The Lay of the Land
Current status of zoning in Naberth and the changes being proposed to 4a and 5b
The Lay of the Land: Narberth’s Zoning Districts
Narberth’s zoning map divides the borough into districts, each with its own character and rules. For the purposes of this guide, we’re focused on two: 5b and 4a. But it helps to understand where they sit in the overall hierarchy.
3a – Neighborhood Residential: The lowest-density areas. Bigger lots, bigger setbacks, single-family detached houses only. Think of the quieter streets with yards.
3b – Mixed Residential Limited: The largest district by area. Single-family homes plus twins (semi-detached houses that share a wall) and multifamily houses.
3c – Mixed Residential Open: A wider variety of housing types, including multifamily dwellings. Schools and civic buildings are found here too.
4a – General Urban Limited: A transition zone between downtown and the residential neighborhoods. Higher density than the 3-series districts. This is one of the two districts with proposed changes.
4b – General Urban Open: Dense residential with mixed-use buildings. Rowhouses dominate. Small front setbacks. Think of it as the densest residential district.
5a – Downtown: The small commercial core near the train station. Mixed-use structures with shops below and housing above.
5b – Montgomery Avenue: The commercial mixed-use corridor along Montgomery Ave. This is the other district with proposed changes.
There’s also a Historic District Overlay (H) that adds extra rules for properties containing historically significant structures, regardless of which underlying district they’re in.
What the Rules Say Now: District 5b (Montgomery Avenue)
The 5b district is the commercial spine of the borough — Montgomery Avenue, with its mix of shops, restaurants, and mixed-use buildings. Here’s what the current code allows:
What you can build: Mixed-use buildings (shops on the ground floor, apartments above) and commercial buildings are permitted by right. Apartment buildings are only allowed as a conditional use, and only on lots that contain a historically protected structure — a pretty narrow exception. Residential space in mixed-use buildings must be located above commercial space. The ground floor along Montgomery Ave must be commercial.
How tall: Buildings can be up to 45 feet, but are capped at 3 stories. This is worth pausing on: 45 feet is enough height for 4 stories. The code allows the physical envelope for 4 floors but only lets you use 3 of them.
How much of the lot you can cover: Up to 80% of the lot with buildings, and up to 90% with impervious surfaces (buildings, pavement, anything that isn’t soil or vegetation).
How close to the street: Buildings must be set back between 3.5 and 9.5 feet from the front lot line — quite close to the sidewalk, which is typical for a commercial corridor.
Parking: One parking space per residential unit, with some credits available for on-street parking depending on the block. Structured (multi-level) parking is allowed only by conditional use.
Lot sizes: Minimum 4,000 square feet for apartment, commercial, or mixed-use buildings. Minimum 40-foot lot width for those same building types.
What the Rules Say Now: District 4a (General Urban Limited)
The 4a district wraps around downtown and bridges the gap between the commercial core and the residential neighborhoods. It has a higher share of multi-unit dwellings than the 3-series districts but is still primarily residential in character.
What you can build: Detached houses, twin houses, and multifamily houses are all permitted by right. Apartment buildings are allowed only by conditional use — meaning a developer must go through a public hearing process with Borough Council. Rowhouses and cottages are not permitted at all in this district.
How tall: Maximum 35 feet and 3 stories. No exceptions, no bonuses — that’s the hard ceiling.
How much of the lot you can cover: About 50% of the first 6,000 square feet of lot area, plus 7% of any additional lot area, with buildings. Impervious coverage is capped at 60%. Both figures are notably lower than the 5a/5b commercial districts.
How close to the street: Buildings must sit at least 25 feet back from the front lot line — a substantial front yard. Compare this to 5b’s 3.5–9.5 feet.
Parking: One parking space per residential unit, with some reductions available. Apartment buildings must also provide visitor parking. Parking lot driveways must be one-way, which effectively means any parking lot needs two curb cuts (two driveways) — one for entering, one for exiting.
Lot sizes: 4,000 square feet minimum for detached houses, 3,000 for twin house halves, 3,000 per family for multifamily houses, and 8,000 for apartment buildings. Lot widths range from 25 feet (twins) to 80 feet (apartments). These minimums are larger than those in the denser 4b district.
What the Narberth Planning Commission Wants to Change: District 5b
The NPC has recommended several changes to the 5b district. These are policy changes — they alter what is actually permitted.
Allow housing on the ground floor (with a catch). Currently, the ground floor of mixed-use buildings along Montgomery Ave must be entirely commercial. The proposal would allow residential units on the ground floor, provided that the first 12 feet of building depth facing Montgomery Ave is still commercial space. Picture a shallow storefront or cafe space along the sidewalk, with a residential unit behind it. This responds to the reality that retail demand has shrunk — storefronts are smaller than they used to be, and mandating large commercial ground floors can leave space permanently vacant.
Allow 4 stories within the existing 45-foot height limit. The current code says buildings can be 45 feet tall but only 3 stories. The proposal removes the 3-story cap and allows 4 stories within the same 45-foot envelope. Nothing gets taller. The buildings would look the same from the outside. You’d simply fit an extra floor of housing inside the same box.
Create a 5th-story density bonus. Allow a 5th story (up to 55 feet) if the developer reserves 10% of all units in the building as affordable housing for households at 80% AMI or below. The 5th story would have to be set back an additional 10 feet from the front and rear facades — so it steps back from the street, reducing its visual impact.
Reduce parking minimums to 0.7 spaces per unit. The base parking requirement would drop from 1 space per unit to 0.7 spaces per unit, on the condition that the development participates in SEPTA’s residential pass program (which gives residents discounted transit passes). The maximum number of parking spaces a developer could build stays the same — this only changes the minimum. Affordable units would be exempt from parking requirements entirely. And required parking could be provided on other lots within 900 feet of the building, rather than on the building’s own lot.
What the Narberth Planning Commission Wants to Change: District 4a
The 4a proposals are more extensive, touching nearly every aspect of the district’s rules.
Allow new building types by right. Apartment buildings would be permitted by right on lots of sufficient size (currently they require conditional use). Rowhouses and cottages — currently not allowed at all in 4a — would both be allowed by right. All house types could contain at least two dwelling units plus an ADU. Multifamily houses could hold up to five units. A three-story detached house or twin could contain up to three units.
Reduce front setbacks. The front setback for houses would drop from 25 feet to 20 feet. Apartment buildings would need to be at least 10 feet from the sidewalk. Stories above the third floor would need to step back an additional 10 feet from any boundary with a less-dense zoning district.
Increase allowable lot coverage. Building coverage would go to 50% of lot area (up from the current sliding-scale formula). Impervious coverage would increase from 60% to 70%.
Create a 4th-story density bonus. Apartment buildings could add a 4th story (up to 45 feet — the current height limit is 35 feet) if 10% of units are reserved as affordable at 80% AMI, mirroring the 5b density bonus structure.
Reduce parking requirements. Same formula as 5b: 0.7 spaces per unit for apartments and multifamily houses, conditioned on SEPTA pass program participation. Affordable units and units under 750 square feet would be exempt from parking. The visitor parking requirement for apartments would be eliminated. Two-way driveways would be allowed (currently only one-way is permitted). Required parking could be provided on other lots within 900 feet.
Allow smaller lots. Minimum lot sizes and widths would be reduced to match the denser 4b district: 1,400 square feet for houses, 2,000 for multifamily. Minimum lot widths would be eliminated entirely for detached houses, cottages, rowhouses, and twins (side setback rules would still apply, effectively controlling how close buildings can be).
Why are the Changes Needed?
This is where we get a list of somewhat vague and weak arguments that are quite questionable to some of us. In a recent survey by the Borough, there is a clear setiment from participents that the changes are not that welcome. See an outline of the survey’s results here
So What Is the Recodification, Then?
Here’s where people get tripped up. The recodification is an entirely separate project from the 5b and 4a changes described above. They’re happening in parallel, they both involve Chapter 500 of the Borough Code, but they do fundamentally different things.
The recodification is a top-to-bottom reorganization of the entire zoning code. The borough’s own website describes it as a “policy-neutral amendment” — it doesn’t change any of the rules. What it does is clean up the document. Narberth’s form-based code was adopted in 2016 and has been amended more than 15 times since through individual ordinances. Each amendment was stitched into the existing text, creating cross-references that are hard to follow, tables with footnotes that modify their own values in non-obvious ways, and conditional use provisions scattered across multiple sections. If you’ve ever tried to read the current code and figure out what’s actually allowed on a given lot, you know the experience: you start in one section, get sent to a table, the table has a footnote, the footnote sends you to another section, and by the time you arrive you’ve forgotten what you were looking for.
The recodification reorganizes all of this into a structure that’s easier to navigate, read, and understand. Same rules, cleaner presentation. The Montgomery County Planning Commission has been helping prepare the rewrite.
The 5b and 4a zoning changes are substantive policy amendments. They change what can be built — new building types, different heights, new parking rules, density bonuses tied to affordability. These are the proposals that generated community debate at the February 2026 open house and the survey of over 300 residents.
To put it simply: the recodification is rewriting the instruction manual so you can actually follow it. The 5b/4a amendments are changing the instructions themselves.
Both projects modify the same document, which is why coordinating their timelines matters. Ideally, you’d integrate the new 5b/4a provisions into the reorganized code rather than bolting them onto the old structure and then reorganizing again. The Planning Commission discussed this sequencing challenge at its December 2025 meeting, with some commissioners noting that the borough solicitor’s drafting schedule could push the recodification’s advertisement into February 2026 or later.
A Quick Reference Card
This post draws on the Narberth Planning Commission’s February 2026 Recommendations for Zoning Changes, the Montgomery County Planning Commission’s April 2026 Summary of the Housing Affordability Open House and Survey, and the current Borough of Narberth Zoning Code (Chapter 500). The author is a Narberth resident, not a land-use attorney — this is a plain-language guide, not legal advice.