:

• Survey, permissions, and a clear plan.
• Roof, gutters, and drainage — keep water out first.
• Structural repairs.
• Services first fix: electrics, plumbing, heating.
• Insulation and draught-proofing.
• Plastering, joinery, and finishes.
• Second fix and decoration.

If you can, live in the cottage for a year before major work. You will learn how it behaves in winter and summer, where the cold settles, and which rooms need the most attention. Budget a contingency of at least 15–20%. Old buildings always reveal surprises once walls are opened. Find a builder who understands historic fabric, not one who wants to modernise everything. Ask for references and visit previous projects.

Modern comfort is still possible. Underfloor heating can work with breathable floors if carefully designed. Radiators in the right places, a wood-burning stove, and good curtains make a cottage cosy. A heat pump may suit some cottages once insulation and draught-proofing are improved, but take expert advice first. Keep ventilation in mind — old cottages need to breathe. Be patient. A sympathetic renovation is a marathon, not a sprint, and the result is a home that feels warm, honest, and rooted in its place.