Portsmouth Housing Action Plan (HAP)

Housing Policy
Reference Library

Interactive modules for Housing Committee members and partners. Each module explains a foundational concept in housing policy — with Portsmouth context, relevant law, and connections to the Housing Action Plan.

9 Modules
146 HAP Items
4 Topic areas
Show:
By-right Discretionary
Zoning & Regulation Module 01

By-Right vs. Discretionary Permitting

Why does the approval pathway determine whether housing gets built at all?

Approval process ZBA Developer behavior
Open module
MISSING MIDDLE
Zoning & Regulation Module 02

The Missing Middle: Housing Types Portsmouth Lacks

What housing types exist in Portsmouth's older neighborhoods but can't be built new — and why?

Housing types Zoning history Infill
Open module
Pre Post Apply Relief ends Full tax 79-E
Zoning & Regulation Module 03

RSA 79-E: Community Revitalization Tax Relief

How can temporary property tax relief unlock investment in older buildings and new housing?

Tax incentive Rehabilitation NH Housing
Open module
COST VALUE Feasible COST VALUE Gap → interactive
Economics Module 04

How a Development Pro Forma Works

What is the financial test every housing project must pass before it can be built?

Feasibility Construction costs Calculator
Open module
30% AMI $620/mo 50% $1,035/mo 60% $1,260/mo 80% $1,620/mo Market ~$2,250
Economics Module 05

What AMI Means in Portsmouth Dollars

When the HAP sets an affordability target, who does it actually reach in Portsmouth's market?

Income limits Market rents Workforce housing
Open module
✗ Mandatory inclusionary ✗ Linkage fees ✗ Transfer taxes ✓ Ground lease ✓ RSA 674:60 ✓ CLT ✓ Density bonus
Affordability Tools Module 06

Permanent Affordability: The Tools Available to Portsmouth

What's actually off the table under Dillon's Rule — and what tools does Portsmouth have?

Ground leases CLT Dillon's Rule
Open module
Foundation P-5, Z-8, PL-1 Z-2 ADUs by-right Z-26 Reduce CUPs by-right Z-6 Density bonus I-11 CLT partnership HTF-1 Fund
Implementation Module 07

Why Sequence Matters: Item Dependencies in the HAP

Which items are preconditions for others, and what does that mean for triage?

Sequencing Triage Dependency map
Open module
Debt 21% LIHTC 26% State 15% City 11% Grants 9% Equity 18% Cost $15M Rent covers only $1.5M gap →
Economics Module 08

How Affordable Housing Gets Financed

What is the capital stack, why does the operating gap exist, and what can Portsmouth actually do about it?

LIHTC Capital stack Operating gap
Open module
R/SRA SRB 85.8% GRA GRB GRC G1/G2 CD4/5 Jul 2026 SB 284 HB 577 ✓
Zoning & Regulation Module 09

Portsmouth Zoning: The Triage Reference

Zone structure, approval pathways, compliance deadlines, and all 38 Z-items grouped by mechanism — in one place.

38 Z-items Compliance flags Approval matrix
Open module

Suggested reading path

New to the Housing Action Plan? Start here.