Carmel went from 1,442 residents in 1960 to 18,272 by 1980, 37,733 by 2000 and 99,757 by 2020, so the bulk of the housing is 1970s through 2000s — I-465 construction beginning in 1967 set it off, and the town incorporated as a city in 1976. Old Town Carmel and Home Place, an early-20th-century interurban-era settlement annexed by Carmel in 2018, carry 60-to-100-year canopy, while the 1990s and 2000s subdivisions are on a first generation of nursery trees now 25 to 35 years old and just reaching conflict size. That's the thing that decides what a norway spruce here is likely to be — a mature specimen over a roofline, or nursery stock still establishing. Removing a norway spruce around Carmel runs roughly $400–$1,900, and in Village of WestClay, Brookshire and Woodland Springs access is usually what decides where in that range you land.
What's actually growing in Carmel
Carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it.
Carmel's housing stock, and what it means for tree size
Carmel went from 1,442 residents in 1960 to 18,272 by 1980, 37,733 by 2000 and 99,757 by 2020, so the bulk of the housing is 1970s through 2000s — I-465 construction beginning in 1967 set it off, and the town incorporated as a city in 1976. Old Town Carmel and Home Place, an early-20th-century interurban-era settlement annexed by Carmel in 2018, carry 60-to-100-year canopy, while the 1990s and 2000s subdivisions are on a first generation of nursery trees now 25 to 35 years old and just reaching conflict size.
What's specific to norway spruce
Two patterns matter here: small branch tips browning and dying back inward, which Purdue has been seeing more of in submitted samples, and Cytospora canker, which is the real killer of 10-20 year old trees. Cytospora is diagnosable on site — the lowest branches die first and it climbs, with white to bluish resin crusted on the bark at the canker; a tree that is merely thin and off-color with no resin bleeding is stressed, one with dead lower whorls and resin streaks is being dismantled limb by limb.
Hamilton County rules
Carmel's code section 6-64 is titled "Planting and Removal of Trees and Shrub Regulations" and sits in the streets-and-sidewalks division of Chapter 6, alongside 6-55 covering trees and shrubs that obstruct streets and sidewalks — so the city's active regulation is aimed at the public way, plus landscape and buffer plantings approved through development plan review by Urban Forestry. I could not verify the exact text of 6-64 or confirm whether any permit applies to removing a tree standing entirely in a private back yard; contact Carmel Urban Forestry through the city's Department of Community Services before assuming, and check HOA covenants, which in most Carmel subdivisions are stricter than the city.