What You're Actually Working With

Most Victorian fireplaces follow the same basic recipe. There's a cast iron insert at the centre — either a register grate with a hinged damper or a tiled insert with decorative cheeks. Either side, you'll usually find a pair of tiled slips, typically three or four 150mm tiles stacked vertically. Around all that sits a surround in slate, marble or painted pine, and at the base a hearth of quarry tiles or a marble slab. Chimney breasts in Victorian terraces were built to draw, so the proportions are forgiving.

What you'll often find instead is a century of gloss paint over black lead, cracked tiles, and a surround that's been overpainted so many times the mouldings have gone soft. None of that is fatal. Cast iron is remarkably forgiving, and most of the damage you'll encounter is cosmetic rather than structural.

Your Kit, and Your Safety

Before you buy anything else, sort out protection. Paint on a fireplace installed before the 1960s may contain lead, and sanding or heating it is the worst thing you can do. Buy a lead testing swab kit — they're cheap and take minutes.

• P3 respirator and eye protection, not a paper dust mask
• Nitrile gloves — solvent strippers will eat latex
• Gel-based paint stripper, a small tin is plenty for one fireplace
• Wire wool in 0000 grade, plus a stiff hand brush and a plastic scraper
• White spirit for cleaning residues, and old jam jars to decant into
• Graphite polish (often sold as black lead substitute) and a soft buffing brush
• Heat-resistant fire cement and a tube of lime mortar for pointing

Work with windows open and no pilot lights or open flames anywhere near you. Solvent strippers give off heavy fumes that sink to floor level, so keep the room ventilated throughout and well after you finish.

Assessing It Before You Touch It

Give the fireplace a proper look before you attack it. Run your fingers along the cast iron, feeling for cracks — particularly around the fireback and the grate bars. A hairline crack in a decorative element is fine to live with. A crack through the fireback means the piece is decorative only, and you shouldn't light a fire in it.

Check the chimney too. Has it been swept? Is it capped or lined? You cannot safely light a fire until you know, and a sweep is a small cost compared to smoke damage. Photograph everything as you dismantle it, and keep screws and fixings in labelled bags — you will not remember which went where.

Removing Paint from Cast Iron

This is the slow, satisfying part. Work in patches of about 30cm square rather than trying to do the whole thing at once. Brush the gel stripper on generously with an old brush, working it into the crevices, and leave it for the time stated on the tin — usually 20 to 40 minutes for multiple coats.

Lift the softened paint with a plastic scraper, then scrub the detail with 0000 wire wool. Resist the temptation to use a wire cup brush on a drill; it will round off the crisp edges of the casting that give Victorian iron its character. Repeat as many times as it takes. Once the iron is bare, wipe it down with white spirit and let it dry fully.

Then polish. Apply graphite polish sparingly with a brush, work it into the detail, leave it to dull slightly, and buff with a soft brush. Two thin coats beat one thick one, and the finish will deepen over time.

Tiles, Surrounds and Hearths

Glazed Victorian tiles clean up beautifully with warm water, a drop of washing-up liquid and a bicarbonate of soda paste for stubborn grime. Never use an abrasive pad on glaze. Encaustic tiles — the unglazed, patterned sort — are porous, so use a barely damp cloth and finish with a thin coat of boiled linseed oil to feed the surface.

For limescale, try white vinegar or a citric acid solution on a small test patch first. Repoint tired grout with lime mortar, not cement; lime moves with the building and won't trap moisture against the tiles. Slate surrounds respond well to warm soapy water and a wipe of oil. Marble needs a pH-neutral cleaner only — anything acidic will etch the surface permanently. If you're laying a new hearth, quarry tiles sealed with boiled linseed oil look right and wear well.

Reassembling and Living With It

Bed the insert back into the opening with fire cement, sealing the gap between the iron and the surround so nothing draws smoke into the room. Reassemble the slips and surround, checking that everything sits plumb, and leave the cement to cure for at least 24 hours.

When you first light a fire, keep it small — kindling and a couple of logs — and build up gradually over several days. This cures the cement and settles the iron without shocking it. After that, an annual sweep and a twice-yearly polish will keep the whole thing looking handsome for decades. There is something quietly satisfying about a fireplace that has already outlived several households and is now, thanks to a few evenings' work, ready for yours.