Exterior Door Replacement
An exterior door is a moving part in a wall that never stops moving. Almost everything that goes wrong here traces back to the threshold, the bottom of the jamb, or a shifting slab.
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Overview
Exterior Door Replacement
The first decision is whether you’re buying a door or a door assembly. A slab replacement is just the panel, hung on the existing jamb with the existing hinges, existing strike and existing threshold. A pre-hung unit brings the jamb, sill, weatherstrip and threshold with it. Across the Houston metro, the failure is usually in the parts a slab replacement leaves behind — the bottom of the jamb legs and the threshold — which is why pre-hung is so often the honest answer.
Water is the recurring villain. On an entry without much overhang, wind-driven rain hits the door face, runs down and collects exactly where the jamb meets the sill. Without a sloped pan flashing under that sill and a functioning sweep on the door bottom, the water goes into the framing and the sill plate. Adjustable thresholds and door bottoms are consumables in this climate; they need adjusting and eventually replacing, and that’s normal rather than a defect.
Then there’s the movement question. Expansive clay soils lift and drop slabs seasonally, and a door frame is a sensitive instrument for detecting it. A door that binds every humid summer and frees up in winter is a swelling problem. A door with an even gap on top and a wedge-shaped gap at the latch, whose deadbolt now has to be lifted to throw, is a racked opening. Those two symptoms look similar from the doorway and need completely different work.
The things that actually decide this job
Pre-hung units fix the part that actually failed
Rot starts at the jamb bottom, at the exterior brick mould, and behind the threshold, where end grain sits in splash. A slab-only swap leaves all of it in place, and the new door then has to seal against a jamb that has moved. Pre-hung units also let you specify composite or PVC jamb legs that don’t wick. Confirm jamb depth matches your wall thickness, or the casing won’t sit flat.
Water management at the sill
Under the sill belongs a pan flashing that slopes outward with end dams turned up at both sides, so anything that gets past the threshold drains back out. Sealant beads go where they hold water out, not where they trap it in — the bottom exterior edge should have a drainage path rather than a continuous bead. On an exposed entry, a wider overhang or a storm-side detail does more good than a premium door slab.
Hardware is the security layer, not the door
Most forced entries defeat the frame, not the panel. That means a deadbolt with a full one-inch throw, a reinforced strike plate, and screws long enough to reach the framing behind the jamb rather than biting only into thin jamb stock. Long screws in the top hinge help too. If there’s glass within reach of the interior thumbturn, consider that in your hardware choice before you consider the finish.
Glass, light and heat on an entry
Glazed doors, sidelights and transoms transform a dark entry and change its performance. Glass in and beside doors has to be safety glazing. Low-E coatings matter on a sun-facing entry, both for heat and for fading of the floor just inside. Between-the-glass blinds solve cleaning and privacy at once but add hardware that can fail. Decide privacy and glass pattern early; they’re factory options, not field changes.
Practical considerations
The door between the garage and the house
This one is governed by fire code, not preference. The opening between an attached garage and the living space has to be a rated assembly — commonly a twenty-minute fire-rated door or solid wood or steel of a specified minimum thickness — and current code requires it to be self-closing. No pet doors, no louvers, no undercut for airflow. Which code edition applies follows the address, so confirm with the authority that covers it before ordering a pretty replacement.
Telling seasonal swelling from structural racking
Run three checks before spending money. Does the gap around the door stay even, or is it wedge-shaped? Does the deadbolt miss the strike vertically, sideways or diagonally? Do interior doors elsewhere in the house also stick, and are there diagonal cracks above door and window corners? Even gaps and one sticky door in August points to humidity. Wedge gaps, diagonal misses and cracks across the house point to slab movement, which no new door will resolve.
Patio openings: sliders, French pairs and multi-slides
Big glazed openings behave differently from entry doors. Sliders live or die on track drainage and roller quality; a track that can’t drain will push water inside during a driving rain. French pairs need an astragal and solid flush bolts, because the inactive leaf is the weak point under wind pressure. Multi-slide and stacking systems need a structural header and precise sill installation. Threshold height is the trade-off between weather resistance and a flat walking surface.
Aging in place changes the threshold problem
A low or flush threshold, a clear opening wide enough for a walker or wheelchair, lever handles instead of knobs and a level landing outside all make a home usable for longer. The catch is that the lower the threshold, the harder it works to keep water out. That’s solvable with a proper pan, a drainage detail at the landing, a slight slope away from the door and a covered entry — but it has to be designed, not improvised at install.
At a glance
| Symptom | Usual cause | What it usually takes |
|---|---|---|
| Sticks in summer, frees up by winter | A wood door or jamb swelling with humidity | Plane and refinish, or move to a fiberglass slab |
| Even gap on top, wedge-shaped gap at the latch | The opening has racked with slab movement | Address the movement first; re-hanging alone won’t hold |
| Water on the floor after a driving rain | No sill pan, a worn sweep, or a threshold set too low | Pull the unit, pan the sill, reset and adjust |
| Soft dark wood at the bottom of the jamb | Splash-back wicking into end grain | Pre-hung replacement with composite jamb legs |
| Daylight at the hinge side and drafts in wind | Crushed weatherstrip or hinge screws pulling out | New weatherstrip and long screws into the framing |
| Deadbolt only throws if you lift the door | Hinge sag or a strike that has shifted | Reset hinges, relocate the strike, check for plumb |
Common questions
Fiberglass, steel or wood for a front door in this climate?
Fiberglass is the safest default here: it doesn’t swell with humidity, doesn’t rust, holds insulation well and takes a convincing wood-grain finish. Steel is strong and economical but dents permanently and can corrode at cut edges and along the bottom, which matters more the closer you are to the coast. Wood is the most beautiful and the most demanding — it really wants a deep covered entry and a maintenance schedule. Whatever the material, a sun-facing door in a dark color runs hot, so check the maker’s color and overhang requirements.
Can I keep my door and just replace the weatherstrip and threshold?
Often yes, and it’s the right first move when the slab is sound and the frame is still plumb. Adjustable thresholds can be raised to meet the door bottom, kerf-in weatherstrip is replaceable, and a new door sweep fixes a lot of daylight at the bottom. That whole repair costs a fraction of a replacement. It stops being the answer once the jamb legs are soft, the threshold is rotted underneath, or the frame itself has moved out of square.
Do I need a permit to replace an exterior door?
Like-for-like replacement in the same opening is usually the simplest case, while widening an opening, converting a window to a door or cutting a new opening is structural work with a header involved and typically needs a permit. Permit authority follows the address rather than the mailing city, and this region includes unincorporated areas and a township alongside municipalities. Separately, deed restrictions or HOA architectural review may govern front-door style and color even where no permit is required.
How much will a new exterior door change my energy bills?
Honestly, a single entry door is a small fraction of your exterior surface, so the direct savings are modest. Where it does matter is air leakage: a door with crushed weatherstrip and a gap at the bottom leaks continuously and pulls humid air in. Large glazed patio doors are the exception — they’re a big share of glass area, and an old aluminum slider with clear glass on a west wall is a genuine load. Prioritize the slider before the front door if you have to choose.
Should I do anything about patio doors before hurricane season?
Large glazed openings are the most vulnerable part of most homes, and there’s a building-science reason it matters: once an opening is breached, the house pressurizes internally and the load on the roof rises sharply. Options range from impact-rated glazing to approved shutters or panels. In designated coastal catastrophe-area counties, WPI-8 requirements apply and are verified per address, never assumed. Elsewhere it’s a risk decision rather than a code one. To walk through what your openings need, call (832) 513-5639.
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