Choosing a custom iron entry door for new construction involves much more than selecting a design and providing a width and height. Because custom iron doors are manufactured specifically for each project, the opening dimensions, wall thickness, door swing, glass, sidelights, transoms, hardware, finish, and installation conditions all need to be coordinated before production begins.
For architects, builders, designers, and homeowners, accurate specifications help ensure that a new construction iron door fits the framed opening correctly, works with the wall system, and delivers the appearance and performance expected from a custom entrance.
This guide explains the key information typically required when specifying a custom iron entry door for a new construction project.
1. Start With the Architectural Door Opening
Most new construction iron door projects begin with architectural plans.
The floor plan and exterior elevation typically identify the main entry opening and provide preliminary dimensions. On larger projects, each door may also have a reference number that corresponds with a door schedule.
The architectural drawings may indicate:
- Door location
- Approximate width and height
- Single or double door configuration
- Sidelights
- Transoms
- Door swing
- Exterior elevation
- Finished floor height
- Wall construction
These drawings provide a starting point, but custom iron doors should not normally be manufactured from preliminary architectural dimensions alone.
Before production, the final door dimensions and installation conditions should be carefully confirmed.
2. Confirm the Rough Opening
One of the most important measurements for a new construction entry door is the rough opening.
The rough opening is the framed structural opening prepared for the complete door system.
It is different from the actual manufactured door unit size.
A typical opening must provide enough installation clearance for:
- Positioning
- Leveling
- Shimming
- Anchoring
- Insulation
- Perimeter sealing
- Waterproofing
The exact required clearance depends on the door construction and installation method.
For a custom iron entry door, the manufacturer should confirm the required rough opening before framing is finalized whenever possible.
Why Rough Opening Accuracy Matters
If the rough opening is too small, the frame may not fit.
If it is excessively large, the installer may have difficulty properly securing, insulating, and finishing the opening.
Accurate rough opening dimensions are therefore essential for both manufacturing and installation.
3. Determine the Overall Iron Door Size
After the rough opening is established, the final overall door unit size can be determined.
This usually includes the complete frame rather than only the movable door slab.
For example, a custom iron entry system may include:
- One operable door
- Double doors
- One or two sidelights
- A transom
- Decorative ironwork
- Fixed glass panels
The total frame dimensions should be clearly shown on the approved shop drawings.
For oversized or highly customized entrances, every component should be dimensioned separately.
4. Choose a Single or Double Iron Entry Door
The overall entrance design determines whether the project uses a single iron entry door or double iron entry doors.
Single Iron Entry Doors
Single doors work well for standard residential entrances and can still create a substantial architectural appearance when combined with a tall frame, decorative glass, or sidelights.
Double Iron Entry Doors
Double front doors are commonly used for larger luxury homes and wide entry openings.
When specifying double doors, it is important to determine:
- Which panel is active
- Which panel is inactive
- How the inactive panel locks
- Handle placement
- Door swing
- Center meeting stile configuration
The final configuration should be established before manufacturing.
5. Specify Door Handing and Swing Direction
Door handing is a critical part of custom iron door specifications.
The door must be manufactured according to the intended opening direction.
The project should clearly identify:
- Left-hand or right-hand operation
- Inswing or outswing
- Active leaf on double doors
- Interior side
- Exterior side
- Handle location
Door swing should also be coordinated with:
- Interior walls
- Furniture
- Light switches
- Stairs
- Hallways
- Exterior landings
Incorrect door handing can create major installation problems, so it should always be confirmed on the final shop drawing.
6. Confirm Jamb Depth and Finished Wall Thickness
For custom iron entry doors, jamb depth is just as important as width and height.
Jamb depth determines how the door frame fits through the thickness of the finished wall.
New construction wall assemblies can vary significantly and may include:
- Wood framing
- Sheathing
- Exterior insulation
- Brick veneer
- Stone veneer
- Stucco
- Siding
- Interior drywall
- Masonry
- Concrete
The correct jamb depth should be based on the finished wall assembly rather than only the structural framing.
If the jamb is too shallow or too deep, the door may not align correctly with the interior and exterior wall finishes.
This is especially important for custom homes with thick stone, brick, or masonry walls.
7. Decide Whether the Door Needs Sidelights or a Transom
Many custom iron entry doors for new construction include additional glass around the door.
Common configurations include:
- Single door with one sidelight
- Single door with two sidelights
- Double doors with sidelights
- Door with transom
- Door with sidelights and transom
Iron Door Sidelights
Sidelights can make an entrance feel wider and bring additional daylight into the foyer.
Their width, glass design, iron pattern, and proportions should coordinate with the main door.
Iron Door Transoms
A transom is installed above the door and is often used in tall entryways.
Transoms may be:
- Rectangular
- Arched
- Eyebrow-shaped
- Custom-shaped
Because sidelights and transoms affect the total size of the door system, they should be included in the original specification rather than added late in the process.
8. Select the Iron Door Top Design
The top shape has a major influence on the architectural character of an iron entry door.
Common options include:
- Square top
- Full arch
- Eyebrow arch
- Segment arch
- Custom architectural shapes
The door top design should coordinate with the surrounding opening and exterior architecture.
If an arched opening is involved, precise measurements are especially important because the frame must follow the intended geometry.
For new construction, it is generally easier to coordinate the framed opening and custom door together before the wall finishes are completed.
9. Select Glass for the Custom Iron Door
Glass is a major design and performance component of many iron entry doors.
Common options include:
- Clear glass
- Low-E glass
- Tempered glass
- Laminated glass
- Frosted glass
- Reeded glass
- Rain glass
- Tinted glass
- Decorative glass
- Insulated glass
The right glass depends on the desired balance between:
- Privacy
- Natural light
- Energy performance
- Safety
- Exterior appearance
For exterior applications, insulated glass is often selected to improve thermal performance.
Safety glazing requirements should also be reviewed according to the applicable building code.
10. Consider Energy Efficiency and Thermal Performance
Modern iron entry doors for new construction should be considered as part of the building envelope.
Depending on the climate and local code requirements, important thermal-performance features may include:
- Insulated glass units
- Low-E coatings
- Weatherstripping
- Insulated door construction
- Sealed frame connections
- Thermal breaks
- Proper threshold sealing
Metal is naturally conductive, so the construction of the complete door system matters.
A properly designed and installed iron door should control air infiltration and water penetration while supporting the project's overall energy-efficiency goals.
11. Choose the Iron Door Finish
The finish has both an aesthetic and protective function.
Popular custom iron door finishes may include:
- Matte black
- Charcoal
- Bronze
- Dark brown
- Antique finishes
- Custom powder-coated colors
The finish should complement other exterior elements such as:
- Windows
- Roofing
- Exterior lighting
- Garage doors
- Railings
- Stone
- Brick
- Stucco
For exterior iron doors, proper surface preparation and coating are important for long-term durability and corrosion resistance.
12. Specify Handles, Locks, and Hardware
Hardware should be coordinated before the iron door enters production.
Possible hardware selections include:
- Modern pull handles
- Traditional handles
- Entry locksets
- Deadbolts
- Multi-point locking systems
- Smart locks
- Hinges
- Flush bolts for double doors
- Door closers
For custom doors, the manufacturer may need to prepare the door specifically for the selected hardware.
Changes made after fabrication may be more difficult than specifying the hardware correctly from the beginning.
13. Review the Threshold and Exterior Landing
The bottom of the door is one of the most important areas for water control and installation.
The project should consider:
- Threshold height
- Finished interior floor
- Exterior landing height
- Drainage direction
- Waterproofing
- Weather seals
- Accessibility requirements
The surrounding exterior surface should allow water to move away from the entrance.
For exposed entry doors, overhangs, porches, and drainage design can also help protect the door system from direct weather exposure.
14. Consider Wind, Water, and Local Building Requirements
Not every custom iron door has the same performance requirements.
Projects in different parts of the United States may be exposed to very different conditions.
For example, a new construction project may need to consider:
- Wind pressure
- Water penetration
- Coastal environments
- Salt exposure
- Impact requirements
- Energy codes
- Safety glazing
- Egress requirements
- Fire-rating requirements
Homes in coastal or high-wind areas may require additional engineering or approved door systems.
The architect, contractor, engineer, or local building authority should confirm the requirements that apply to the specific project location.
15. Coordinate the Iron Door With the Wall System
A custom entry door must work with the complete wall assembly.
The installation details should coordinate:
- Structural framing
- Exterior sheathing
- Weather-resistant barrier
- Flashing
- Exterior cladding
- Insulation
- Interior finishes
- Perimeter sealant
Good installation planning helps reduce the risk of:
- Water intrusion
- Air leakage
- Uneven installation
- Improper frame alignment
- Cracking around the opening
This coordination is particularly important with heavy custom iron doors because the surrounding structure must provide proper support.
16. Review Shop Drawings Before Production
Before a custom iron entry door is manufactured, the customer, builder, designer, or architect should review the shop drawings carefully.
Shop drawings may show:
- Overall width
- Overall height
- Rough opening
- Jamb depth
- Door swing
- Door handing
- Active and inactive panels
- Glass configuration
- Sidelight dimensions
- Transom dimensions
- Iron pattern
- Handle preparation
- Lock preparation
- Threshold details
- Finish selection
This review process is one of the most important stages of ordering a custom iron door.
Once the dimensions and design are approved and manufacturing begins, major changes may become difficult or costly.
What Information Do You Need to Order a Custom Iron Entry Door for New Construction?
Before requesting a final quote or approving production, it is helpful to confirm:
- Rough opening width
- Rough opening height
- Finished wall thickness
- Jamb depth
- Single or double door configuration
- Door handing
- Inswing or outswing
- Sidelights
- Transom
- Top design
- Glass type
- Iron pattern
- Finish
- Handle style
- Lock system
- Threshold requirements
- Local performance requirements
- Installation conditions
Providing complete information early makes it easier to move from architectural design to shop drawings and final production.
When Should You Order Custom Iron Doors for New Construction?
Custom iron doors should be planned early in the construction process.
Unlike stock doors, custom doors require time for:
- Design confirmation
- Measurements
- Shop drawings
- Material preparation
- Fabrication
- Finishing
- Quality inspection
- Shipping
Ordering early also gives the builder time to coordinate the rough opening, wall thickness, flooring, exterior finishes, and installation schedule around the finished door system.
Waiting until the entrance is completely finished can limit design options and increase the risk of dimensional conflicts.
Final Thoughts
Specifying a custom iron entry door for new construction requires coordination between design, manufacturing, framing, and installation.
The most important details include the rough opening, overall door size, jamb depth, door handing, swing direction, wall thickness, glass, sidelights, transoms, hardware, finish, and installation conditions.
When these specifications are confirmed before manufacturing, the result is a door system that fits the architecture, installs correctly, and becomes a lasting focal point of the home.
For new homes, luxury residences, and custom architectural projects, planning the iron entry door early makes it easier to achieve the right proportions, design, and performance from the beginning.
Plan Your Custom Iron Door
Review our custom iron door process, then share your opening dimensions and design requirements with our team.
