Refinishing Floors in a Pre-War Rowhouse or Colonial

A Federal-era rowhouse in Georgetown, a Capitol Hill flat, a craftsman bungalow in the Hyattsville Arts District, a colonial in Old Town Kensington, an Old Town Alexandria townhouse — different houses, same set of surprises under the carpet. Old floors are not new floors with more character, and the difference is not sentimental. It changes the abrasives, the sequence, the repair method and, quite often, the answer to whether the floor can be sanded at all.

Here is what we look for before a machine is switched on in a pre-war house.

First: how much wood is actually left

Sanding is a one-way decision. A floor laid in 1915 may have been refinished three or four times already, and each pass took wood. What matters is the thickness remaining above the tongue — once you sand into the tongue, the boards lose their edge support and the floor is finished.

We measure it rather than estimate it, at a register, a threshold or a heating grate. Sometimes the honest answer is that the floor has one pass left and it should be saved for later, and the right work now is a screen and recoat. Our guide to refinishing or replacing covers that decision.

Second: what the old finish is

This is the check that separates people who work on old houses from people who do not.

Shellac was the standard finish before the middle of the twentieth century, and a great many original DMV floors still carry it under later coats. Wax over shellac was equally common. Both behave nothing like polyurethane under a sander: wax melts, clogs the abrasive and drags contamination across the wood, and shellac loads paper quickly. Attacking either with a modern grit sequence is exactly why some old-house refinishing jobs come back blotchy or refuse to take stain evenly.

Identifying it takes a minute in a closet — alcohol softens shellac, mineral spirits lift wax — and it changes the whole plan. Where wax is present, the wood has to be cleaned before it is sanded rather than sanded and hoped for.

Third: what species you actually have

Pre-war DMV floors are mostly red oak strip, but not always, and the exceptions matter.

Old-growth heart pine turns up in the oldest rowhouses and in Alexandria townhouses. It is softer than oak, so it dents where oak would not, and it needs a gentler abrasive sequence and a careful hand at the edges. In return it takes finish beautifully and has a color no modern board reproduces.

Quarter-sawn white oak appears in better houses of the period, with the ray fleck that is the whole reason people wanted it. Sanding it flat and finishing it with a clear coat shows that figure; a heavy stain buries it. See our notes on species for how different woods take color.

Narrow strip oak in a herringbone or a bordered pattern is common in the grander Chevy Chase and Kalorama houses. Patterned floors cannot be sanded in one direction, which slows the job considerably and rules out an inexperienced crew.

Fourth: the things a hundred-year-old floor hides

• Cut nails and old fasteners that have worked their way proud. Every one has to be set below the surface before a drum goes over it, or it tears the abrasive and marks the floor.
• Radiator footprints and pipe notches. Steam radiators leave stained rings and sometimes rotted boards, and removed radiators leave holes in the field of the floor.
• Previous patches in a different species or a different board width, usually where a wall or a chimney breast was removed.
• Black staining around former plant pots, pet areas and the bottom of stairs. Black means moisture reached the wood and the tannins reacted; it is often deeper than a sanding will reach.
• A floor that is not level because the house has settled. In an old rowhouse the goal is a floor that is flat and consistent, not one that is level to a laser — chasing level can mean sanding straight through the boards at one end of the room.
• Carpet tack strip damage around the entire perimeter, and the staples from the pad, which have to come out one at a time.

Repairs: salvage before you buy

Where boards have to be replaced, new stock rarely matches — the grain is different, the growth rings are wider, and modern kiln-dried oak sits differently against century-old wood even under the same stain.

The better method is to lift replacement boards from a closet, from under a permanent appliance or from a low-visibility room, use them in the visible repair, and put the new stock in the hidden spot. Wood that aged in the same house under the same conditions matches in a way nothing bought can. It takes longer and it is worth it.

Dust, in an occupied house

Rowhouses and older colonials are full of the places dust loves — open stairs, transoms, plaster mouldings, forced-air returns without filters. Containment matters more here than in a modern house, both for the mess and because a pre-1978 house means lead paint on the trim is a real possibility and disturbing it is a regulated activity.

Ask specifically how a contractor contains dust, whether they seal the HVAC returns, and how they handle work near painted trim in a pre-1978 building. A vague answer is an answer.

Finish choices that suit an old floor

Two thoughts, both about not making a 1920 floor look like a 2026 one.

Sheen. A high gloss on an old floor looks wrong immediately, and it advertises every dent the house has earned. Satin or matte suits period wood, and it hides the honest irregularity you actually want to keep.

Color. Very dark stains on old oak look dramatic in photographs and show every scratch and every speck of dust in real life. Natural or a light warm tone lets the wood be its age. Our guide to finishes and sheen covers the options, and choosing a stain color covers what your species will do to them.

Frequently asked questions

We do a lot of this work across DC, Alexandria, Kensington and Hyattsville, and we would rather protect a floor's remaining life than take it all in one pass. Request a free in-home estimate and we will measure what is left, identify what is on it, and tell you what the floor can take.